随着航天活动的开展，空间碎片环境严重地威胁着在轨航天器的安全运行。
With the increase of the human aerospace activities, space debris environment is seriously threatening in-orbit spacecraft safe operation.
航天器在轨自主进行热故障诊断对其顺利完成任务具有非常重要的意义。
It is important that the spacecraft can do the thermal fault diagnosis automatically when in orbit.
在自由飞行段，分析了追踪航天器估计状态误差的先验值和测轨误差对状态误差传播的影响。
In the free flight segment, effects on the state error propagation caused by prior state estimation errors and orbit determination errors of the chasing spacecraft were studied.
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