摘要
设计一种星相机高精度校时计时方法,星相机通过调节自身设备时钟使其与卫星时标严格对准,并精确记录对准误差,以实现与卫星同步信号的时间同步精度优于1μs,解决传统只记时不校时的时间同步方法存在较大系统误差的问题。通过时间同步误差分析和测量对校时计时方法进行验证,结果表明:时间同步误差最大值为880ns,可保证2台星相机与卫星平台之间的高精度时间同步,对提高测绘定位精度具有应用价值。
A high precision time correction and calculation method is designed. The star camera adjusts its own equipment clock to make it strictly align with the satellite time scale. The alignment error is recorded accurately, and the precision of synchronization signal with satellite is better than 1 μs, which solves the problem of large system error existing in the traditional time synchronization method which only records the time but does not adjust the time. The method proposed is verified by analysis and measurement of time synchronization error, and the results show that the maximum time synchronization error is 880 ns. Thus, the high precision time synchronization between the two star cameras and the satellite platform is guaranteed, which has great application value for improving the precision of surveying and mapping.
作者
宗云花
于艳波
邸晶晶
任宇宁
刘晓鹏
王伟之
ZONG Yunhua;YU Yanbo;DI Jingjing;REN Yuning;LIU Xiaopeng;WANG Weizhi(Key Laboratory for Space-Based Target Monitoring Technology of China Academy of Space Technology, Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China)
出处
《航天器工程》
CSCD
北大核心
2019年第2期36-42,共7页
Spacecraft Engineering
基金
国家重点研发计划地球观测与导航重点专项(2016YFB0500802)
关键词
星相机
控制同步器
高精度校时计时
本地时钟同步校正
star camera
control synchronizer
high precision time correction and calculation
local clock synchronization correction
