Petovello--Choosing the Coherent Integration Time for Kalman Filter Based Carrier Phase Tracking of GNSS Signals

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1、GPSSolut(2011)15:345356DOI10.1007/s10291-010-0194-4ORIGINALARTICLEChoosingthecoherentintegrationtimeforKalmanfilter-basedcarrier-phasetrackingofGNSSsignalsCillianO’Driscoll•MarkG.Petovello•Ge´rardLachapelleReceived:2June2010/Accepted:10November2010/Publishedonline:9December2010Ó

2、Springer-Verlag2010AbstractCarrierphasebasedpositioningusingGlobalIntroductionNavigationSatelliteSystem(GNSS)signalscanprovidecentimeter-levelaccuracy;however,todosorequiresHigh-sensitivityGNSS(HSGNSS)receiversarecapableofrobust,continuoustrackingofthephaseofthereceivedprovidin

3、gpseudorangemeasurementsforsatellitesignalssignal.Thephase-lockedloopistypicallytheweakestlinkattenuatedbyupto30dBormore.Althoughimpressive,inGNSSsignalprocessing,withfrequentcycleslipsandsuchreceiversaregenerallyoflimitedbenefittoapplica-lossoflockoccurringatlowersignal-to-nois

4、eratios.Onetionsrequiringcentimeterreal-timekinematic(RTK)waytoimprovethesignal-to-noiseratioistoincreasepositioningthatrequirescontinuousandhigh-qualitycar-thecoherentintegrationtime;howeverdoingsoreducesrier-phasemeasurementsinthesame(orsimilar)degradedtheloopupdaterate,there

5、bydegradingperformance.Thisenvironments.Unfortunately,trackingrequirementsforthepaperinvestigatesthistrade-offbetweensensitivityandcarrierphasearemuchmorestringentthanthoseforloopupdateratebyinvestigationoftheKalmanfilter-basedpseudorangeorcarrierfrequency,andlossofcarrierphaset

6、rackingloop.Itisshownthatitispossibletochooseanlockislikelywhenthereceivedsignalsareweakerthanoptimalintegrationtimeforagivenapplication.Arela-normal.Assuch,RTKpositioninghastraditionallybeentivelystraightforwardprocedureisgiventodeterminethisreservedforenvironmentswheretheGNSS

7、signalsoptimalvalue.Theresultsareconfirmedthroughreal-timereceivedattheusersantennahaveminimalattenuation.kinematicprocessingoflivesatellitesignals.InmostGNSSreceivers,thecarrier-phasemeasurementisobtainedusingaphasetrackingloop(vanDierendonckKeywordsGNSS
Ultra-tightintegration

8、Coherent1996;Wardetal.2006),whichisessentiallyadynamic