中文摘要：

针对空间交会对接中的主动防撞问题，分析了航天器椭球型安全区域的碰撞问题。同时，在某一方向发动机失效的情况下，利用控制力耦合效应，设计了航天器主动防撞机动的控制律。结合安全区域分析和轨道机动的燃料消耗选择一条燃料最优的安全转移轨道。最后通过仿真，验证了发动机失效情况下的主动防撞机动控制律的有效性。

英文摘要：

The active collision avoidance maneuver（CAM） in the space rendezvous and docking is studied. A method for analyzing the collision probability in ellipsoidal safety zone is developed. Meanwhile a new control law of CAM is designed using coupling effect under the thruster failure. Finally a transfer trajectory of orbit maneuver with safe and optimal fuel consumption is able to be selected combining the analysis of safety zone and fuel consumption. The simulation results validate that the CAM control law is effective under the thruster failure.