航天器多子网时间同步系统设计与验证  

Design and Verification of Multi-subnet Time-synchronization System on Spacecraft

作　　者：白崇延 邢卓异[1] 张伍[1] 黄昊[1] 朱舜杰 BAI Chongyan;XING Zhuoyi;ZHANG Wu;HUANG Hao;ZHU Shunjie(Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)

机构地区：[1]北京空间飞行器总体设计部,北京100094

出　　处：《航天器工程》2018年第2期54-61,共8页Spacecraft Engineering

基　　金：国家重大科技专项工程

摘　　要：为了保证多舱段多子网深空探测器在交会对接、着陆下降、再入返回等特定任务阶段的导航精度要求,针对探测器中各子网守时时间与地面标准时间同步的精度需求,对国内外多子网航天器典型组网方式和时间传输机制进行了研究和分析。在此基础上,文章提出了一种典型的多子网深空探测器时间同步设计方案,采用了基于上下级子网和对等子网相结合的时间同步机制,设计了时间传输机制保证时间维护和发布的精度。经过理论分析和地面试验,文章所述时间同步系统设计方案可以在无GPS卫星支持的条件下,长时间内实现时间精度的自主维护,满足深空探测任务的器地时间同步需求。该设计方案已成功应用于某多子网深空探测器并通过了验证,可为未来深空探测任务相关设计提供参考。In order to ensure navigation accuracy for mission critical phase such as rendezvous,docking,landing,descend,reentry and return of multi-segment multi-subnet deep-space explorer,and to meet subnet time and ground standard time synchronization accuracy requirements,the typical networking modes and time transmission mechanisms of multi-subnet explorer at home and aboard are studied and analyzed.This paper presents a typical design of time-synchronization system in multi-subnet deep-space explorer,the program uses superior/subordinate subnet and peer-to-peer subnet combined topology,the time transmission mechanism is designed to ensure the time accuracy.Through theoretical analysis and ground verification test,the correctness of time-synchronization system design is validated,which shows a higher level time accuracy onboard can be maintained over a long time without GPS support.The design has been successfully applied in the development process of a multi-subnet deep space explorer and passed the verification,and can provide a reference for future deep space exploration mission design.

关 键 词：多子网 深空探测器 时间同步系统 上下级子网 对等子网 

分 类 号：V476[航空宇航科学与技术—飞行器设计]