上面级-返回舱分离在线辨识技术研究与实践

Research and Application of On-line Identification in Upper Stage and Reentry Capsule Separation

对多用途飞船返回舱与上面级未正常分离而造成的落区安全问题,提出上面级与返回舱分离与否的在线辨识方案。首先介绍了在线辨识基本原理,随后给出了基于姿态控制发动机连续推力激励的在线辨识算法,最后进行了数学仿真和飞行试验。在线辨识得到的角速度增量比值(K=2.895 642)与数学仿真结果(K=2.853 954)相符,说明返回舱正常分离,表明在线辨识技术自主、可靠、有效,可为搜索返回舱以及上面级进行第四次点火提供可信依据。

If the 2nd-generation reentry capsule couldn ＇t be separated from the upper stage,the landing area would move eastward and the safety of the landing would not be guaranteed. Therefore an on-line identification method for diagnosing separation was presented. As an elementary knowledge,the basic theory of the on-line identification from attitude dynamics equation was introduced.Then an on-line identification algorithm with the attitude control thruster working continuously was researched. The flight test result（ K = 2. 895 642） was consistent with the mathematical simulation result（ K = 2. 853 954）. The result indicated that the on-line identification method was reliable and efficient. Furthermore,it could provide a reliable basis for the radar searching of the capsule and the fourth burning of the upper stage＇s main engine.