星地距离变化对星地双向时间比对的影响及改正  

The Influence and Correction of Satellite-to-ground Range Variation on Two-way Time Comparison between Satellite and Ground Station Clocks

作　　者：王威[1] 魏立栋[1] 范国清[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,湖南长沙410073

出　　处：《国防科技大学学报》2010年第2期23-26,45,共5页Journal of National University of Defense Technology

基　　金：国家863计划资助项目(2007AA12Z307)

摘　　要：星地时间同步是卫星导航系统的关键技术,星地双向时间比对能有效提高星地时间同步的精度。在分析了星地距离变化对星地双向时间比对可引起百纳秒量级误差后,提出了前后历元观测数据差分改正方法,通过数学仿真验证该方法能达到纳秒量级精度。Satellite and ground station time synchronization is the key technology of navigation satellite system. Two-way time comparison method between satellite and ground station clocks can improve the accuracy of satellite and ground station time synchronization effectively. By analyzing the influence of sateUite-to-ground station range variation on two-way time comparison, which is the source of hundred nanoseconds error, a method of observe data differential correction was presented. Numerical simulation performed later shows that this method can reach the level of nanosecond precision.

关 键 词：星地双向时间比对 星地钟差 卫星导航系统 

分 类 号：P228[天文地球—大地测量学与测量工程]