广播星历等效伪距误差在中国区域的建模分析

Analysis and Modeling for Characteristic of Broadcast Ephemeris' Equivalent Pseudo-range Error in China Region

在卫星导航系统服务区域内,由广播星历产生的等效伪距误差随用户位置的改变发生变化。将服务区域内用户的位置在切平面上投影,可以对服务区域内用户的星历等效伪距误差的特性分析加以简化。通过对GEO、MEO和IGSO三种导航卫星的分析,中国区域内的星历等效伪距误差可以用一个平面方程进行表示。研究结果对星历等效伪距误差模型及其改正方法的建立具有一定的参考价值。

In the service region of satellite navigation system, the equivalent pseudo-range error due to broadcast ephemeris varies with the change of user＇s position. Through the projection of user＇s position in service region on the tangent plane, the characteristic of user＇s ephemeris＇ equivalent pseudo-range error can be simply analyzed. By the analysis of GEO, MEO and IGSO satellites, the characteristic of ephemeris＇ equivalent pseudo-range error in China region can be represented by a plane＇s equation. The research result can provide reference for the establishment of ephemeris＇ equivalent pseudo-range error＇s model and correction method.