自由空间光通信APT系统仿真

APT system simulation in free space laser communication

高精度、宽带宽的激光捕获、对准和跟踪(APT)技术是自由空间激光通信的关键技术。简要的分析了APT系统的工作原理,建立了仿真的数学模型,利用Simulink语言,实现了卫星激光通信中APT过程的动态仿真,在此基础上设计了星际激光通信复合轴APT综合模拟实验系统。由该系统得出的有效抑制带宽为200～300Hz,经过粗、精两环抑制后的振动残差为1.2μrad,通过实验获得的数据与理论分析一致。仿真结果为系统的设计以及系统的可靠性提供了保证,为进一步发展空间激光通信技术提供了理论依据。

Acquisition,pointing and tracking(APT)is the key technology in free space laser communication with the characteristics of high precision and large bandwidth.The principles of APT system are introduced,and the mathematic models are given.With Simulink language,a dynamic simulation of APT is realized in satellite laser communication.An intersatellite laser communication compound axis APT experimental system is designed,through which the effective restraining bandwidth of 200～300Hz is gotten,and the vibration remanent is 1.2μrad after the coarse and fine restraining.The data got from this experiment agree with the theories;it ensures the design and reliability of the system and supports the development of free space laser communication theoretically.