In space laser communication system, acquisition, tracking and pointing (ATP) technology is quite important. The pointing precision of the ATP system is a decisive factor in the success of the whole communication system. The artical mostly analyzes the compound axis tracking in space laser communication system. Firstly, the conception of the optical inter - satellite communications and the excellences of realizing the inter - satellite communications by laser are introduced. Then the traits of compound axis tracking are analyzed, the field of view matching of compound axis tracking and its capability analysis are given. Finally, through the simulation and comparison the conclusion that choosing appropriate bandwidth and bandwidth ratio can restrain system error is obtained.%在星间激光通信系统中,捕获、跟踪和瞄准(Acquisition Tracking and Pointing,ATP)技术是一项关键技术,ATP系统的跟踪瞄准精度对整个通信的成功与否起着至关重要的作用.主要对星间通信的复合轴跟踪进行了分析.首先介绍了星间光通信的概念和用激光实现星间通信的优点,然后分析了复合轴跟踪结构的特点,给出了复合轴跟踪控制系统的视场匹配关系和性能分析,最后采用仿真对比得出选择合适的粗、精跟踪带宽和带宽比对系统误差有突出抑制能力的结论.
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