GEO卫星对BDS相对定位性能的影响分析

对BDS高精度相对定位中GEO卫星的影响进行研究和分析。首先实现非差观测模型的BDS定位解算，在非差观测模型的基础上实现BDS高精度相对定位解算模型，然后分别利用全星座卫星和IGSO+MEO组合进行高精度相对定位处理，分析GEO卫星对BDS相对定位收敛时间和定位精度以及PDOP值的影响。结果表明，GEO卫星能稳定增加观测卫星数量，改善PDOP值，提高定位收敛速度和精度，BDS全星座高精度相对定位静态单天解与动态解均达到或优于cm级。

Analysis of GEO Satellites on BDS High-Precision Relative Positioning Performance

The influence of GEO satellites in BDS high precision relative positioning is studied and analyzed. First, the BDS un-differential observation model is realized, the high precision relative positioning solution model of BDS is derived on this basis. Then, the whole constellation satellites and IGSO+MEO satellites combination are used to carry out in high precision relative positioning processing. Finally, the influence of GEO satellites on BDS relative positioning convergence time, positioning accuracy and PDOP values are further analyzed. The results show that the BDS GEO satellites are beneficial to increase the number of observation satellites, and significantly improve the geometry of the observation satellites and the positioning convergence speed and accuracy. Both the static and dynamic results of the whole constellation satellites of high precision relative positioning are at or better than centimeter level.