BDS-3卫星伪距偏差及多路径误差分析

BDS-3 Satellite Pseudo-Range Bias and Multi-Path Error Aanalysis

卫星伪距偏差对卫星精密定位的实现及其应用会产生较大的影响,为了探究BDS-3卫星伪距观测值是否存在伪距偏差,正确评价BDS-2和BDS-3各频率信号伪距观测值多路径误差,推导了可以度量多路径及噪声的无几何和无电离层的多路径组合(MP)观测量,并利用全球均匀分布的43个MGEX测站的观测数据,计算分析了多路径误差与卫星高度角的关系,对比分析了BDS-2和BDS-3不同频率信号伪距多路径的特性,统计了多路径误差的均方根,结果表明BDS-3伪距多路径误差明显小于BDS-2,验证了BDS-3卫星伪距观测值中不存在与卫星相关的伪距偏差。

Satellite pseudo-range bias will have a significant impact on the implementation and application of satellite precision positioning.In order to explore whether there is pesudorange bias in BDS-3pseudo-range observations,and evaluate the multi-path error of pseudo-range observations of BDS-2 and BDS-3 correctly,the formulas for measuring multipath and noise are derived,the observed data of 43MGEX stations with uniform global distribution are selected as experimental data,the relation between multipath error and satellite altitude angle is calculated and analyzed,and comparative analysis was conducted on the characteristics of pseudo-range multipath of BDS-2and BDS-3signals with different frequencies,the root mean square of multipath error is calculated and analyzed statistically,the analysis results show that the BDS-3pseudo-range multi-path error is obviously smaller than that of BDS-2.It is verified that there is no satellite-related pseudo-range bias in BDS-3pseudo-range observations.