Optical path pointing error and coaxiality analysis of APT system of space laser communication terminal

Precision beam pointing is the key indicator for APT (acquisition, and tracking) system in space laser communication. The travels inside optical vector will be affected by an assembly error of axis reflectors. In this paper, model path coaxiality induced are established; distribution given a quantitative analysis performed. results show that magnitude assembling greatly but its susceptible to reflector error. Finally, correction performed tested. experimental can improved mean value beacon signal 14 9.6 μrad, respectively, which meets requirements. This work provide guidance design contribute improvement performance.