航天器自主高精度时间管理系统设计

摘要

For high precision time synchronization demands of long term on orbit spacecraft,an autonomous high precision time management system is proposed,which combines Beidou navigation equipment clock generator and frequency synthesizer clock generator.Two clock generators can autonomously switch by states of navigation and localization,it eliminates error accumulation effect of frequency clock generator system and solves the problem for time precision falling dramatically when Beidou navigation equipment is unable to be located.By building error model for system taking an real application in spacecraft for example,to compute and analyze,which indicates that precision of the system time synchronization is prior to 37.8 μs.The result can be a reference for subsequent design of high precision time management system spacecraft.%为满足航天器长期在轨飞行期间高精度的时间同步需求,提出了一种航天器自主高精度时间管理系统,将北斗导航定位授时设备和频率综合器两种时钟源系统进行融合使用,两种时钟源系统可根据导航定位状态自主切换,在消除了频率源系统误差累积效应问题的同时,解决了导航非定位情况下时间精度急剧下降的问题.通过建立系统的误差模型,以航天器应用设计实例进行计算分析,结果表明:系统时间同步精度优于37.8μs.研究结果可以为后续航天器高精度时间管理系统设计提供参考.