实践十号返回卫星时间同步系统设计与验证

摘要

Based on the characteristics of reentry satellite,there are two kind of time synchronization mode across the flight time.First,the combination of reentry capsule and apparatus capsule time mode.Second,apparatus capsule time mode.As a result,the key point is how to design the time system of the reentry satellite,and how to meet all the goals of the two time mode.The time system of reentry satellite includes time generation,time calibration,time broadcasting and time transmission.The design of time system aims at meeting the demand of time synchronization for the time users.This paper mainly discusses time synchronization demand,time-management model,time system architecture,the design of time system and the test verification of time system for the satellite.%根据返回式卫星的特点,卫星在轨飞行包括两个阶段的时间同步工作模式:1)“返回舱和仪器舱在轨段组合体”时间模式;2)两舱分离后,“仪器舱留轨段”时间模式;因此,如何设计返回式卫星的时间系统,并进行优化使其在不同阶段完成不同任务,是返回式卫星时间系统设计的关键点;返回式卫星时间包括时间产生、时间维护、时间发布及时间传输;返回式卫星时间系统设计就是为了满足时间用户对时间同步精度的需求,通过特定方法和必要手段对星上时间产生、维护和发布机制进行相应的系统设计;针对实践十号返回式科学实验卫星时间同步需求、时间管理模型、时间系统架构以及时间系统的设计进行了说明,并对卫星在整星电测以及在轨运行的验证情况进行说明.