GNSS導(dǎo)航系統(tǒng)參數(shù)監(jiān)控

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MonitoringandAssessment

ParametersonGNSS

Draft

September,2012

Contents

TOC\o"1-4"\h\z\u

1Scope

1

2GNSSMonitoringandAssessmentParameters

1

2.1ConstellationStatus

1

2.1.1SatelliteOperationalstatus

1

2.1.2OrbitParameters

1

2.1.3DOP

1

2.2NavigationSignal

2

2.2.1User-ReceivedSignalLevel

2

2.2.2PowerSpectrum

2

2.2.3RangingCodeWaveformintheTimeDomain

2

2.2.4ModulationError

2

2.2.5CorrelationCharacteristics

3

2.3NavigationMessage

4

2.3.1NavigationMessageStatus

4

2.3.2OrbitAccuracyofBroadcastEphemeris

4

2.3.3ClockOffsetAccuracyofBroadcastEphemeris

4

2.3.4Signal-In-SpaceUserRangingError(SISURE)

4

2.3.5Signal-In-SpaceContinuity

4

2.3.6Signal-In-SpaceAvailability

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2.3.7Signal-In-SpaceMissedAlarmRate

5

2.3.8UserRangingRateError(URRE)

5

2.3.9UserRangingAccelerationError(URAE)

5

2.3.10BroadcastIonosphericDelayModelAccuracy

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2.3.11TGDAccuracy

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2.3.12Inter-SystemBias(ISB)Accuracy

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2.3.13SystemTimePerformance

6

2.3.14UTCOffsetError(UTCOE)

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2.3.15CoordinateTransformationParameters

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2.4ServicePerformance

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2.4.1Position,VelocityandTiming(PVT)Accuracy

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2.4.2Continuity

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2.4.3Availability

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2.4.4Integrity

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3References

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Appendix

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1Scope

ThisdocumentismainlyaimedtoproposeGNSSmonitoringandassessmentparametersthroughelaboratingtheirdefinitionsandfunctions,whichcanbeappliedtothemonitoringandassessmentofinternationalGNSSOpenServices.

2GNSSMonitoringandAssessmentParameters

2.1ConstellationStatus

2.1.1SatelliteOperationalstatus

1)Definition:Thetotalnumberofsatellitescurrentlyinserviceandthehealthystateofeachsatellite.

2)Function:Basiccriterionformarkingtheavailabilityofsatellites.

2.1.2OrbitParameters

1)Definition:Ephemerisparametersfordescribingsatellitepositionandvelocity.

2)Function:Tomonitorspatialdistributionoftheconstellation.

2.1.3DOP

Definition:Dilutionofprecision,includingGDOP,PDOP,TDOP,HDOPandVDOP,describesthespatialgeometricdistributionbetweenthevisiblesatellitesandusers..

2)Function:ToMonitorandevaluatetheperformanceofconstellationconfiguration.

2.2NavigationSignal

2.2.1User-ReceivedSignalLevel

1)Definition:User-receivedpowerofsatellitenavigationsignal.

2)Function:ToMonitorandevaluatestrengthandvariationrangeofthereceivedsignalontheground

2.2.2PowerSpectrum

1)Definition:Powerdistributionofnavigationsignalsinthefrequencydomain.

2)Function:ToMonitorandevaluatetheamplitudeandfrequencydistortionofnavigationsignals.

2.2.3RangingCodeWaveformintheTimeDomain

1)Definition:Rangingcodeamplitudevariationovertime.

2)Function:Tomonitorandevaluatewaveformdistortionoftherangingcodeinthetimedomain.

2.2.4ModulationError

1)Definition:Errorsgeneratedintheprocessofnavigationsignalmodulationandtransmission,mainlyincludingphasemodulationerrorandamplitudemodulationerror.

(1)Phasemodulationerror:Phasedifferencebetweenthereceivedandidealnavigationsignalsofeachchannel.

(2)Amplitudemodulationerror:Amplitudedifferencebetweenthereceivedandidealnavigationsignalsofeachchannel.

2)Function:Tomonitorandevaluatephaseandamplitudedistortiongeneratedintheprocessofnavigationsignalmodulationandtransmission.

2.2.5CorrelationCharacteristics

1)Definition:Outputsofcorrelationpeakamplitudeandcorrelationcurvecharacteristicsaftertheoperationofsignalcorrelation.

Theamplitudeandwaveformfeaturesoftheoutputcorrelationpeakofthesignalaftercorrelationcalculation.

(1)Correlationloss:Powerdifferencebetweentheactuallyreceivedsignalandtheidealsignalinthedesignedbandwidthofthesignal.

(2)Correlationcurve:Thecurveobtainedthroughcorrelationcalculationbetweenrecoveredrangingcodeandtheidealrangingcodeofallsignals

2)Function:Toevaluateamplitudeattenuationofthecorrelationoutputanddistortionofthecorrelationcurvecausedbywaveformdistortionofthesignalchip.

2.3NavigationMessage

2.3.1NavigationMessageStatus

1）Definition:Theconsistencyand

rationality

betweenthenavigationmessageandICDspecifications.

2）Function:Toevaluatethestateofthenavigationmessage.

2.3.2OrbitAccuracyofBroadcastEphemeris

1）Definition:Statisticsoforbitdifferencebetweenthebroadcastephemerisandpreciseephemeris.

2）Function:Toevaluateorbitaccuracyofthebroadcastephemeris.

2.3.3ClockOffsetAccuracyofBroadcastEphemeris

1）Definition:Statisticsofclockoffsetdifferencebetweenthebroadcastephemerisandpreciseephemeris.

2）Function:Toevaluateclockoffsetaccuracyofbroadcastephemeris.

2.3.4Signal-In-SpaceUserRangingError(SISURE)

1）Definition:Theuser'sline-of-sighterrorcausedbybroadcastephemeriserror.

2）Function:ToevaluatetheaccuracyofSignal-In-Space.

2.3.5Signal-In-SpaceContinuity

1）Definition:TheprobabilitythatUREdoesn’texceedthethresholdwithoutinterruptionoveraspecifiedtimeinterval.

2）Function:ToevaluatethecontinuityofSignal-In-Space.

2.3.6Signal-In-SpaceAvailability

1）Definition:TheprobabilitythatUREdoesn’texceedthethresholdoveraspecifiedtimeinterval.

2）Function:ToevaluatetheavailabilityofSignal-In-Space.

2.3.7Signal-In-SpaceMissedAlarmRate

1）Definition:TheprobabilitythatnoalarmingissuedwhenSISUREexceedsthethreshold.

2）Function:TomonitorandevaluatetheintegrityofSignal-In-Space.

2.3.8UserRangingRateError(URRE)

1）Definition:Thefirst-orderderivativeofUREversustime.

2）Function:TodescribethechangingrateofURE.

2.3.9UserRangingAccelerationError(URAE)

1）Definition:Thesecond-orderderivativeoftimeversusURE.

2）Function:TodescribethechangerateofURRE.

2.3.10BroadcastIonosphericDelayModelAccuracy

1）Definition:Statisticaldifferencebetweenthebroadcastandrealionosphericcorrection.

2）Function:Toevaluateaccuracyofthebroadcastionosphericdelay.

2.3.11TGDAccuracy

1）Definition:TheaccuracyofGroupDelayTime（TGD）parametersinbroadcastephemeris.

2）Function:ToevaluatetheaccuracyandstabilityofTGDparametersinbroadcastephemeris.

2.3.12Inter-SystemBias(ISB)Accuracy

1）Definition:Thesystemtimebiasanditsaccuracyamongdifferentsatellitenavigationsystems.

2）Function:Toevaluatetheaccuracyoftimebiasamongsatellitenavigationsystems.

2.3.13SystemTimePerformance

1）Definition:Theperformanceofsystemtimeofsatellitenavigationsystems,usuallyincludingaccuracyandstability.

2）Function:Toevaluatethetimeperformanceofeachsatellitenavigationsystem.

2.3.14UTCOffsetError(UTCOE)

1）Definition:TheoffseterrorbetweensystemtimeofsatellitenavigationsystemsandUTC.

2）Function:Toevaluatethesystemtimeperformanceofsatellitenavigationsystems.

2.3.15CoordinateTransformationParameters

1）Definition:Thetransformationrelationsamongthecoordinatesystemofdifferentsatellitenavigationsystems.

2）Function:Tomonitorcoordinatedatumtransformationrelationsamongdifferentsatellitenavigationsystems.

2.4ServicePerformance

2.4.1Position,VelocityandTiming(PVT)Accuracy

1)Definition:TheactuallyachievePVTaccuracybyusers.

2)Function:Toserveasservicereferenceforusers.

2.4.2Continuity

1)Definition:Thecapabilityofasatellitenavigationsystemtoprovidecontinuousserviceswithincertaintimeperiodandservicearea.

2)Function:Toevaluatethecontinuityofsystemservice.

2.4.3Availability

1)Definition:Thepercentageoftimethatthenavigationsystemisabletoprovidenominalaccuracywithinitsservicearea.

2)Function:Toevaluatetheavailabilityofsystemservice.

2.4.4Integrity

1)Definition:Thecapabilitytoissuetimelyalertswhenthesystemperformancecannotmeetnominalindicators.

2)Function:Toevaluatetheintegrityofsystemservice.

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3References

GlobalPositioningSystemStandardPositioningServicePerformanceStandard,Version4,September2008.

GPSCivilMonitoringPerformanceSpecification,April2009.

EuropeanGNSS(Galileo)OpenServiceSignalInSpaceInterfaceControlDocument(OSSISICD)Issue1.1,October2010.

GlobalNavigationSatelliteSystem(GLONASS)InterfaceControlDocument,Version5.1,2008.

IS-GPS-200E(NavstarGPSSpaceSegment/NavigationUserInterfaces),August2010.

ICD-GPS-240A(NavstarGPSControlSegmenttoUserSupportCommunityInterfaces),October2010.

IS-GPS-705A(NavstarGPSSpaceSegment/UserSegmentL5Interfaces),June2010.

IS-GPS-800A(NavstarGPSSpaceSegment/UserSegmentL1CInterface),June2010.

WenhaiJiao,QunDing,JianwenLi,etal.MonitoringandAssessmentofGNSSOpenServices.TheJounalofNavigation(2011),64,S19-23,doi:10.1017S0373463311000385.

LuXC,ZhouHW.MethodsofanalysisforGNSSsignalquality(inChinese).SciSinPhysMechAstron,2010,40(5):528–533.

Anton,John,Hessin,Robert,Sapp,Joseph,Conley,Rob,"DevelopmentofNewGPSPerformanceStandards,"Proceedingsofthe14thInternationalTechnicalMeetingoftheSatelliteDivisionofTheInstituteofNavigation(IONGPS2001),SaltLakeCity,UT,September2001,pp.26-