HXMT-1卫星时间同步系统设计

The Design and Verification of time synchronization system of HXMT-1 Satellite

摘要:

硬X射线调制望远镜（Hard X-ray Modulation Telescope ，简称HXMT）卫星是国内首颗空间天文卫星，用于实现宽波段、大视场X射线巡天观测和成像。为实现高灵敏度、高分辨率的空间X射线成像，满足卫星平台和有效载荷对高精度卫星时间同步的需求，设计了适用于空间科学试验卫星的卫星时间同步系统，包括一般精度时间和高精度时间同步，通过GPS校时、遥控校时、星时总线广播和GPS硬件秒脉冲输出等多种方式对卫星时间进行维护。文章在对时间同步系统进行详细介绍的同时，结合星地测控对接试验结果和卫星在轨测试结果，对卫星时间同步系统的应用情况进行了说明。

Abstract:

HXMT（Hard X-ray Modulation Telescope）is the first space science satellite in China. It is used for wide band and wide field X ray observation. In order to realize high sensitivity and high resolution X ray imaging and meet the demand of high precision satellite time by users, the general precision and high precision time synchronization suitable for space science satellite is designed. The satellite time is maintained through GPS time, bus broadcasting and Hardware second pulse output. The time synchronization system is explained in detail in this paper, and the application of time synchronization system is explained in the matching test of satellite and TT&C station, and on orbit test results.