近地卫星测控中的一种GPS时间同步方法  

GPS Time Synchronization for LEO Satellite in TTC

作　　者：李强 张波[2] 宋仁庭[2] 岳路 LI Qiang;ZHANG Bo;SONG Renting;YUE Lu

机构地区：[1]宇航动力学国家重点实验室,西安710043 [2]西安卫星测控中心,西安710043

出　　处：《现代导航》2017年第5期338-342,共5页Modern Navigation

摘　　要：针对近地卫星测控中的星地时间同步问题,首先建立星地时差模型,在重点分析星地时差误差源的基础上,提出使用星载GPS接收机的时间信息对卫星时间进行同步,并建立GPS时间同步模型,从理论上对星地时差进行误差源的比较和分析,最后应用于近地卫星测控。结果表明,利用GPS的星地时间同步方法的误差源少,时间同步精度高,误差在±1ms以内,精度优于1ms,并施用于在轨卫星长期管理与测控。With respect to time synchronization of LEO(Low Earth Orbit)satellite platform in TTC(Tracking,Telemetry andCommand),a traditional model has presented to calculate the time difference from satellite to the ground.By analyzing the errorsources that are six in the traditional model,the traditional model has modified to be a new GPS(Global Positioning System)timesynchronization model to calculate the time difference from satellite to GPS with telemetry information originated from the satellite.Validation in TTC has shown that the GPS(Global Positioning System)time synchronization model has an error source decreasing totwo,and has a time error within1ms and a time precision less than1ms,and is applicable to long-term management for on-orbitsatellite in TTC.

关 键 词：时间同步 GPS 测控 近地卫星 遥测 

分 类 号：TN967[电子电信—信号与信息处理]