Abstract: Space net is a flexible capture technology. To analyze the process of capturing target more accurately, an analysis method based on the net mouth trajectory is proposed. Using the mass spring-damper model and Hertz contact theory, a dynamics model of net capture is established. According to the time sequence, the process of net capture is divided into three stages:deploying, wrapping and capturing. Based on the trajectory analysis of the net mouth, the evaluation index for the capture success is proposed. This paper focuses on the analysis of relevant capture parameters involved in the capture process. These capture parameters include the shooting velocity, capture distance, moment of net mouth closure, and eccentric distance. The result shows that the analysis method based on the net mouth trajectory can analyze the net capture process more comprehensively and directly. The method can provide a reference for selection of capture parameters to improve the success rate of target capture by the net.

Key words: space net, capture target, trajectory analysis, capture parameter, capture evaluation