基于TIN全球选站方法的GPS卫星钟差实时解算

解算所有GPS卫星钟差时要求选用地面跟踪站能够观测到每颗卫星,而组成该网的跟踪站数量对卫星钟差的解算效率有较大影响。跟踪站数量越多,卫星钟差的解算效率就越低,不利于实时应用。本文利用不规则三角网对全球跟踪站进行建模,提出一种新的全球均匀选站方法,并应用于卫星钟差实时解算。试验结果表明:当跟踪站个数达到25个时,卫星钟差解算精度优于0.3 ns,且随着跟踪站的增加,精度无明显提升。此跟踪站分布可作为卫星钟差实时解算的一种选站分布参考。

Real-Time GPS Satellite Clock Offset Determination Based on the TIN Global Station-Selecting Method

Every GPS satellite must be tracked by selected ground tracking stations in processing of GPS satellites clock offset determination.The quantity of ground tracking stations can impact on the efficiency of the satellite clock offset determination.The more the quantity of ground tracking stations is,the lower the data processing efficiency is,and it is not be benefit to the real-time applications.In the paper,a new global station-selecting method is proposed by the principle of triangulated irregular network topology and applied in the real-time GPS satellite clock offset determination.The results show the accuracy of all satellites real-time clock offset can be better than 0.3 ns when the number of stations is 25,and it is not obviously improved with the increase of number of the tracking stations.This is a good station-selecting method in the real-time satellite clock offset determination.