介绍了利用改进时序模型提取空间飞行器推进系统特征参数的方法。利用此方法,结合某飞行器推进系统试验的实测数据,提取出了相应的特征参数,并以此为基础得出了故障判据的阈值。数据回访表明此阈值较领域专家提供的阈值对“泄漏”故障更为敏感,结合多参数辅佐检测,可以很好地完成推进系统的故障检测功能,具有工程实用可行性。 The method of extracting characteristic parameters of spacecraft propulsion system by using improved timing model is introduced. By using this method, combined with the measured data of an aircraft propulsion system test, the corresponding characteristic parameters are extracted and the threshold value of the fault criterion is obtained. The data return shows that the threshold is more sensitive to the “leakage” fault than the threshold provided by experts in the field. With the help of multi-parameter detection, the fault detection function of the propulsion system can be completed well and has practical engineering feasibility.