ATP跟瞄精度与最佳信号光发射角的研究

激光星间通信中捕获、跟踪、瞄准(ATP)技术是保障通信正常进行的关键一环，在完成捕获进入跟踪状态下，ATP的跟瞄精度是一个重要指标。然而．在实际系统中，ATP的跟瞄精度受到很多因素的制约．只能达到一定的精度。在这种条件下．信号光束发散角的选取对通信系统的整体性能影响很大。提出了影响光束发散角的三种因素，并进一步分析了在给定跟瞄精度的条件下．信号光束的发散角并不是越小越好而是存在一个最佳发散角．该发散角可以在满足通信系统指标的情况下．对发射端的功率需求最小。

Study of ATP Accuracy and the Optimum Optical Signal Transmitting Angle

Acquisition, tracking, pointing (ATP) system is one of the key components for intersatellite laser communication. After acquiring, the accuracy of pointing and tracking is an important performance index of ATP system. Because many factors restrict, in fact, the ATP system can only attain limited precision. The optical signal beam divergence angle seriously affects the performance of intersatellite laser communication, so the choice of it for the entire system is very important. Three influencing factor of beam divergence angle are put forward and an optimum beam divergence angle based on the analysis of ATP accuracy is given out. The optimum divergence angle consumes the minimum transmitting power to satisfy indexes of communication system.