›› 2012, Vol. 32 ›› Issue (5): 34-39.doi: 10.3780/j.issn.1000-758X.2012.05.006

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ModelingMethodforOscillatorFlickerNoiseinKalmanbasedGPSTrackingLoop

JIN  Tian, WANG  Li-Hua, HUANG  Bing-Sheng   

  1. (SchoolofElectronicInformationandEngineering,BeihangUniversity,Beijing100191)
  • Received:2012-03-28 Revised:2012-05-06 Online:2012-10-25 Published:2012-10-25

Abstract: FrequencydriftcausedbyoscillatorwillpollutecarrierphaseandDopplerfrequencyinGPSreceiver.Therefore,itisnecessarytomodeltheoscillatorerrorinthetrackingsystem.TheflickernoiseerrorofoscillatorcannotbeexactlymodeledinKalmansystem,whichcauseserrorsinthemodeloftraditionalKalmanbasedtrackingloop.Tosolvetheseproblems,thefrequencydomainmodelandnoisecovarianceofoscillatorwereanalyzed,andamethodofexactlymodellingtheflickernoiseintheKalmanbasedtrackingloopwasproposed.RealGPSsatellitedatawasprocessedbyusingthenewoscillatormodeltoverifythevalidity.

Key words: Trackingloop, Crystaloscillatornoise, Kalmanfiltering, Errormodeling, Globalpositioningsystem