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- 2018
星载GPS伪距多路径误差与观测噪声对自主定轨的影响分析
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Abstract:
对搭载美国BlackJack接收机的CHAMP/GRACE-A/Jason-2卫星和搭载国产接收机的HY2A/ZY3/TH1卫星的星载GPS数据的伪距多路径误差与观测噪声进行了研究，重点分析了国产接收机伪距多路径误差的变化特性，并研究了多路径误差与观测噪声对星载GPS自主定轨的影响。结果表明：国产接收机的C/A码与P1码伪距观测精度要整体差于美国的BlackJack接收机，而P2码伪距观测精度要整体优于BlackJack接收机；国产接收机P1码伪距受多路径效应影响较大，其多路径误差随高度角减小存在单调递增的变化趋势，其中HY2A、ZY3与TH1卫星的多路径误差最大分别可达3.6 m、1.8 m与0.7 m；这种单调递增变化的多路径误差会导致星载GPS自主定轨位置结果在径向与切向产生系统性偏差
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