在自由空间光通信中,精跟踪系统中快速偏转镜的跟踪性能决定了整个APT系统的跟踪精度和带宽,是通信成败的关键因素。提出了基于自适应模糊神经网络控制算法,可以实现系统参数在线实时动态调整,通过计算机仿真,模糊神经网络控制算法具有良好的鲁棒性。最后, 通过外场1.3 km信标光传输实验,快速偏转镜的跟踪精度达到了2.5 μrad。

Tracking performance of fast steering mirror (FSM) determines the success in the free space optical communication.Adaptive control algorithm based on fuzzy neural network is proposed, by which the on-line dynamic adjustment of systematic parameters can be realized. The algorithm has good robustness through computer simulation. Tracking accuracy of FSM reaches 2.5 μrad in a terrestrial free-space 1.3 km beacon transmission.