Huace Navigation Technology A02003 GNSS Receiver User Manual SY4 A02003 User Manual Rev2

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SafetyInformation

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il

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CHC®N72™GNSSReference

Receiver



Revision1.0

January2015

N72GNSSReferenceReceiverUserGuidePage1

NavigationTechnologyLtd.Allrightsreserved.The

CHCaretrademarkofShanghaiHuaCeNavigation

TechnologyLimited.Allothertrademarksarethe

propertyoftheirrespectiveowners.



Trademarks

Allproductandbrandnamesmentionedinthis

publicationaretrademarksoftheirrespective

holders.



SafetyWarnings

TheGlobalPositioningSystem(GPS)isoperatedby

theU.S.Government,whichissolelyresponsible

fortheaccuracyandmaintenanceoftheGPS

network.Accuracycanalsobeaffectedbypoor

satellitegeometryandobstructions,likebuildings

andheavycanopy.



FCCinterferencestatement

Thisequipmenthasbeendesignedtocomplywith

thelimitsforaClassBdigitaldevice,pursuantto

part15oftheFCCRulesinthePortableMode.

Theselimitsaredesignedtoprovidereasonable

protectionagainstharmfulinterferenceina

residentialinstallation.



Operationissubjecttothefollowingtwo

conditions:(1)thisdevicemaynotcauseharmful

interferenceand(2)thisdevicemustacceptany

interferencereceived,includinginterferencethat

maycauseundesiredoperation.



Note:

THEGRANTEEISNOTRESPONSIBLEFORANY

CHANGESORMODIFICATIONSNOTEXPRESSLY

APPROVEDBYTHEPARTYRESPONSIBLEFOR

COMPLIANCE.SUCHMODIFICATIONSCOULDVOID

THEUSER’SAUTHORITYTOOPERATETHE

EQUIPMENT

Thisproducthasbeentestedandfoundtocomply

withthelimitsforPart15oftheFCCRules.These

limitsaredesignedtoprovidereasonable

protectionagainstharmfulinterferenceina

residentialinstallation.Thisproductgenerates,

uses,andcanradiateradiofrequencyenergyand,

ifnotinstalledandusedinaccordancewiththe

instructions,maycauseharmfulinterferenceto

radiocommunications.However,thereisno

guaranteethatinterferencewillnotoccurina

particularinstallation.Ifthisproductdoescause

harmfulinterferencetoradioortelevision

reception,whichcanbedeterminedbyturningthe

equipmentoffandon,theuserisencouragedto

trytocorrecttheinterferencebyoneormoreof

thefollowingmeasures:

—Reorientorrelocatethereceivingantenna.

—Increasetheseparationbetweentheequipment

andreceiver.

—Connecttheequipmentintoanoutletona

circuitdifferentfromthattowhichthereceiveris

connected.

—Consultthedealeroranexperiencedradio/TV

technicianforhelp.



N72GNSSReferenceReceiverUserGuide–

Revision1.0January2015



N72GNSSReferenceReceiverUserGuidePage2

SAFETYINFORMATION

BeforeyouuseyourCHC®N72™GNSSreferencereceiver,makesurethat

youhavereadandunderstoodallsafetyrequirements.

REGULATIONSANDSAFETY

Thereceivercontainsaninternalwirelessmodemforcommunicatingsignals

throughBluetooth®wirelesstechnologyorthroughanexternaldata

communicationsradio.Regulationsregardingtheuseofthewirelessmodem

varygreatlyfromcountrytocountry.Insomecountries,theunitcanbeused

withoutobtaininganend‐userlicense.Othercountriesrequireend‐user

licensing.Forlicensinginformation,consultyourlocalCHCdealer.

BeforeoperatingaN72GNSSreferencereceiver,determineifauthorization

oralicensetooperatetheunitisrequiredinyourcountry.Itisthe

responsibilityoftheend‐usertoobtainanoperator'spermitorlicensefor

thereceiverforthelocationorcountryofuse.

TYPEAPPROVAL

Typeapproval,oracceptance,coverstechnicalparametersoftheequipment

relatedtoemissionsthatcancauseinterference.Typeapprovalisgrantedto

themanufacturerofthetransmissionequipment,independentfromthe

operationorlicensingoftheunits.Somecountrieshaveuniquetechnical

requirementsforoperationinparticularradiomodemfrequencybands.To

complywiththoserequirements,CHCmayhavemodifiedyourequipmentto

begrantedTypeapproval.Unauthorizedmodificationoftheunitsvoidsthe

Typeapproval,thewarranty,andtheoperationallicenseoftheequipment.

EXPOSURETORADIOFREQUENCYRADIATION

Safety.ExposuretoRFenergyisanimportantsafetyconsideration.TheFCC

hasadoptedasafetystandardforhumanexposuretoradiofrequency

electromagneticenergyemittedbyFCCregulatedequipment.Properuseof

thisradiomodemresultsinexposurebelowgovernmentlimits.The

followingprecautionsarerecommended:

 Donotoperatethetransmitterwhensomeoneis20cm(7.8inches)of

theantenna.

 DonotoperatethetransmitterunlessallRFconnectorsaresecureand

anyopenconnectorsarecorrectlyterminated.

 Donotoperatetheequipmentnearelectricalblastingcapsorinan

SafetyInformation

N72GNSSReferenceReceiverUserGuidePage3

explosiveatmosphere.

 Allequipmentmustbecorrectlygroundedforsafeoperation.

 Allequipmentshouldbeservicedonlybyaqualifiedtechnician.

BATTERYSAFETY

WARNING–DonotdamagetherechargeableLithium‐ionbattery.A

damagedbatterycancauseanexplosionorfire,andcanresultinpersonal

injuryand/orpropertydamage.Topreventinjuryordamage:

– Donotuseorchargethebatteryifitappearstobedamaged.Signs

ofdamageinclude,butarenotlimitedto,discoloration,warping,

andleakingbatteryfluid.

– Donotexposethebatterytofire,hightemperature,ordirect

sunlight.

– Donotimmersethebatteryinwater.

– Donotuseorstorethebatteryinsideavehicleduringhotweather.

– Donotdroporpuncturethebattery.

– Donotopenthebatteryorshort‐circuititscontacts.

WARNING–AvoidcontactwiththerechargeableLithium‐ionbatteryifit

appearstobeleaking.Batteryfluidiscorrosive,andcontactwithitcanresult

inpersonalinjuryand/orpropertydamage.Topreventinjuryordamage:

– Ifthebatteryleaks,avoidcontactwiththebatteryfluid.

– Ifbatteryfluidgetsintoyoureyes,immediatelyrinseyoureyeswith

cleanwaterandseekmedicalattention.Donotrubyoureyes!

– Ifbatteryfluidgetsontoyourskinorclothing,immediatelyuse

cleanwatertowashoffthebatteryfluid.

WARNING–ChargeandusetherechargeableLithium‐ionbatteryonlyin

strictaccordancewiththeinstructions.Chargingorusingthebatteryin

unauthorizedequipmentcancauseanexplosionorfire,andcanresultin

personalinjuryand/orequipmentdamage.Topreventinjuryordamage:

– Donotchargeorusethebatteryifitappearstobedamagedor

leaking.

– ChargetheLithium‐ionbatteryonlyinaCHCproductthatis

specifiedtochargeit.

– Discontinuechargingabatterythatgivesoffextremeheatora

burningodor.

– UsethebatteryonlyinCHCequipmentthatisspecifiedtouseit.

– Usethebatteryonlyforitsintendeduseandaccordingtothe

instructionsintheproductdocumentation.

SafetyInformation

N72GNSSReferenceReceiverUserGuidePage4

DCPOWERSUPPLYSAFETY

WARNING–WhenDCvoltageisappliedtothisreceiverthroughCOM1or

COM2(Lemoconnectors),theDCvoltagemustbelimitedtonomorethan

36VDC+0%underbothnormalandsinglefaultconditions.Ifthe

recommendedinputvoltageisexceeded,thereceivermaypresentan

electricalhazard.

WETLOCATIONSAFETY

WARNING–Thisreceiverisnotintendedtobeusedinawetlocation,ora

locationthatmaybecomewet,whenitispoweredbytheexternalDCpower

supply.Usethereceiverinawetlocationonlywhenoperatingitonitsown

internalbattery.

WARNING–Theexternalpoweradapteranditsassociatedpowercordand

plugarenotintendedtobeinstalledoutdoors,orinawetlocation.

WARNING–Donotpowerthereceiverthroughexternalpowerwhen

operatinginawetenvironmentoranenvironmentthatmaybecomewet.

Thepowerinputconnectionsmustbesheltered.



N72GNSSReferenceReceiverUserGuidePage5

CONTENTS

SafetyInformation...........................................................................................................................................2

Regulationsandsafety.............................................................................................................................2

Typeapproval..........................................................................................................................................2

Exposuretoradiofrequencyradiation....................................................................................................2

Batterysafety...........................................................................................................................................3

DCpowersupplysafety...........................................................................................................................4

Wetlocationsafety..................................................................................................................................4

1.Introduction.................................................................................................................................................7

1.1.Aboutthereceiver............................................................................................................................7

1.2.Technicalsupport..............................................................................................................................7

1.3.Disclaimer.........................................................................................................................................8

1.4.Yourcomments.................................................................................................................................8

2.Overview......................................................................................................................................................9

2.1.Receiverframework..........................................................................................................................9

2.1.1.Thenetworkapplianceconcept..........................................................................................10

2.2.Receiverservices.............................................................................................................................10

2.3.Receiverfeatures............................................................................................................................11

2.4.Useandcare...................................................................................................................................11

2.5.Electronicinterface.........................................................................................................................12

2.6.Keypadanddisplay.........................................................................................................................12

2.7.Rearconnectors..............................................................................................................................13

3.BatteriesandPower..................................................................................................................................15

3.1.Externalpower................................................................................................................................15

3.2.Batterysafety..................................................................................................................................16

3.3.Batteryperformance......................................................................................................................16

3.4.Chargingthebattery.......................................................................................................................17

3.5.Storingthebattery..........................................................................................................................17

3.6.Removingthebattery.....................................................................................................................17

4.SettingUptheReceiver.............................................................................................................................19

4.1.Guidelines.......................................................................................................................................19

4.1.1.Environmentalconditions....................................................................................................19

4.1.2.Sourcesofelectricalinterference........................................................................................19

4.1.3.Uninterruptablepowersupply.............................................................................................19

4.1.4.Lightingandsurgeprotection..............................................................................................20

4.1.5.Placingtheantenna.............................................................................................................20

4.2.Systeminstallation..........................................................................................................................21

4.2.1.Supportedantenna..............................................................................................................21

4.2.2.Systeminstallationdiagram.................................................................................................21

5.ConfiguringtheReceiver:KeypadandDisplay..........................................................................................23

5.1.Buttonfunctions.............................................................................................................................23

5.2.Homescreen...................................................................................................................................23

5.3.Statusscreens.................................................................................................................................24

N72GNSSReferenceReceiverUserGuidePage6

5.4.SettingupthereceiveraspartofanEthernetconfiguration.........................................................25

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay.......................................................................26

6.1.ConfiguringtheEthernetsettings...................................................................................................26

6.2.Configuringthroughawebbrowser...............................................................................................27

6.2.1.Changingthesettings..........................................................................................................28

6.2.1.1.Statusmenu..............................................................................................................28

6.2.1.2.Satellitesmenu.........................................................................................................31

6.2.1.3.ReceiverSettingsmenu............................................................................................33

6.2.1.4.DataRecordingmenu...............................................................................................36

6.2.1.5.IOSettingsmenu.......................................................................................................40

6.2.1.6.GPRSmenu...............................................................................................................44

6.2.1.7.Radiomenu...............................................................................................................44

6.2.1.8.WANmenu................................................................................................................45

6.2.1.9.Wifimenu.................................................................................................................47

6.2.1.10.BluetoothSetmenu................................................................................................48

6.2.1.11.NetworkServicemenu...........................................................................................48

6.2.1.12.Firmwaremenu....................................................................................................497

7.DefaultSettingandConfigurationFiles.....................................................................................................50

7.1.Defaultreceiversettings.................................................................................................................50

7.1.1.Resettingthereceivertofactorydefaults............................................................................50

7.1.2.Usingconfigurationfilestoduplicatereceiversettings.......................................................53

8.Specifications.............................................................................................................................................54

8.1.GNSScharacteristics.......................................................................................................................54

8.2.Communication..............................................................................................................................54

8.3.Physical...........................................................................................................................................55

8.4.Electrical.........................................................................................................................................55

8.5.General...........................................................................................................................................55

8.6.Datastorage....................................................................................................................................56

A.UpgradingtheReceiverFirmware.............................................................................................................57

A.I.TheWinFlashutility.........................................................................................................................57

A.I.i.InstallingtheWinFlashutility................................................................................................57

A.II.Upgradingthereceiverfirmware...................................................................................................57

A.II.i.UpgradingthroughUSBport................................................................................................57

A.II.ii.Upgradingthroughabrowser..............................................................................................58

B.Troubleshooting.........................................................................................................................................59

B.I.Receiverissues.................................................................................................................................59

C.CommunicationPortsDefinition...............................................................................................................61

C.I.CHCN72ReceiverCOM1(10‐PINLEMOPort)Definition...............................................................61

C.II.CHCN72ReceiverCOM2(10‐PINLEMOPort)Definition..............................................................61

C.III.CHCN72ReceiverDB9MaleConnectorDefinition.......................................................................62

D.Glossary.....................................................................................................................................................63

N72GNSSReferenceReceiverUserGuidePage7

1. INTRODUCTION

TheN72GNSSReferenceReceiverUserGuidedescribeshowtosetupand

usetheCHC®N72™GNSSreferencereceiver.

Inthismanual,“thereceiver”referstotheN72GNSSreferencereceiver

unlessotherwisestated.

EvenifyouhaveusedotherGlobalNavigationSatelliteSystems(GNSS)

productsbefore,CHCrecommendsthatyouspendsometimereadingthis

manualtolearnaboutthespecialfeaturesofthisproduct.Ifyouarenot

familiarwithGNSS,gotowww.chcnav.comforaninteractivelookatCHC

andGNSS.

1.1. ABOUTTHERECEIVER

TheN72GNSSreferencereceiver(“thereceiver”)isamultiple‐frequency

GNSSreceiver.ItcantrackallGPS(L1/L2/L5),GLONASS(L1/L2)andBDS

(B1/B2)signals.

Youcanusethefrontpanelofthereceiveroranofficecomputerto

configurethereceiver,accessfiles,andpublishdatafilestoacompany

IntranetortotheInternet.Thereceivermakesiteasyforyoutosetupa

powerful,flexible,andreliablereferencestationforcontinuousoperation.

Thereceiverservesinallcommongeodeticreferencereceiverroles.Itcan

bethemaincomponentinaContinuouslyOperatingReferenceStation

(CORS),streamingdatatoCHCGNSSInfrastructuresoftware.Itcanalsowork

wellasacampaignreceiverpriortopermanentdeployment.Thereceiver

makesanexcellentportableRTKbasestationwithitsinternalbattery.Italso

hasspecializedcapabilitiesthatmakeitanexcellentreferencereceiverfor

scientificapplications.

1.2. TECHNICALSUPPORT

Ifyouhaveaproblemandcannotfindtheinformationyouneedinthe

productdocumentationorCHCwebsite(www.chcnav.com),contactyour

localCHCdealerfromwhichyoupurchasedthereceiver(s).

IfyouneedtocontactCHCtechnicalsupport,pleasecontactusbyemail

(support@chcnav.com)orSkype(chc_support).



1.Introduction

N72GNSSReferenceReceiverUserGuidePage8

1.3. DISCLAIMER

Beforeusingthereceiver,pleasemakesurethatyouhavereadand

understoodthisUserGuide,aswellasthesafetyrequirements.CHCholds

noresponsibilityforthewrongoperationbyusersandforthelosses

incurredbythewrongunderstandingaboutthisUserGuide.However,CHC

reservestherightstoupdateandoptimizethecontentsinthisguide

regularly.PleasecontactyourlocalCHCdealerfornewinformation.

1.4. YOURCOMMENTS

Yourfeedbackaboutthisuserguidewillhelpustoimproveitinfuture

revision.Pleaseemailyourcommentstosupport@chcnav.com.



N72GNSSReferenceReceiverUserGuidePage9

2. OVERVIEW

ThischapterintroducestheN72GNSSreferencereceiver(“thereceiver”).

ThisreceivermakesiteasytosetupapowerfulandreliableContinuously

OperatingReferenceStation(CORS)ortocollectdatafromtemporaryfield

locations.

Thereceiverisidealforthefollowinginfrastructureapplications:

 AspartofaGNSSInfrastructurenetworkinconjunctionwithCHC

ReferenceStationNetwork(CRNet)software.

 Aspartofapermanentreferencestationwithorwithoutsupporting

software.

 AtemporaryfieldbasestationtobroadcastRTKcorrectionsandcollect

observationsforpostprocessing.

2.1. RECEIVERFRAMEWORK

Thereceiverintegratesthemulti‐frequencyGNSStechnologyintoa

specializedprocessingandcommunicationsframework.Thereceivercan

operateasastandalonereferencestationoritcanbeintegratedintoa

scalablenetwork.

WithanInternetProtocol(IP)astheprimarycommunicationsmethod,you

canusepublicdomaintools,suchasawebbrowserandFTPclient,to

configurethereceiverandaccessloggeddatafiles.

NOTE‐AllreferencestotheInternetrefertoeitheraWideArea

Network(WAN)oraLocalAreaNetwork(LAN)connection.

Thereceiveradoptsasecuredsystemthatrequiresapasswordprotected

Usethenetworkmanagementfeaturestocreateabase/roverconfiguration

withavarietyofoperatingmodes.Youcanthenenablethosemodesas

necessaryinsteadofswitchingtheglobalstateofthereceiverfromone

modetoanother.Forexample,youcanconfigureanumberofstreaming

serviceswithdifferentconfigurations(suchasanycombinationofdata

stream,sampleinterval)ondifferentTCPorUDPports.Toactivateoneor

moremodes,opentheconnectiontothespecificport.Thisallowsmultiple

clientstoaccessanygivenstreamingservice.

Thesefeaturesandmanymore,shiftthemodelofaGNSSreceivertoward

theconceptofa"networkappliance".

2.Overview

N72GNSSReferenceReceiverUserGuidePage10

2.1.1. THENETWORKAPPLIANCECONCEPT

Traditionally,aGNSSreceiverhasoneoperator.Thatpersonistheonlyuser

ofthereceiversotheycanchangesettingswithoutaffectingotherusers.

WiththeN72GNSSreferencereceiver,anoperatorcanconfigureareceiver

once,andthenmakeitavailableasanetworkapplianceforgeneraluseby

oneormoreusers(orclients).

Thisnetworkapplianceconceptletsyousetupthereceivertoprovideone

ormoreservicesthatoneormoreuserscanaccessthroughaLocalArea

Network(LAN)oraWideAreaNetwork(WAN),suchastheInternet.Once

thereceiverissetup,youneedmakeonlyminimalchanges,ifany,tothe

receiverconfiguration.

Whenthereceiverisoperatingasanetworkappliance,itprovidesservices

toallusersattachedtothereceiverthroughthenetwork.

Differentstreamedservicesmaybeconfiguredondifferentports,for

example,withdifferingdataratesordatacombination.Toobtainaservice,

theclienthasonlytoconnecttoaspecificport.Inthisway,mostusersdo

notneedtocontrolthereceiver.Changingglobalsettings,suchasmasks,will

affectallusersofallservices.

Thereceiverprovidesthefollowingstandardconfigurationanddatalogging

services:

Use... Toperform...

HTTP Allmanualandautomatedconfigurationoperationstomanage

theloggeddatafilespace.

FTPRemotemanualand/orautomatedoperationstomanagethe

loggeddatafileuploadpath.

2.2. RECEIVERSERVICES

Thereceivercanprovideoneormorestreamingorqueryservicesovera

RS‐232serialportoraTCP/IPport:

 Streamingservice

Anyonewithauthorizedaccesscanobtainstreamedinformation,such

asGNSSmeasurementsorRTCMcorrections,withouthavingtocontrol

orissuecommandstothereceiver.Theclientsimplyconnectstothe

portthatisstreamingtherequiredinformation.

2.Overview

N72GNSSReferenceReceiverUserGuidePage11

2.3. RECEIVERFEATURES

 220‐channels

– GPS:L1C/A,L2C,L2E,L5

– GLONASS:L1C/A,L1,L2C/A,L2P

– Galileo:E1,E5A,E5B

– SBAS:WAAS,EGNOS,MSAS

– BDS:B1,B2

 16GBinternaldataloggingstorage

 ExternalUSBdrivesupport

 Integratedbattery,providesupto17hoursoperation

 Integrateddisplayandkeypadforsystemconfigurationwithouta

controller

 IntegratedBluetoothwirelesstechnologyforcable‐freedata

transmission

 Permanent/semi‐permanentandmobilequicksetupbasestation

capability

 Easy‐to‐useWeb‐interfacemenusystemforrapidconfigurationand

statuschecking

 Rugged,weatherproofconstructionwithanIP67environmentalrating

 ‐40°Cto+65°C(‐40°Fto+149°F)operatingtemperaturerange

 12Vto36VDCinputpowerrange

 DatafilegeneratedinHCN

 IMX287processorbasedonembeddedLinux,mainfrequencyupto

450MHz

 Eightindependentdataloggingsessionswithconfigurablememory

pooling

 Circulatingdataloggingmethod

 FTPpushtoallowuploadingofloggeddatafilestoremotesites

 Ethernetconfigurationthroughthefrontpanel

 MultiplelanguagesavailablethroughtheWebinterface

 NTRIP(NetworkedTransportofRTCMviaInternetProtocol)

client/server/castersupport

2.4. USEANDCARE

Thisreceivercanwithstandtheroughtreatmentandtoughenvironment

thattypicallyoccursinCORSinstallation.However,itisahigh‐precision

electronicinstrumentandshouldbetreatedwithreasonablecare.

CAUTION–Operatingorstoringthereceiveroutsidethespecified

temperaturerangecandamageit.Formoreinformation,seeChapter8

Specifications.

2.Overview

N72GNSSReferenceReceiverUserGuidePage12

2.5. ELECTRONICINTERFACE

High‐powersignalsfromanearbyradioorradartransmittercanoverwhelm

thereceivercircuits.Thisdoesnotharmtheinstrument,butitcanprevent

thereceiverelectronicsfromfunctioningcorrectly.

Avoidlocatingthereceiverorantennawithin400metersofpowerfulradar,

television,orothertransmittersorGNSSantennas.Low‐powertransmitters,

suchasthoseincellphonesandtwo‐wayradios,normallydonotinterfere

withreceiveroperations.

2.6. KEYPADANDDISPLAY



Feature Description

1PowerLEDShowsifthepowerisonoroff.

2Buttons Usetoturnon,turnofforconfigurethereceiver.See

5.1.Buttonfunctions.

3DisplayThisVacuumFluorescentdisplayenablesyouviewthe

currentconfigurationsettingsofreceiverandthe

operationbyoperators.See5.3.Homescreen.



1

22

3

2.Overview

N72GNSSReferenceReceiverUserGuidePage13

2.7. REARCONNECTORS

2.8. 

Connectortype Description

1TNCConnecttotheGNSSantenna

2SIMcardslotSIMcardisinsertedheretoconnectGPRSnetwork

3USB  ConnecttoexternalUSBdriveforexternaldata

loggingafterconfiguredthroughwebinterface.

 Upgradethereceiverfirmwarewiththe

insertedUSBdrivercontainingtherelated

upgradefileafterrestartthereceiver.

 Connectthereceivertoacomputerto

downloadfilesfromthereceiver(asexternal

storageequipment)tothecomputer.

4TNCForexternalGPRSantenna

5TNCForexternalradio

6DB9RS‐232serialport,9‐pinmaleconnector,fordata

communicationwhennecessary

7RJ45jack Supportslinksto10BaseT/100BaseT

auto‐negotiatenetworks

 HTTP,TCP/IP,UDP,FTP,NTRIPCaster,NTRIP

Server,NTRIPClient

 Simultaneouslytransmitsmultipledatastream

8Lemo(10‐pin)Port1 PowerfromanexternalAC/DCpowersupply.

 RS‐232serialcommunicationsusinga10‐pin

Lemocable(CHCDataCable).

 Pass‐throughtothemainboardwithoutissuing

thepass‐throughcommandviathisport.

9Lemo(10‐pin)Port2 PowerfromanexternalAC/DCpowersupply.

 RS‐232serialcommunicationsusinga10‐pin

14

3

5

2

6789

2.Overview

N72GNSSReferenceReceiverUserGuidePage14

Lemocable(CHCDataCable).

 Datastreamingtransmissionport.

N72GNSSReferenceReceiverUserGuidePage15

3. BATTERIESANDPOWER

TheN72GNSSreferencereceiverusesaninternalrechargeableLithium‐ion

battery,whichcanbereplacedonlyatanAuthorizedCHCServiceCenter.

Thereceivercanalsobepoweredbyanexternalpowersourcethatis

connectedtoeitheroftheLemoports.

Theoperationaltimeprovidedbytheinternalbatterydependsonthetype

ofmeasurementandoperatingconditions.Typically,theinternalbattery

providesupto17hoursoperation.

NOTE–Allbatteryoperationaltestsarecarriedoutwithnew,

fully‐chargedbatteriesatroomtemperature,trackingbothGPSand

GLONASSsatelliteswhilestoringandstreamingdataat1Hz.Older

batteries,attemperaturessignificantlyhigherorlowerthanroom

temperature,willhaveareducedperformance.Powerconsumption

increaseswithanincreasingnumberofactivelytrackedsatellitesand

withincreasingobservationandstoragerates.

3.1. EXTERNALPOWER

Thereceiverusesanexternalpowersourceinpreferencetoitsinternal

battery.Ifthereceiverisnotconnectedtoanexternalpowersource,orif

theexternalpowersupplyfails,theinternalbatteryisused.

Thereceiver’sinternalbatterychargesonlywhentheexternalvoltageis

above11VDC.CHCrecommendsthattheappliedexternalpoweroffers

between12VDCand36VDCandisabletosupplyatleast4Wofpowerfor

thelong‐terminstallationsandensuringthattheinternalbatteryischarged

andreadytocompensateforpowersupplydisruptions.

Whilecarryingoutstaticmeasurementsforpost‐processedcomputations

usingtheinternalmemory,ifnoexternalpowerissuppliedandtheinternal

batteryisdrained,thereceivershutsdown.Nodataislost;however,when

powerisrestored,thereceivershouldbeconfiguredagain.

WARNING–TheexternalACpoweradapteranditsassociatedpowercord

andplugarenotintendedtobeinstalledoutdoors,norinawetlocation.Do

notpowerthereceiverthroughexternalpowerwhenoperatinginawet

environmentoranenvironmentthatmaybecomewet.Thepowerinput

connectionsmustbesheltered.

WARNING–WhenyouapplyDCvoltagetothisproductthroughtheLemo

connector,theDCvoltagemustbelimitedto36VDC+0%underboth

3.BatteriesandPower

N72GNSSReferenceReceiverUserGuidePage16

normalandsinglefaultconditions.Thisproductmaypresentanelectrical

hazardiftherecommendedinputvoltageisexceeded.

3.2. BATTERYSAFETY

ThereceiverispoweredbyarechargeableinternalLithium‐ionbattery.

Chargeandusethebatteryonlyinstrictaccordancewiththefollowing

instructions.

WARNING–DonotdamagetherechargeableLithium‐ionbattery.A

damagedbatterycancauseanexplosionorfire,andcanresultinpersonal

injuryand/orpropertydamage.

Topreventinjuryordamage:

– Donotuseorchargethebatteryifitappearstobedamaged.Signsof

damageinclude,butarenotlimitedto,discoloration,warping,and

leakingbatteryfluid.

– Donotexposethebatterytofire,hightemperature,ordirectsunlight.

– Donotimmersethebatteryinwater.

– Donotuseorstorethebatteryinsideavehicleduringhotweather.

– Donotdroporpuncturethebattery.

– Donotopenthebatteryorshort‐circuititscontacts.

WARNING–AvoidcontactwiththerechargeableLithium‐ionbatteryifit

appearstobeleaking.Batteryfluidiscorrosive,andcontactwithitcan

resultinpersonalinjuryand/orpropertydamage.

Topreventinjuryordamage:

– Ifthebatteryleaks,avoidcontactwiththebatteryfluid.

– Ifbatteryfluidgetsintoyoureyes,immediatelyrinseyoureyeswith

cleanwaterandseekmedicalattention.Donotrubyoureyes!

– Ifbatteryfluidgetsontoyourskinorclothing,immediatelyuseclean

watertowashoffthebatteryfluid.

3.3. BATTERYPERFORMANCE

Tooptimizebatteryperformanceandextendbatterylife:

 Fullychargeallnewbatteriesbeforeuse.

 Donotuseatextremetemperatures.Thereceiverisdesignedto

operateat‐40°Cto+65°C(‐40°Fto+149°F).However,operationat

temperaturesoflessthan0°C(32°F)cancausearapiddropinbattery

life.

3.BatteriesandPower

N72GNSSReferenceReceiverUserGuidePage17

3.4. CHARGINGTHEBATTERY

TherechargeableLithium‐ionbatteryissuppliedpartiallycharged.Charge

thebatterycompletelybeforeusingitforthefirsttime.Ifthebatteryhas

beenstoredforlongerthanthreemonths,chargeitbeforeuse.

Whenconnectedtoasuitablepowersource,theinternalbatterycharges

fullyin10hours.

WARNING–ChargeandusetherechargeableLithium‐ionbatteryonlyin

strictaccordancewiththeinstructions.Chargingorusingthebatteryin

unauthorizedequipmentcancauseanexplosionorfire,andcanresultin

personalinjuryand/orequipmentdamage.

Topreventinjuryordamage:

– Donotchargeorusethebatteryifitappearstobedamagedorleaking.

– ChargetheLithium‐ionbatteryonlywithintheN72receiver.The

batterycanonlyberemovedbyanauthorizedCHCServiceCenter.

3.5. STORINGTHEBATTERY

TheinternalLithium‐ionbatteryadoptsaself‐protectionmechanismthat

protectsthebatteryfromdischargewhenitsvoltageisbelow6Vandshuts

downthereceiver.Theinternalbatterywillbeactivatedwhenchargedby

theexternalpowersupply.

Donotstorethereceiverattemperaturesoutsidetherange‐45°Cto+80°C

(‐49°Fto+176°F).

Theinternalbatterywillonlychargefromanexternalpowersourcethat

deliversmorethan11V,forexample,anACpoweradaptor.Thereceiveris

suppliedwithamainspowersupplyunitthatrechargesthebatteryinside

thereceiverwhenitisconnectedthroughtheadaptortoeitheroftheLemo

ports.Whenyouusethereceiverinalong‐terminstallation,CHC

recommendsthatyouusethispowersupplyoranotherthatprovidesat

least12VDCatalltimestokeeptheinternalbatterycharged.Thiswill

ensurethattheinternalbatteryprovidesanuninterruptedpowersupply

thatwillkeepthereceiveroperationalforupto17hoursafterapower

failure.

3.6. REMOVINGTHEBATTERY

TheinternalLithium‐ionbatterymayberemovedonlyatanauthorizedCHC

3.BatteriesandPower

N72GNSSReferenceReceiverUserGuidePage18

ServiceCenter.Ifthebatteryisremovedatanunauthorizedservicecenter,

theremainingwarrantyontheproductwillbevoid.



N72GNSSReferenceReceiverUserGuidePage19

4. SETTINGUPTHERECEIVER

Thischapterdescribesbestpracticesforsettinguptheequipment,and

outlinestheprecautionsthatyoumusttaketoprotecttheequipment.Italso

describesthetypicalinstallationdiagramofreferencestationcomposedof

N72GNSSreceiver,GNSSantenna,externalpowerandnetworkcable.

Theantennainstallationguidelinesdescribedherearetheminimum

standards.Wheninstallingageodeticantennatogatherpreciseobservation

data,alwaysfollowrecommendedCORSinstallationpracticestothegreatest

extentpossible.

4.1. GUIDELINES

Whenyousetupthereceiver,followtheseguidelines.

4.1.1. ENVIRONMENTALCONDITIONS

Thereceiverhasawaterproofhousingbutyoumusttakereasonablecareto

keeptheunitdry.

Toimprovetheperformanceandlong‐termreliabilityofthereceiver,donot

exposethereceivertoextremeenvironmentalconditions,suchas:

 Water

 Heatgreaterthan65°C(149°F)

 Coldlessthan‐40°C(‐40°F)

 Corrosivefluidsandgases

4.1.2. SOURCESOFELECTRICALINTERFERENCE

DonotplacetheGNSSantennanearthefollowingsourcesofelectricaland

magneticnoise:

 Gasolineengines(sparkplugs)

 Televisionsandcomputermonitors

 Alternatorsandgenerators

 Electricmotors

 EquipmentwithDC‐to‐ACconverters

 Fluorescentlights

 Switchingpowersupplies

 Arcweldingequipment

4.1.3. UNINTERRUPTABLEPOWERSUPPLY

CHCrecommendsthatyouuseanuninterruptiblepowersupply(UPS)to

4.SettingUptheReceiver

N72GNSSReferenceReceiverUserGuidePage20

powerthereceiver.TheinternalbatterycanalsooperateasaUPSforupto

17hours.AUPSprotectstheequipmentfrompowersurgesandspikes,and

keepsthereceiverrunningduringshortpoweroutages.

Formoreinformation,contactyourlocalCHCdealer.

4.1.4. LIGHTINGANDSURGEPROTECTION

CHCrecommendsthatyouinstalllightningprotectionequipmentat

permanentsites.Allconnectionstothereceivershouldhavesurge

protection.Typically,theminimumprotectionshouldincludeasurge

protectorintheantennafeedline,onthereceiver'spowersupplysystem.If

serialdevicesareattachedtothereceiver,thoseserialconnectionsshould

alsobeprovidedwithsurgeprotection.Also,protectanycommunications

andpowerlinesatbuildingentrypoints.Ifyouuseotherantennas,suchasa

radiomodemthatdistributesreal‐timecorrectionmessages,installsurge

protectiononthoseantennafeedsaswell.

Nosurgeprotectiondevicescanofferprotectionunlesstheyareconnected

toanexcellentgroundusingverylowimpedanceconductors.Equipment

damagecausedbyelectricalsurgesoccursinmanypermanentinstallations

eventhoughsurgeprotectionisinplace.Commonly,thisisbecausethe

groundingsystemusedwasdesignedtoprotectagainstACelectricalhazards

ratherthantodissipatethesudden,highcurrentsurgescausedbylightning.

Pleaseconsultwithalightningprotectionexpertorresearchthetopicwhen

planningpermanentinstallations.

Formoreinformation,contactyourlocalCHCdealer.

4.1.5. PLACINGTHEANTENNA

TheantennalocationwillhaveasignificanteffectonthequalityofyourN72

receiver'sperformance.Intemporarydevelopmentsitmaynotalwaysbe

possibletosetuponanideallocationwithanexcellentskyview.However,

wheninstallingapermanentstation,besuretoplantheantennalocation

andmountingsystemcarefully.

Thegeneralrequirementsfortheantennalocationandmountare:

 Keepthedistancefromtheobjectsthatmaycausethemultipatheffects

(suchasbuildings,trees,reflectivesurface)foratleast200m(656feet)

 Clearskyabove10degreeselevation

 Awayfromelectromagnetisminterferenceregion(e.g.Microwave

station,radiotransmittingstation,highvoltagewires)atleast200m

(656feet)

 Mounted1.5m(5feet)aboveanynearbysignalreflectors.

4.SettingUptheReceiver

N72GNSSReferenceReceiverUserGuidePage21

 Mountstabilitythatisnotinfluencedbythermalexpansion,wind

loading,orsoilexpansion/contraction.

Foradditionalinformationonthistopic,researchthereferenceantenna

installationguidelinespublishedbythe:

 USNationalGeodeticSurvey

(http://www.ngs.noaa.gov/PUBS_LIB/CORS_guidelines.pdf)

 InternationalGNSSService

(http://igscb.jpl.nasa.gov/network/guidelines/guidelines.html)

4.2. SYSTEMINSTALLATION

4.2.1. SUPPORTEDANTENNA

ThereceiverprovidesaTNC‐typefemaleconnectorforconnectingtoan

antenna.ThereceiverisintendedforusewithaCHCGeodeticGNSSantenna

oraCHCGNSSChokeRingantenna.



OtherGNSSantennasmayhoweverbeusedensuringthattheantenna

receivetheproperGNSSfrequenciesandoperatesateither3.3Vor7.1V

withasignalgreaterthan40dBattheantennaport.

4.2.2. SYSTEMINSTALLATIONDIAGRAM

ThetypicalinstallationdiagramoftheCHCN72GNSSreceiverconnected

withCHCA220GRGNSSGeodeticAntenna,externalpowersupplyand

networkcable.

CHCA220GRGNSS

GeodeticAntenna

CHCC220GRGNSS

ChokeRingAntenna

4.SettingUptheReceiver

N72GNSSReferenceReceiverUserGuidePage22



1. InstalltheGNSSantennaattheappropriatelocation(see4.1.5.Place

theantennafortheguidelines);connecttheantennatotheTNCPlug

SocketofN72viatheGNSSAntennaCable.

2. PowertheN72byexternalpowersource(e.g.mainssupply)with

AdapterviaCHCDataCable.

A. Connectthe10‐pinLemoofCHCDataCabletoCOM1orCOM2of

N72.

B. PlugthemalejackconnectorofAdapterintothefemaleconnector

ofCHCDataCable.



C. ConnecttwolegplugsorthreelegplugsofAdaptertothemains

supply.

3. ConnectthenetworkcabletotheRJ45jackofN72tolinktheN72with

network.

NOTE:Also,theN72canbepoweredbyexternalbatteryviaCHCData

Cable.Andthepowersupplyvoltageshouldbecontrolledbetween

12to36VDC.

GNSSAntennaCable

NetworkCable

CHCA220GRGNSS

GeodeticAntenna

Adapter

CHCDataCable

N72GNSSReferenceReceiverUserGuidePage23

5. CONFIGURINGTHERECEIVER:KEYPADAND

DISPLAY

TheN72GNSSreferencereceiverfeaturesafrontpaneluserinterfacewitha

keypadandatwo‐linealphanumericdisplay(seepage14).Thisinterface

enablesyoutoconfiguremanyofthereceiver’sfeatureswithoutusingan

externalcontrollerorcomputer.

5.1. BUTTONFUNCTIONS

Usethebuttonsonthefrontpaneltoturnonorturnoffthereceiverandto

checkorchangethereceiversettings.

Button Name Function



PowerTurnonorturnoffthereceiver.

Whenthereceiverisonlypoweredbyinternalbattery:

 Toturnonthereceiver,pressandholdfor3seconds.

 Toturnoffthereceiver,pressandholdfor2seconds.

Whenthereceiverispoweredbyexternalpowersupply:

 Thereceiverwillbeonwithpower.

 Thereceiverwillbeturnedoffbyremovingthepowersupplyfrom

theCHCcable.



Escape Returntothepreviousscreenorcancelchangesyoumakeonascreen.



OK Advancetothenextscreenoracceptchangesyoumakeonascreen.



Up Movethecursorbetweenmultiplefieldsonascreen,ormakechanges.



Down Movethecursorbetweenmultiplefieldsonascreen,ormakechanges.



Left Movethecursorbetweencharactersinaneditablefield.



Right Movethecursorbetweencharactersinaneditablefield.



5.2. HOMESCREEN

Thisisthemainreceiverscreen.

5.ConfiguringtheReceiver:KeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage24



TheHomescreenshows:

 Thenameoftheproduct.

 Thepositionsolution.

 Thenumberofsatellitesbeingtracked.

Asapower‐savingfeature,thefrontpanelgoesdarkafterashortperiodof

inactivity.Ifthedisplayisnotlitandthereceiverison,pressANYBUTTON

toreactivatethedisplay.

5.3. STATUSSCREENS

Toreviewthereceiver'scurrentsettingsinthestatusscreens,press

oronthefrontpanel.Thestatusscreensshowthefollowing

information:

 CurrentNetworkconnectionstate

• CurrentIPaddress(editable)

• CurrentIPmask(editable)

• CurrentGateway(editable)

• CurrentDNSServer(editable)

• CurrentHTTPport(editable)

• Theinternalbatterypowerremaining

• Internalstoragememoryremaining

• Receiverhardwareversionandsoftwareversion

 Receiverserialnumberandpartnumber



5.ConfiguringtheReceiver:KeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage25

5.4. SETTINGUPTHERECEIVERASPARTOFANETHERNET

CONFIGURATION

UsethekeypadtosetupthereceiveraspartofanEthernetconfiguration.

Pressor  tomovebetweendifferentstatusscreens,andthen

presstoentertheeditmode.

1. Turnonreceiverbypressorconnectthereceiverwithexternal

powersupply.

2. Pressor  tomovetoIPAddrstatusscreen.

3. PresstoeditIPaddress.

4. Pressor  toselectthecharactertoeditandthenpress

or  tochangeit.

5. Whenfinished,press ,andthenthe“SettingSuccess”messagewill

appearonthedisplay.

6. Followthestep2tostep5toeditIPmask,gateway,DNSserverand

HTTPportintheIPMASK,Gateway,DNSServerandHTTPPORTstatus

screen,respectively.



N72GNSSReferenceReceiverUserGuidePage26

6. CONFIGURINGTHERECEIVER:OTHERTHAN

KEYPADANDDISPLAY

YoucanconfiguretheN72GNSSreferencereceivertoperformawidevariety

offunctions.Thischapterdescribestheconfigurationmethodsotherthan

thefrontpaneldisplay,andexplainswhenandwhyeachmethodisused.

TheWinFlashutilitydescribedinthischapterisusedprimarilytoupdatethe

receiverfirmware.

6.1. CONFIGURINGTHEETHERNETSETTINGS

ThereceiverEthernetportconnectstoanEthernetnetwork,throughwhich

youcanaccess,configure,andmonitorthereceiver.Noserialcable

connectiontothereceiverisnecessary.

ThereceiverhasthefollowingEthernetsettings:

• IPaddress

• IPmask

• Gateway

• DNSserver

• HTTPport

ThedefaultsettingfortheHTTPportis80:Thisportisnotassignedbythe

network.HTTPport80isthestandardportforwebserversandenablesyou

toconnecttothereceiverbyenteringonlythereceiver’sIPaddressinaweb

browser.

Forexample,usingport80:http://192.168.9.69

Ifthereceiverissettouseaportotherthan80,youmustentertheIP

addressfollowedbytheportnumberinawebbrowser.

Forexample,port9971:http://169.168.9.69:9971

UserscanconfiguretheEthernetsettingsthroughthefrontpanel(see5.4.

SettingupthereceiveraspartofanEthernetconfiguration)andaweb

server.Touseawebserver,thereceivermustbeconnectedtoanetwork

andhaveavalidEthernetconfiguration.

NOTE:ThereceivershouldbeconfiguredtheEthernetsettings

throughthefrontpanelforitsfirstconnectiontotheInternet.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage27

6.2. CONFIGURINGTHROUGHAWEBBROWSER

Supportedbrowsers:

 GoogleChrome

 MicrosoftInternetExplorer○

Rversion10,orhigher

 AppleSafari

Toconnecttothereceiverthroughawebbrowser:

1. EntertheIPaddressofthereceiverintotheaddressbaroftheweb

browser:



2. Thewebbrowserpromptsyoutoenterausernameandpassword:



Thedefaultloginaccountforthereceiveris:

 LoginAccount:admin

 Password:password

NOTE:Tickremembermeoption,andthenthebrowserwill

remembertheLoginAccountandPasswordyouenteredforthenext

timeyouenterthisloginscreen.

3. Onceyouareloggedin,thewebpageappearsasfollows:

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage28



6.2.1. CHANGINGTHESETTINGS

Thewebinterfaceshowstheconfigurationmenusontheleftofthebrowser

window,andthesettingontheright.Eachconfigurationmenucontainsthe

relatedsubmenustoconfigurethereceiverandmonitorreceiver

performance.

Thissectiondescribeseachconfigurationmenu.

Toviewthewebinterfaceinanotherlanguage,selectthecorresponding

languagenamefromthedrop‐downlistintheupperrightcornerofthe

interface.

Currently,threelanguagesareavailable:



6.2.1.1. Statusmenu

Thismenuprovidesaquicklinktoreviewthereceiver'spositioninformation,

satellitestracked,runtime,currentdatalogstatus,currentoutputs,available

memory,andmore.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage29



 Position

Thispageshowstherelevantpositioninformationaboutthereceiver's

positionsolutionwhichincludingtheposition,DOPvalues,satellites

usedandtracked,andthereceiverclockinformation.



 Operation

Listsseveralimportantitemstohelpyouunderstandhowthereceiveris

beingusedanditscurrentoperatingcondition.Itemsincludethe

identitiesofcurrentlytrackedsatellites,internalandexternalstorage

usagerate,howlongthereceiverhasbeenoperational,stateofthe

internalbattery,powersourcestate,filesbeinglogged,anddata

streamsbeingoutput.Withthisinformation,itiseasytotellexactly

whatfunctionsthereceiverisperforming:

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage30



 Googlemap

TapthissubmenutoshowthelocationofthereceiveronGooglemap.



6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage31

6.2.1.2. Satellitesmenu

UsetheSatellitesmenutoviewsatellitetrackingdetailsandenable/disable

GPS,SBAS,GLONASS,BDSandGalileoconstellations.Thesemenusinclude

tabularandgraphicaldisplaystoprovideallrequiredinformationonsatellite

trackingstatus.



 SatelliteTrackTable

Providesthestatusofsatellitestrackedingeneral,suchasthesatellite

ID,satellitetype,attitudeangle,azimuthangle,L1SNR,L2SNR,L5SNR

andenable/disablestatusofeachone.



 SatelliteTrackDiagram

Thefollowingfigureisanexampleofsatellitetrackdiagrampage.Users

candeterminethesatellitetypesandthecorrespondingSNRofL‐band

carrierstobedisplayedinanycombination.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage32



 SkyPlot

ThefollowingfigureisanexampleofSkyplotpage.



 SatelliteSettings

Inthissubmenu,userscanenable/disableGPS,SBAS,GLONASS,BDS

andGalileoconstellations.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage33



6.2.1.3. ReceiverSettingsmenu

Usethismenutoconfiguresettingssuchastheantennatypeandheight,

elevationmaskandPDOPsetting,thereferencestationcoordinates,receiver

resettingandwebinterfacelanguage:



 Introduction

Thissubmenushowsthereceiverinformationandreferencestation

information,includingantennarelatedinformation,elevationmask

angle,referencestationworkmodeandposition,etc.



 AntennaParamSettings

UsethisscreentoconfigurealloftheitemsrelatingtotheGNSS

antenna.Youmustenterthecorrectvaluesforallantenna‐relatedfields,

asthechoicesyoumakesignificantlyaffecttheaccuracyforloggeddata

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage34

andbroadcastRTKcorrectors:



 ReferenceStationSettings

Usethisscreentoconfiguresettingssuchasthestationcoordinates.You

mustenteraccurateinformationinthesefields,asthisdatasignificantly

affectstheaccuracyofloggeddatafilesandbroadcastRTKcorrectors.



ForReferenceStationMode:

Therearethreeavailableoptions:AutoRover,AutoBaseand

ManualBase.

 AutoRover:ThereceiverwillserveasRoveraftertherestart.

 AutoBase:ThereceiverwillserveasBaseaftertherestart,and

thenbroadcastRTKcorrectorsbasedoncoordinatesobtained

throughsingle‐pointpositioningautomatically.

 ManualBase:ThereceiverwillserveasBaseaftertherestart,

andthenbroadcastRTKcorrectorsbasedonthecoordinates

beforepoweroff.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage35

ForReferenceLatitudeandReferenceLongitude:

Therearemainlythreemethodstoenterthereferencecoordinates

andshownasfollows:

 AcquireCurrentPosition:Clickthisbuttontoacquirecurrent

positionobtainedthroughsingle‐pointpositioning

automatically.

 ManualInput:Manuallyinputaknowncoordinates.

 FromCORS:AfterlogginginCORS,thereceiverwillobtaina

coordinatesbasedonfixsolution.(See6.2.1.5.IOSettings

menuformoredetailsaboutlogginginCORS.)

ForSampleforAverage:

Userscandeterminethepositioninglimitandsamplingamount.

Thepositioninglimitfallsintotwotypes:

 SingleSolutionCoordinates:Collectthecoordinatesofreceiver

obtainedthroughsingle‐pointpositioning.

 FixedSolutionCoordinates:Onlycollectcoordinatesof

receiverbasedonfixsolution.

Aftertheconfigurationofpositioninglimitandsamplingamount,

clicktocarryoutsamplingandaveragingtheresult

willbeservedasthecoordinatesofcurrentpositon.

Also,userscanclicktosavethecurentsettings.

 ReceiverReset

Usethisscreentocompletelyorpartiallyresetthereceiver:



 Languages

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage36

Usethisscreentoselectthewebinterfacelanguage:



6.2.1.4. DataRecordingmenu

UsetheDataLoggingmenutosetupthereceivertologstaticGNSSdataand

toviewtheloggingsettings.Youcanconfiguresettingssuchasobservable

rate,recordingrate,continuouslogginglimit,andwhethertoautodeleteold

filesifmemoryislow.ThismenualsoprovidesthecontrolsfortheFTPpush

feature:



 LogSettings

Showsthedataloggingstatus,internalandexternalstorageusageand

dataloggingstatusofeachstoragethread.Also,userscanconfigurethe

dataloggingsettingsforeachstoragethread,includingrecordingname,

savinglocation,storagelimit,storeformats,starttime,etc.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage37



Toopenorcloseallthestoragethreads,clickthe[ON]or[OFF]button

totherightofLogStatusfield.

NOTE–The[ON]and[OFF]buttontotherightofLogStatusfieldare

theMasterLogSwitch.Everystoragethreadcanlogdataonlywhen

theMasterLogSwitchisON.Anduserscaneditthesettingsof

storagethreadsonlywhentheMasterLogSwitchisOFF.

Toeditthesettingsofeachstoragethread,clickthe[Modify]buttonto

therightoftherequiredstoragethread,andthentheRecordingEdit

screenappears:



6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage38

Inthisscreen,youcansetalldataloggingparameters,and

determinewhethertherecordingfileswillbeaffectedbytheFTP

Push.Theparametersaremainlyasfollows:

 OnorOff:Select“Yes”or“No”todeterminewhethertolog

datawhentheMasterLogSwitchisON.

 RecordingName:Thenameofthisstoragethread.

 SampleInterval:Selecttheobservableratefromthedropdown

list.

 StoreLocation:Determinewhethertostoreatinternalstorage

orexternalstorage.

 StartTime:SetthestarttimeofdataloginUTC.Select“Yes”or

“No”optionbelowtodeterminewhethertostartloggingfrom

thesettime.

 DurationTime:Setthetimeintervalofrecording.

 Storage:Setthestoragelimitofthisthread.

 RecycleStorage:Select“Yes”or“No”todeterminewhetherto

autodeleteoldfilesifthestoragespaceisfull.

 StorageFormat:ThedefaultformatofrecordingfilesisHCN.

 FTPPush:DecidewhethertopushthestoredfilestotheFTP

serverofyourchoice.

ClicktosavethesettingsandbacktotheLogSettings

screen.Also,userscanclicktoabandonthechanged

settingsandbacktoLogSettingsscreen.

NOTE–todeletetherecorddata,youcanremovealltheeightrecord

databythetotalbuttonclearallaccounts.Alsoyoucandeleteeach

recorddatabyclearbuttonundertheselectedthread.

TodeletetherecordedfilesofANYstoragethread,clickthe[Clear]

buttontotherightoftherequiredstoragethread.

TodeletetherecordedfilesofALLstoragethreads,click[ClearAll

Accounts]button.

 FTPPushSettings

UsethisscreentoconfigurethereceivertopushstoredfilestotheFTP

serverofyourchoice.OnlyfilesthatareconfiguredtouseFTPpushare

transmitted.Click[Modify]buttontotherightoftherequiredFTP

serverandtheFTPPushSettingsscreenappears:

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage39



 FTPPushRecording

Showstherelatedinformationabouttherecordedfiledthatbepushed.

Anduserscanclick[ClearFtpSendLog]buttonintheupperrightcorner

toclearthestatusofFTPPushoperations.

 DataDownload

Inthissubmenu,userscandownloadthedatafilesthatrecordedinthe

internalstoragethroughtheinternalFTPsite.

1. Clickthissubmenu,andthenthelogondialogueboxwillprompt

youtoenterausernameandpassword:



ThedefaultlogonaccountfortheinternalFTPsiteis:

 Username:ftp

 Password:ftp

2. Clickthedirectorynamedasrepotoviewanddownloadthefiles

currentlystoredonthereceiver:

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage40



3. Tofindthefileneedtobedownloaded,clickthenameofstorage

threadthedateoffilethatberecordedtheformatofthefile

thenameofthetargetfile.



4. Todownloadafile,left‐clickthenameofthetargetfile

downloadthefileaccordingtotheprompts.

6.2.1.5. IOSettingsmenu

UsetheIOSettingsmenutosetupallreceiveroutputsandinputs.The

receivercanoutputCMR,RTCM,Rawdata,Ephemerisdata,GPGGA,GPGSV,

onTCP/IP,UDP,serialport,orBluetoothports.

 IOSettings

Thefollowingfigureshowsanexampleofthescreenthatappearswhen

youselectthissubmenu.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage41



Inthissubmenu,userscanconfigure5typesofinputandoutput

settings.

1. RTKClient

AfterconfiguringthesettingsofRTKclient,userscanlogonCORSor

APIS.Clickthe[Connect]buttontotherighttheIOSettingsscreen

willappearchooseoneoftheconnectionprotocolsamongtheNTRIP,

APIS_BASEandAPIS_ROVERconfiguretherelatedparameters

clicktologonCORSorAPIS.

 ConnectionProtocol:NTRIP



 ConnectionProtocol:APIS_BASE

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage42



 ConnectionProtocol:APIS_ROVER



2. TCP/UDPClient

Clickthe[Connect]buttontotherightofrequiredTCP/UDPClient

theIOSettingsscreenwillappearselecttheconnectionprotocol

fromthedropdownlistentertheIPandPortofthetargetserver

configuremessagesthatyouwanttooutputtothetargetserverclick

tosaveandcompletetheconnection.



6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage43

NOTE:IfthereceiverandserverareunderthesameLocalArea

Network(LAN),userscanusetheIPaddressinLANoftheserverwith

anyPort.However,ifthereceiverandserverareunderthetwo

differentLAN,usersshouldusethepublicIPaddressoftheserver

andconfiguretheportmappingoftheserver.

3. TCP/IPServer

Clickthe[Connect]buttontotherightofrequiredTCP/IPServerthe

IOSettingsscreenwillappearselectoneoftheconnectionprotocols

betweenNTRIPandTCPconfiguretheotherrelatedparameters

clicktosavethesettingsandopentheserver.

 ConnectionProtocol:NTRIP



 ConnectionProtocol:TCP

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage44



4. COMPort

Clickthe[Settings]buttontotherightofrequiredCOMPortthe

SerialPortSetupscreenwillappearselectBaudRateusedto

transmitdataconfigurethemessagesthatyouwanttooutput

throughtheserialportclicktosavethesettingsand

starttotransmit.



5. Bluetooth

Clickthe[Settings]buttontotherightofBluetooththeBluetoothSet

screenwillappearconfigurethemessagesthatyouwanttotransmit

throughBluetoothclicktosavethesettingsandstart

totransmit.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage45



6.2.1.6. GPRSmenu

NetworkInfo:networkinfoshowspowerstatus,networkmode,connection

protocol,signalstrength,SIMstatusanddialingstatus.



Networkset：mainlytosetGPRSmodelstatus,autostart,networkmode

(generallyusersselect[2G/3GAuto]),parametersettingsandsoon.



6.2.1.7. Radiosettingmenu

RadioInfo:showsradiotype,radiopower,OTAbaudrate,radiofrequency

andsoon.



Radiosetting:tosetradiostatus,autostart,radiopower,frequencyandso

on.Whenusingwebpagesettingaloneandtheradiofunctionisrequired,

usersneedtoturnonRadioStatusandAutoStart.IftheradioinIOsettingis

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage46

requiredtobeused,thepremisesarealsoturningonradiostatus,setting

appropriatefrequency,powerandsoon.



6.2.1.8. WANmenu

UsethismenutocheckandconfiguretheEthernetsettings.

 NetworkInfo

Thefollowingfigureshowsanexampleofthescreenthatappearswhen

youselectthissubmenu:



 NetworkSet

UsethissubmenutoconfiguretherelatedparametersoftheNetwork,

includingstaticIP,subnetmask,etc.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage47



6.2.1.9. Wifimenu

UsethismenutocheckandconfiguretheWifisettings.

 WifiInfo

Thefollowingfigureshowsanexampleofthescreenthatappearswhen

youselectthissubmenu:



 WifiSettings

UsethissubmenutoconfiguretherelatedparametersoftheWi‐Fi

settings,includingWi‐Fimode,encrypttype,password,etc.

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage48



6.2.1.10. BluetoothSetmenu

UsethismenutoconfigureBluetoothsettings.

 BluetoothSet

Thefollowingfigureshowsanexampleofthescreenthatappearswhen

youselectthissubmenu:



6.2.1.11. NetworkServicemenu

Usethismenutoconfigurethereceiver’sHTTPport,andtheusernameand

passwordofinternalFTPsite.

 HTTP



6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage49

 FTPService



6.2.1.12. Firmwaremenu

Usethismenutocheckthecurrentfirmwareinformation,downloadthe

systemlog,updatethereceiverfirmware,downloadorupdatethe

configurationfileandregisterthereceiver.

 FirmwareInfo

Usethissubmenutocheckthecurrentfirmwareinformation.The

followingfigureshowsanexampleofthefirmwareinformation.



 SystemLog

Usethissubmenutodownloadthesystemlogofthereceiver.



 FirmwareUpdate

Usethissubmenutoloadnewfirmwaretothereceiveracrossthe

network.Clickthe[Browse]buttontolocatetheupgradefileclick

[Confirm]buttontoconfirmtheselectedupgradingfileandstart

6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage50

upgrading.



NOTE:Itwilltakeabout2or3minutestocompletethefirmware

upgrading.

 ConfigFile

Inthissubmenu,userscandownloadtheconfigurationfilebyclicking

buttonanddetermineasavingpathtodownloadthe

configurationfile(.cfgfile).Also,userscanclickthe[Browse]buttonto

locatetheexistingconfigurationfileclick[Confirm]buttontoconfirm

theselectedfileandstartupdating.



 GNSSRegistration

Usethissubmenutoregisterthereceiver.Pasteorentertheregistration

codetotheRegistrationCodefieldclick[Registration]buttonto

completetheregistration.



6.ConfiguringtheReceiver:OtherThanKeypadandDisplay

N72GNSSReferenceReceiverUserGuidePage51



N72GNSSReferenceReceiverUserGuidePage52

7. DEFAULTSETTINGANDCONFIGURATIONFILES

Mostofthereceiversettingsarestoredinapplicationfiles.Thedefault

applicationfile,Default.cfg,isstoredpermanentlyinthereceiver,and

containsthefactorydefaultsettingsfortheN72GNSSreferencereceiver.

Wheneverthereceiverisresettoitsfactorydefaults,thecurrentsettings

(storedinthecurrentconfigurationfile,copy.cfg)areresettothevaluesin

thedefaultapplicationfile.

TheN72GNSSreferencereceiverextendstheuseofconfigurationfilesto

allowsimplifiedreceiversettingduplicationinmultiplereceivers.Thisis

sometimesreferredtoasreceivercloningandisveryusefulwhenpreparing

alargegroupofreceiversforafielddatacollectioncampaign.

7.1. DEFAULTRECEIVERSETTINGS

Function  Factorydefaultvalues

SVEnable  AllSVsenabled

GeneralcontrolsElevationmask

PDOPmask

0°

6°

LemoportBaudrate

Format

Flowcontrol

9600

8‐None‐1

None

DB9portBaudrate

Format

Flowcontrol

9600

8‐None‐1

None

Logstatus  OFF

Differentialdata  OFF

Rawdata  OFF

Ephemerisdata  OFF

NMEA(GPGGA,GPGSV) OFF

ReferencepositionLatitude

Longitude

Height

0°0’0.00000000’’

0.000

AntennaType

MeasureMethod

Height

CHCA300GNSS

2.0000(Meter)

AntennaPhaseCenter

7.1.1. RESETTINGTHERECEIVERTOFACTORYDEFAULTS

LoginthewebpageofthereceivertapandunfoldtheReceiverReset

menutaptheReceiverResetsubmenuclickthe

buttontotherightofBacktoDefaultSettingfield.

7.DefaultSettingsandApplicationFiles

N72GNSSReferenceReceiverUserGuidePage53



7.1.2. USINGCONFIGURATIONFILESTODUPLICATERECEIVERSETTINGS

TheN72GNSSreferencereceiverallowstheextensiveuseofapplicationfiles

inordertoretainauniquereceiverconfiguration.Withthisreceiver,youcan

createaconfigurationfilethatincludesmostofthereceiver'sunique

configurationsettings.Youcanthenupdatethatconfigurationfileontoone

ormoreotherN72GNSSreferencereceiverstoquicklyconfigurethemto

matchthereceiverwhichcreatesthatconfigurationfile.

NOTE:Theconfigurationfileincludesmostoftheconfiguration

settingsexceptIPAddress,IPMask,GatewayandDNSServer.

Thisiscalledreceiverconfigurationcloningorcloning.Receivercloning

greatlyreducesthetimerequiredtopreparealargegroupofreceiversfor

fieldoperations.

LoginthewebpageofthereceivertapandunfoldtheFirmwaremenu

taptheConfigFilesubmenuclickthe[Browse]buttontolocatethe

existingconfigurationfileclick[Confirm]buttontoconfirmtheselected

fileandstartupdating.



N72GNSSReferenceReceiverUserGuidePage54

8. SPECIFICATIONS

ThischapterdescribesthespecificationsfortheN72GNSSreferencereceiver.

Specificationsaresubjecttochangewithoutnotice.

8.1. GNSSCHARACTERISTICS

Feature Specification

Tracking 220channels

– GPS:L1C/A,L2C,L2E,L5

– GLONASS:L1C/A,L1P,L2C/A,L2P

– SBAS:WAAS,EGNOS,MSAS

– Galileo:E1,E5A,E5B

– BDS:B1,B2

 Pseudo‐rangemeasurementwithhigh‐precision

multi‐correlator

 Verylownoisecarrierphasemeasurementswith<1mm

precisionina1Hzbandwidth

RealTimeKinematic(RTK)Horizontal:8mm+1ppmRMS

Vertical:15mm+1ppmRMS

PostProcessingStaticHorizontal:2.5mm+0.5ppmRMS

Vertical:5mm+0.5ppmRMS

InitializationtimeTypically<10s

InitializationreliabilityTypically>99.9%

8.2. COMMUNICATION

FeatureSpecification

RJ45JackEthernet

DB9male3‐wireRS232,seeC.I.CHCN72receiverCOM1(10‐pinLEMOport)

definitionfordetails

COM1(10‐pinLEMOport)8‐wireRS232,seeC.II.CHCN72receiverCOM2(10‐pinLEMOport)

definitionfordetails

COM2(10‐pinLEMOport)9‐wireRS232,seeC.III.CHCN72receiverdb9maleconnector

definitionfordetails

USBportType‐AUSBreceptacle,operatesinHostmode

BluetoothFullyintegrated,fullysealed2.4GHzBluetoothwirelesstechnology

ProtocolsCorrectionformats:CMR,CMR+,SCMR,RTCM2.3,3.0

Observables:RT17,RT27,RTCM3.X

Position/StatusI/O:NMEA‐0183V2.30(GPGGA&GPGSV)



8.Specifications

N72GNSSReferenceReceiverUserGuidePage55

8.3. PHYSICAL

Feature Specification

Size265x143x68mm(10.4x5.6x2.7in)

Weight2.1kg(74oz)

Operatingtemperature

Storagetemperature

‐40°Cto+65°C(‐40°Fto+149°F)

‐45°Cto+80°C(‐49°Fto+176°F)

Humidity100%condensation

Waterproofanddust

proof

TestedtoIP67;waterprooffortemporaryimmersiontoadepthof1m

(3.28ft)for30minutes;dustproof

ShockDesignedtosurvivea1m(3.28ft)dropontoconcrete

8.4. ELECTRICAL

Feature Specification

Powerconsumption4Wnominal,dependentonusersettings

Internal Integratedinternalbattery7.4V,10000mA‐hr,Lithium‐ion

 InternalbatterycanoperateasaUPSintheeventofexternal

powersourceoutage

 Internalbatterywillchargefromtheexternalpowersourcewhen

theinternalbatteryisnotfullycharged

External Powersourcesupply(Internal/External)ishotswapcapableinthe

eventofpowersourceremovalorcut‐off

 PowerinputonLemoportsis12VDCto36VDCexternalpower

input

 Receiverwillautopoweronwhenconnectedtoexternalpower

withvoltageabove11V

Operationtimeon

internalbattery

Upto17hourscontinuousoperation,dependentonusersetting

8.5. GENERAL

Feature Specification

Frontpaneldisplay VacuumFluorescentDisplay(VFD),16charactersby2rows

 PowerbuttonandindicationLED

 Escape,OKand4arrowkeys(up,down,left,right)

Receivertype GNSSreferencereceiver

Antennatype CHCA220GRGNSSGeodeticantennaorCHCC220GRGNSSChoke

Ringantennapreferred.

 Othermodelssupported.



8.Specifications

N72GNSSReferenceReceiverUserGuidePage56

8.6. DATASTORAGE

FeatureSpecification

Internalstorage16GB

ExternalstorageSupportingUSBdriveorportableharddrive

Storagemethod8‐threadlogging,circulatingdatalogging

DataformatHCN,RINEX,originalbinarydata

DatadownloadFTPpush,onlinedownload,storageonanexternalUSBdevices



N72GNSSReferenceReceiverUserGuidePage57

A. UPGRADINGTHERECEIVERFIRMWARE

Thereceiverissuppliedwiththelatestversionofthereceiverfirmware

alreadyinstalled.Ifalaterversionofthefirmwarebecomesavailable,use

theUSBdevicetoupgradethefirmwareonyourreceiver.Forthelatest

firmwareresource,pleaseconsultyourlocalCHCdealer.

Youcanalsoupgradethereceiverthroughthewebinterface.Thefirmware

filerequiredtoupgradethereceiverthroughtheWebinterfaceislocatedin

thefolderwheretheusersavesthefile.Thefiletyperequiredistheformat

update_n72_e_vXXXXX_bYYYYMMDD.binwhereXXXXXrepresentsthe

versionoffirmwareandYYYYMMDDrepresentsthefirmwareencapsulation

date.

A.I. THEWINFLASHUTILITY

TheWinFlashutilitycommunicateswithCHCproductstoperformvarious

functionsincluding:

 loadorverifyGPSsoftwareofthemainboard

 updateorverifythereceiveroptions

Formoreinformation,onlinehelpisalsoavailablewhenusingtheWinFlash

utility.

A.I.i. INSTALLINGTHEWINFLASHUTILITY

YoucandownloadtheWinFlashutilityfromtheTrimblewebsite.This

self‐extractingexecutableguidesyouthroughthesoftwareinstallation

process.

A.II. UPGRADINGTHERECEIVERFIRMWARE

A.II.i. UPGRADINGTHROUGHUSBPORT

1. Copythefirmwarefiletotherootdirectoryofexternalstoragedevice

suchasUSBdrive,portableharddrive.

2. ConnecttheexternalstoragedevicewithreceiverthroughUSBport.

3. Restartthereceiverandthenthescreenwillpromptyouwhetherto

upgradethefirmware.

4. PressOKbuttontoupgradethefirmware.

5. Whentheupgradingiscompleted,thereceiverwillberestartedand

thescreenwillpromptyouwhethertoupgradethefirmwareagain.

6. Pressoneofthearrowkeystoquittheupgradingandthenremovethe

externalstoragedevice.

A.UpgradingtheReceiverFirmware

N72GNSSReferenceReceiverUserGuidePage58

A.II.ii. UPGRADINGTHROUGHABROWSER

Pleaseconnecttothereceiverthroughawebbrowseraccordingto6.2.

Configuringthroughawebbrowser,andthenreferto6.2.1.10Firmware

menuFirmwareUpdatefordetailoperationsteps.

NOTE:Afterthereceiverfirmwareupgrading,theIPinformationmay

bechanged.PleaseconfirmtheIPsettingofthereceiverbeforeusing

it.



N72GNSSReferenceReceiverUserGuidePage59

B. TROUBLESHOOTING

Usethisappendixtoidentifyandsolvecommonproblemsthatmayoccur

duringtheuseofthereceiver.

PleasereadthissectionbeforeyoucontactCHCTechnicalSupport.

B.I. RECEIVERISSUES

Thissectiondescribessomepossiblereceiverissues,possiblecauses,and

howtosolvethem.

Issue Possiblecause Solution

Thereceiverdoes

notturnon.

Externalpoweristoo

low.

Checkthechargeontheexternalbatteryand,ifapplicable,

checkthefuse.

Internalpoweristoo

low.

Checkthechargeontheinternalbattery.

Externalpowerisnot

properlyconnected.

CheckthattheLemoconnectorisseatedcorrectlyandthat

thecableissecuredtothereceiver.

Checkforbrokenorbentpinsintheconnector.

Faultypowercable.Checkthatyouareusingthecorrectcableforthe

connectionbetweenLemoportandexternalpowersupply.

Checkthatthecorrectexternalpowersupplyisconnected

toaparticularLemoport.

Checkpinoutswithamultimetertoensureinternalwiring

isintact.

Receiverdoesnot

logdata.

Thereceiveristracking

fewerthanfour

satellites.

Waituntilthereceiverdisplayshowsthatmorethanfour

satellitesarebeingtracked.

Thereceiverisnot

responding.

Receiverneedsasoft

reset.

Turnoffthereceiverandthenturnitbackonagain.

Thereference

stationreceiveris

notbroadcasting.

Portsettingsbetween

referencereceiverand

radioareincorrect.

ChecktheportsettingsforthereceiverbyusingtheWeb

interface.Checkthattheradioportsarecorrectlysetup.

Faultycablebetween

receiverandradio.

Tryadifferentcable.

Examinetheportsformissingpins.

Useamultimetertocheckpinouts.

Nopowertoradio. Iftheradiohasitsownpowersupply,checkthechargeand

connections.

Thereceiverisnot

receivingsatellite

signals

TheGNSSantennacable

isloose.

MakesurethattheGNSSantennacableistightlyseatedin

theantennaconnectorontheGNSSantenna.

Thecableisdamaged.Checkthecableforanysignsofdamage.Adamagedcable

caninhibitsignaldetectionfromtheantennaatthe

receiver.

B.Troubleshooting

N72GNSSReferenceReceiverUserGuidePage60

TheGNSSantennaisnot

inclearlineofsightto

thesky.

MakesurethattheGNSSantennaislocatedwithaclear

viewofthesky.

Restartthereceiverasalastresort(turnoffandthenturn

itonagain).



N72GNSSReferenceReceiverUserGuidePage61

C. COMMUNICATIONPORTSDEFINITION

C.I. CHCN72RECEIVERCOM1(10‐PINLEMOPORT)

DEFINITION



PINSignalNameDescription

1RXDRS232‐RX(pass‐throughtothemainboardthroughthispin)

2TXDRS232‐TX(pass‐throughtothemainboardthroughthispin)

3PWRExternalPowerInput(positivepole)

4PWRExternalPowerInput(positivepole)

5PWR,GNDExternalPowerInput(negativepole),ExternalPowerGround

6PWR,GNDExternalPowerInput(negativepole),ExternalPowerGround

7SignalPPSsignaloutput

8NotUsed

9NotUsed

10SignalEVENTsignalinput

C.II. CHCN72RECEIVERCOM2(10‐PINLEMOPORT)

DEFINITION



PINSignalNameDescription

1RXDRS232‐RX(receivedatathroughthispin)

2TXDRS232‐TX(transmitdatathroughthispin)

3PWRExternalPowerInput(positivepole)

4PWRExternalPowerInput(positivepole)

5PWR,GNDExternalPowerInput(negativepole),ExternalPowerGround

C.CommunicationPortsDefinition

N72GNSSReferenceReceiverUserGuidePage62

6PWR,GNDExternalPowerInput(negativepole),ExternalPowerGround

7VBUSUSBdevice

8DMUSBdevice

9DPUSBdevice

10NotUsed

C.III. CHCN72RECEIVERDB9MALECONNECTORDEFINITION



PINSignalNameDescription

1NotUsed

2TXDRS232‐TX(transmitdatathroughthispin)

3RXDRS232‐RX(receivedatathroughthispin)

4NotUsed

5GNDExternalPowerGround

6NotUsed

7NotUsed

8NotUsed

9NotUsed



N72GNSSReferenceReceiverUserGuidePage63

D. GLOSSARY

basestation Alsocalledreferencestation.Abasestationinconstruction,isareceiverplacedat

aknownpointonajobsitethattracksthesamesatellitesasanRTKrover,and

providesareal‐timedifferentialcorrectionmessagestreamthroughradiotothe

rover,toobtaincentimeterlevelpositionsonacontinuousreal‐timebasis.Abase

stationcanalsobeapartofavirtualreferencestationnetwork,oralocationat

whichGPSobservationsarecollectedoveraperiodoftime,forsubsequent

postprocessingtoobtainthemostaccuratepositionforthelocation.

carrierAradiowavehavingatleastonecharacteristic(suchasfrequency,amplitude,or

phase)thatcanbevariedfromaknownreferencevaluebymodulation.

carrierfrequencyThefrequencyoftheunmodulatedfundamentaloutputofaradiotransmitter.The

GPSL1carrierfrequencyis1575.42MHz.

carrierphaseThetimetakenfortheL1orL2carriersignalgeneratedbythesatellitetoreach

theGPSreceiver.Measuringthenumberofcarrierwavesbetweenthesatellite

andreceiverisaveryaccuratemethodofcalculatingthedistancebetweenthem.

CMR

CMR+

CompactMeasurementRecord.Areal‐timemessageformatdevelopedbyTrimble

forbroadcastingcorrectionstootherTrimblemainboardreceivers.CMRisamore

efficientalternativetoRTCM.

DGPSSeereal‐timedifferentialGPS.

differential

correction

DifferentialcorrectionistheprocessofcorrectingGPSdatacollectedonarover

withdatacollectedsimultaneouslyatabasestation.Becausethebasestationis

onaknownlocation,anyerrorsindatacollectedatthebasestationcanbe

measured,andthenecessarycorrectionsappliedtotheroverdata.

Differentialcorrectioncanbedoneinreal‐time,orafterthedatahasbeen

collectedbypostprocessing.

DifferentialGPSSeereal‐timedifferentialGPS.

DOPDilutionofPrecision.AmeasureofthequalityofGPSpositions,basedonthe

geometryofthesatellitesusedtocomputethepositions.Whensatellitesare

widelyspacedrelativetoeachother,theDOPvalueislower,andpositionaccuracy

isgreater.Whensatellitesareclosetogetherinthesky,theDOPishigherandGPS

positionsmaycontainagreaterleveloferror.

PDOP(PositionDOP)indicatesthethree‐dimensionalgeometryofthesatellites.

OtherDOPvaluesincludeHDOP(HorizontalDOP)andVDOP(VerticalDOP),which

indicatetheaccuracyofhorizontalmeasurements(latitudeandlongitude)and

verticalmeasurementsrespectively.PDOPisrelatedtoHDOPandVDOPas

follows:

PDOP²=HDOP²+VDOP²

dual‐frequency

GPS

AtypeofreceiverthatusesbothL1andL2signalsfromGPSsatellites.A

dual‐frequencyreceivercancomputemoreprecisepositionfixesoverlonger

distancesandundermoreadverseconditionsbecauseitcompensatesfor

ionosphericdelays.

EGNOSEuropeanGeostationaryNavigationOverlayService.Asatellite‐based

augmentationsystem(SBAS)thatprovidesafree‐to‐airdifferentialcorrection

serviceforGPS.

EGNOSistheEuropeanequivalentofWAAS,whichisavailableintheUnited

D.Glossary

N72GNSSReferenceReceiverUserGuidePage64

States.

elevationmaskTheanglebelowwhichthereceiverwillnottracksatellites.Normallysetto10

degreestoavoidinterferenceproblemscausedbybuildingsandtrees,and

multipatherrors.

ephemeris/

ephemerides

Alistofpredicted(accurate)positionsorlocationsofsatellitesasafunctionof

time.Asetofnumericalparametersthatcanbeusedtodetermineasatellite’s

position.

Availableasbroadcastephemerisoraspostprocessedpreciseephemeris.

epochThemeasurementintervalofaGPSreceiver.Theepochvariesaccordingtothe

measurementtype:forreal‐timemeasurementitissetatonesecond;for

postprocessedmeasurementitcanbesettoarateofbetweenonesecondand

oneminute.Forexample,ifdataismeasuredevery15seconds,loadingdatausing

30‐secondepochsmeansloadingeveryalternatemeasurement.

firmwareTheprograminsidethereceiverthatcontrolsreceiveroperationsandhardware.

GLONASSGlobalOrbitingNavigationSatelliteSystem.GLONASSisaSovietspace‐based

navigationsystemcomparabletotheAmericanGPSsystem.Theoperational

systemconsistsof21operationaland3non‐operationalsatellitesin3orbit

planes.

GNSSGlobalNavigationSatelliteSystem.

GSOFGeneralSerialOutputFormat.ATrimbleproprietarymessageformat.

HDOPHorizontalDilutionofPrecision.HDOPisaDOPvaluethatindicatestheaccuracy

ofhorizontalmeasurements.OtherDOPvaluesincludeVDOP(verticalDOP)and

PDOP(PositionDOP).

UsingamaximumHDOPisidealforsituationswhereverticalprecisionisnot

particularlyimportant,andyourpositionyieldwouldbedecreasedbythevertical

componentofthePDOP(forexample,ifyouarecollectingdataundercanopy).

L1TheprimaryL‐bandcarrierusedbyGPSsatellitestotransmitsatellitedata.

L2ThesecondaryL‐bandcarrierusedbyGPSsatellitestotransmitsatellitedata.

L5ThethirdL‐bandcarrierusedbyGPSsatellitestotransmitsatellitedata.L5will

provideahigherpowerlevelthantheothercarriers.Asaresult,acquiringand

trackingweaksignalswillbeeasier.

MSASMTSATSatellite‐BasedAugmentationSystem.Asatellite‐basedaugmentation

system(SBAS)thatprovidesafree‐to‐airdifferentialcorrectionserviceforGPS.

MSASistheJapaneseequivalentofWAAS,whichisavailableintheUnitedStates.

multi‐frequency

GPS

Atypeofreceiverthatusesmultiplecarrierphasemeasurements(L1,L2,andL5)

fromdifferentsatellitefrequencies.

multipathInterference,similartoghostsonatelevisionscreenthatoccurswhenGPSsignals

arriveatanantennahavingtraverseddifferentpaths.Thesignaltraversingthe

longerpathyieldsalargerpseudorangeestimateandincreasestheerror.Multiple

pathscanarisefromreflectionsoffthegroundoroffstructuresneartheantenna.

NMEANationalMarineElectronicsAssociation.NMEA0183definesthestandardfor

interfacingmarineelectronicnavigationaldevices.Thisstandarddefinesanumber

of'strings'referredtoasNMEAstringsthatcontainnavigationaldetailssuchas

positions.MostCHCGPSreceiverscanoutputpositionsasNMEAstrings.

PDOPPositionDilutionofPrecision.PDOPisaDOPvaluethatindicatestheaccuracyof

D.Glossary

N72GNSSReferenceReceiverUserGuidePage65

three‐dimensionalmeasurements.OtherDOPvaluesincludeVDOP(verticalDOP)

andHDOP(HorizontalDilutionofPrecision).

UsingamaximumPDOPvalueisidealforsituationswherebothverticaland

horizontalprecisionareimportant.

postprocessingPostprocessingistheprocessingofsatellitedataafterithasbeencollected,in

ordertoeliminateerror.Thisinvolvesusingcomputersoftwaretocomparedata

fromtheroverwithdatacollectedatthebasestation.

real‐time

differential

GPS

Alsoknownasreal‐timedifferentialcorrectionorDGPS.Real‐timedifferentialGPS

istheprocessofcorrectingGPSdataasyoucollectit.Correctionsarecalculatedat

abasestationandthensenttothereceiverthrougharadiolink.Astherover

receivesthepositionitappliesthecorrectionstogiveyouaveryaccurateposition

inthefield.

Mostreal‐timedifferentialcorrectionmethodsapplycorrectionstocodephase

positions.RTKusescarrierphasemeasurements.

WhileDGPSisagenericterm,itscommoninterpretationisthatitentailstheuse

ofsingle‐frequencycodephasedatasentfromaGPSbasestationtoaroverGPS

receivertoprovidesub‐meterpositionaccuracy.Theroverreceivercanbeata

longrange(greaterthan100km(62miles))fromthebasestation.

referencestationSeebasestation

roverAroverisanymobileGPSreceiverthatisusedtocollectorupdatedatainthe

field,typicallyatanunknownlocation.

RTCMRadioTechnicalCommissionforMaritimeServices.Acommissionestablishedto

defineadifferentialdatalinkforthereal‐timedifferentialcorrectionofrovingGPS

receivers.TherearethreeversionsofRTCMcorrectionmessages.AllCHCGPS

receiversuseVersion2protocolforsingle‐frequencyDGPStypecorrections.

CarrierphasecorrectionsareavailableonVersion2,oronthenewerVersion3

RTCMprotocol,whichisavailableoncertainCHCdual‐frequencyreceivers.The

Version3RTCMprotocolismorecompactbutisnotaswidelysupportedas

Version2.

RTKReal‐timekinematic.Areal‐timedifferentialGPSmethodthatusescarrierphase

measurementsforgreateraccuracy.

SBASSatellite‐BasedAugmentationSystem.SBASisbasedondifferentialGPS,but

appliestowidearea(WAAS/EGNOSandMSAS)networksofreferencestations.

Correctionsandadditionalinformationarebroadcastviageostationarysatellites.

signal‐to‐noise

ratio

SNR.Thesignalstrengthofasatelliteisameasureoftheinformationcontentof

thesignal,relativetothesignal’snoise.ThetypicalSNRofasatelliteat30°

elevationisbetween47and50dBHz.ThequalityofaGPSpositionisdegradedif

theSNRofoneormoresatellitesintheconstellationfallsbelow39.

skyplotThesatelliteskyplotconfirmsreceptionofadifferentiallycorrectedGPSsignaland

displaysthenumberofsatellitestrackedbytheGPSreceiver,aswellastheir

relativepositions.

SNRSeesignal‐to‐noiseratio

UTCUniversalTimeCoordinated.Atimestandardbasedonlocalsolarmeantimeat

theGreenwichmeridian.

VRSVirtualReferenceStation.AVRSsystemconsistsofGNSShardware,software,and

D.Glossary

N72GNSSReferenceReceiverUserGuidePage66

communicationlinks.Itusesdatafromanetworkofreferencestationstoprovide

correctionstoeachroverthataremoreaccuratethancorrectionsfromasingle

basestation.

TostartusingVRScorrections,theroversendsitspositiontotheVRSserver.The

VRSserverusesthereferencestationdatatomodelsystematicerrors(suchas

ionosphericnoise)attheroverposition.ItthensendsRTCMorCMRcorrection

messagesbacktotherover.

WAASWideAreaAugmentationSystem.WAASwasestablishedbytheFederalAviation

Administration(FAA)forflightandapproachnavigationforcivilaviation.WAAS

improvestheaccuracyandavailabilityofthebasicGPSsignalsoveritscoverage

area,whichincludesthecontinentalUnitedStatesandoutlyingpartsofCanada

andMexico.

TheWAASsystemprovidescorrectiondataforvisiblesatellites.Correctionsare

computedfromgroundstationobservationsandthenuploadedtotwo

geostationarysatellites.ThisdataisthenbroadcastontheL1frequency,andis

trackedusingachannelontheGPSreceiver,exactlylikeaGPSsatellite.

UseWAASwhenothercorrectionsourcesareunavailable,toobtaingreater

accuracythanautonomouspositions.FormoreinformationonWAAS,refertothe

FAAwebsiteathttp://gps.faa.gov.

TheEGNOSserviceistheEuropeanequivalentandMSASistheJapanese

equivalentofWAAS.



CHC‐ShanghaiHuaCeNavigationTechnolo gyLtd.

BuildingC,NO.599GaojingRoad,

QingpuDistrict,201702Shanghai,China

Tel: +862154260273

Fax:+862164950963

Email:sales@chcnav.com|support@chcnav.com

Website:www.chcnav.com

Huace Navigation Technology A02003 GNSS Receiver User Manual SY4 A02003 User Manual Rev2

Shanghai Huace Navigation Technology LTD. GNSS Receiver SY4 A02003 User Manual Rev2

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