北斗卫星多路径系统偏差改正的研究

Correction of BeiDou Satellite Pseudorange Multipath Deviation

现阶段北斗卫星导航系统的IGSO（inclined geosynchronous satellite orbit）卫星以及MEO（medium earth orbit）卫星的多路径误差均存在系统偏差,该多路径系统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卫星的多路径系统偏差与高度角和频率相关的误差特性,选择15个IGS测站2015年1~6月的观测数据,针对不同类型的卫星和频率对多路径系统偏差进行建模改正,建模方法采用多项式拟合法,从而建立北斗IGSO和MEO卫星在B1和B2频率下的伪距改正模型,并通过MP（multipath combination）序列的改正效果和SPP（single point positioning）结果验证了改正模型的有效性。

According to the error characteristics of multipath system deviation of BeiDou IGSO（inclined geosynchronous satellite orbit）and MEO（medium earth orbit）satellites are related to the height angle and frequency,the observation data of 15 IGS stations during Jan.-June,2015 are selected to correct pseudorange multipath deviation for different types of satellites and frequency,and the modeling method adopts polynomial fitting method.Therefore,the pseudorange correction model of BeiDou IGSO and MEO satellites in the frequency of B1 and B2 is established.The correction effect of MP（multipath combination）series and the results of SPP（single point positioning）verify the effectiveness of correction model.