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- 2018
北斗卫星导航系统混合星座的光压摄动建模和精度分析
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Abstract:
卫星帆板及本体受照情况变化复杂，导致卫星光压摄动力的变化难以准确模制，既是动力学定轨的最大误差源，也是定轨预报精度降低的主要原因。针对此问题，采用北斗地面系统的区域监测网数据，详细比较了3种主要的经验模型（T20模型、ECOM5参数模型、ECOM9参数模型）对不同卫星的适用性情况。结果显示，在春秋分前后，地球同步轨道（geosynchronous earth orbit，GEO）卫星使用ECOM9参数模型最好，其解算的卫星钟差与星地双向钟差的互差标准差优于2 ns；对于倾斜地球同步轨道（inclined geosynchronous satellite orbit，IGSO）卫星和中地球轨道（medium earth orbit，MEO）卫星，无论是在动偏期间还是姿态模式转换期间，T20模型表现出更好的适用性。不同于此前国内外学者的相关研究，试验表明，对BDS混合星座的不同类型卫星、同一卫星的不同时段，应采用不同的经验太阳光压模型，以获得更高的定轨和预报精度
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