北斗卫星伪距多路径偏差改正研究

通过分析不同卫星系统MEO卫星的伪距多路径误差，发现北斗卫星伪距多路径偏差的存在。进一步分析BDS三类卫星伪距多路径误差的变化特征，结果表明，IGSO卫星和MEO卫星的伪距多路径误差存在明显的系统性偏差。选择分段线性拟合和分段多项式拟合两种方法建立北斗卫星伪距多路径偏差改正的经验公式，并比较两种改正方法的效果。分析了北斗卫星伪距多路径偏差改正前后的MP序列和MW组合序列的数据变化特征以及PPP定位结果的差异，验证了经验公式的可行性和有效性。

Methods of Beidou Pseudorange Multipath Deviation Correction

By analyzing and comparing the MEO satellite pseudorange multipath effect from different satellite system to determine the existence of Beidou satellite pseudorange multipath deviation; further analysis of the BDS three kind of satellite’s pseudorange multipath effect found that IGSO satellite and MEO satellites exist obvious multipath deviation; selecting piecewise linear approximation and piecewise polynomial fitting two methods to build the empirical formula to correct Beidou satellite pseudorange multipath deviation and compared the effects of two methods; by analyzing the characteristics of the MW series and the results of PPP before and after the error correction to demonstrate the effectiveness of empirical formula.