BDS-2和BDS-3卫星伪距多路径偏差特性比较

Comparison of Satellite-Induced Code Bias between BDS-2 and BDS-3 Satellites

通过分析2016-07-01JFNG测站BDS-2卫星伪距多路径组合(MP组合)的特征,证实BDS-2卫星的伪距观测值存在与卫星高度角有关的伪距多路径偏差,且该偏差与卫星类型和信号频率有关。利用SGG0站2017-07-10~07-20的数据计算BDS-3卫星的MP序列,通过三次多项式拟合建立每一颗卫星在各个频率上的高度角模型发现,对应的系数接近0,说明BDS-3卫星伪距观测值几乎不存在伪距多路径偏差。

By analyzing the multipath （MP） combination of BDS-2 satellite, the code bias of BDS-2 satellites is confirmed as elevation, satellite, and frequency dependent. For BDS-3 satellites, the MP combination is calculated and the elevation-dependent model is developed for each satellite on different frequencies by the polynomial fitting method. The observation data of BDS-2 satellites are from IGS station JFNG, while the data of BDS-3 satellites are from self-test data SGG0. The results of BDS-3 satellites show that the code bias is ignorable.