天问一号探测器软着陆触火关机策略设计

Soft Landing Touchdown Strategy in Mode of Shutdown atTouchdown for Tianwen-1 Probe

针对天问一号探测器软着陆的安全性和稳定性问题,提出了一种高容错自主触火关机策略。首先考虑探测器进入、下降和着陆过程中大冲击、高动态、强振动环境,造成触火开关误触发的问题,设计了以触火信号、加速度信息以及高精度导航数据相结合的软着陆在线决策方法。通过自主故障诊断和处理策略提高了决策的正确性。然后,利用基于事件触发的发动机关机时序控制策略实现了火星着陆巡视器触火关机动作执行的自主管理及容错重构。最后试验和在轨结果表明:本文设计的高容错触火关机策略能够满足软着陆触火关机的需要。

An autonomous high fault tolerance touchdown strategy is proposed in this paper for the soft landing stability and safety.In the process of the entry,descent and landing,the touchdown monitor signals may be triggered for the Mars environment of large impact,high dynamic and strong vibration.A practical method which combines the touchdown monitor signals with the acceleration information and the accurate navigation information is proposed to guarantee the accuracy of decision.Meanwhile,an optimized touchdown shutdown timing control strategy is proposed to realize the autonomous management and fault-tolerant reconstruction of the touchdown shutdown.The test and actual flight results show that the proposed autonomous high fault tolerance touchdown strategy can satisfy the requirement of explorer for soft landing touchdown.