基于1553B总线的卫星星时高精度自主恢复设计

Satellite Time Precise Auto-Recovery Design Based on MIL-STD-1553 Bus

摘要:

随着现代航天器功能日趋复杂，在轨任务不断变化，星上各个系统对于时间的依赖性也随之不断提高，为此也对星上时间管理的可靠性、安全性提出了较高的要求。为了实现地球同步轨道卫星和深空探测卫星等无法携带GPS接收机的航天器在异常情况下的星时自主恢复，文章提出了一种基于1553B总线的星时高精度自主恢复方案，利用制定的软件协议，在不额外增加硬件开销的前提下，实现了星时自主恢复。经过实验验证方案可行，实现了高精度的星时自主恢复。此方法，能够有效减少对地面人工干预的依赖，并能够有效的保证在意外情况下星载数据管理计算机工作的连续性，大大提高了卫星时间管理系统在星载数据管理计算机出现复位或切机等异常情况下的可用性，在实际工程中具有一定的实用价值。

Abstract:

With the increasing complexity and the variety of spacecraft functions and tasks, the dependence on satellite time has been improved for various on-board systems of spacecraft. Therefore, the higher reliability and safety requirements have been brought to the satellite time management function. This paper introduces the generation and data structure of satellite time, general method of satellite time management and the principle of the satellite time auto-recovery in the exceptional circumstance. Finally, a satellite time precise auto-recovery design based on MIL-STD-1553 bus has been brought forward for the spacecraft that cannot carry the GPS receiver, such as GEO satellite and space exploration satellite.