Since the signal light has the problems of small divergence angle and difficult acquisition under the beaconless capture mode of the free space optical(FSO)communication,a capture method of using the precision-tracking fast reflector as the capture executing agency in APT system is proposed. On the basis of the theoretical model of the capture time in the capture process,the theoretical analysis and Monte Carlo simulation for the multi-field stepping scanning and multi-field fast full scan-ning were performed. The results of simulation analysis prove that the multi-field fast full scanning selected in the beaconless ac-quisition mode has the best capture performance,and the consistency of the simulation result and theoretical analysis result was verified.%针对自由空间激光通信系统中无信标光捕获模式下,信号光的发散角小、存在捕获困难的问题,提出一种在APT系统中采用精跟踪快速反射镜作为捕获执行机构进行捕获的方法.基于捕获过程中捕获时间的理论模型,对多场步进扫描和多场快速全场扫描进行理论分析、Monte Carlo仿真,通过仿真分析可知,在无信标捕获模式下选择多场快速全场扫描捕获性能最佳,并且验证了仿真结果与理论模型的一致性.
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