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