关键词: 空间安全, 轨道机动, 可达域, 碰撞威胁规避, 非合作航天器

Abstract:

In the face of the increasingly complex space security situation， this paper proposes an approach based on spacecraft reachable domain for spacecraft maneuvering approach threat calculation， assessment， and avoidance. Firstly， a general method to solve the reachable domain for spacecraft with single limited-magnitude impulse based on the reachable criterion is presented. Secondly， the region in the threat domain of on-orbit spacecraft is calculated by judging the position relationship between its orbit and the reachable domain of incoming maneuvering spacecraft which is the danger area. Thirdly， a threat evaluation index is defined by means of the time two spacecraft enter and exit the danger area. The threat of on-orbit spacecraft is measured from two aspects： position matching and time window matching. Based on minimizing the danger area， an active avoidance strategy of spacecraft with optimum multi-impulses maneuver is given to avoid the danger area. The simulations show that the on-orbit spacecraft can avoid the danger area while satisfying the given constraint conditions， and return to the proper orbit with minimum fuel consumption.

Key words: space security, orbital maneuver, reachable domain, collision threat avoidance, noncooperative spacecraft