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- 2017
北斗卫星伪距偏差模型估计及其对精密定位的影响
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Abstract:
现阶段北斗卫星导航系统（BeiDou navigation satellite system，BDS）的同步地球轨道（geostationary orbits，GEO）卫星、中倾斜地球同步轨道（inclined geo-synchronous orbits，IGSO）卫星和中圆地球轨道（medium earth orbit，MEO）卫星均存在伪距偏差，该伪距偏差的存在对精密定位的研究及其应用产生了较大的影响。根据北斗IGSO和MEO卫星的伪距偏差与高度角和频率相关的误差特性，本文分析了测站数目及分布，以及观测时长对建模的影响，选择18个测站2015年全年的数据作为MEO卫星的建模数据，其中可以连续观测到全弧段IGSO卫星的4个测站用于IGSO卫星的建模，采用加权分段线性拟合联合抗差估计的方法建立了北斗卫星伪距偏差改正模型。模型改正后，北斗IGSO和MEO卫星的伪距偏差得到明显的削弱，相比于传统的伪距偏差改正模型，精密单点定位（precise point positioning，PPP）的定位精度和收敛时间均得到提升
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