›› 2017, Vol. 37 ›› Issue (2): 101-109.doi: 10.16708/j.cnki.1000-758X.2017.0015

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GNSSreceivertechniquesbasedonhighearthorbitspacecraft

 GAO  Yang*, WANG  Meng, LIU  Lei, CHE  Huan, ZHANG  Qian   

  1. BeijingInstituteofSatelliteInformationEngineering,Beijing100086,China
  • Received:2016-08-25 Revised:2017-01-11 Online:2017-06-25 Published:2017-01-24

Abstract: ThevisibilityofGlobalNavigationSatelliteSystem(GNSS)appliedinhigh-Earthorbitaltitudesdramaticallyreduces,whilespacesignalpowerlevelisweak,andfastsignalacquisitionandtrackingbecomesverydifficult.ForGNSSreceivertechniquesresearch,GNSSsignalscharacteristicsandavailabilitywereanalyzedinChina′sGEOSJ-17satellite.Antennapatternwasfromtheofficialrelease.Andforhigh-Earthorbitspacecraft′sGNSSweaksignalscharacteristics,GNSSreceiverusedlong-timeintegrationcombfiltermethodtoacquire,tookdifferentialcoherentbitsynchronizationmethodtotrackandusedextendedKalmanfilterorbitdeterminationbasedondynamics.Finally,hardware-in-the-looptestsshowthatGNSSreceiver′sacquisitionsensitivityisbetterthan-173dBW,trackingsensitivityisbetterthan-175dBW,thepositionaccuracyoforbitdeterminationisbetterthan50m,andthevelocityisbetterthan0.01m/s.

Key words: GlobalNavigationSatelliteSystem, geosynchronousEarthorbit, highsensitivity, receiver