自由空间激光通信系统APT粗跟踪伺服带宽优化设计

复合轴APT控制子系统是自由空间激光通信系统中重要组成部分和关键技术,其中粗跟踪伺服单元主要完成高概率,快速捕获和高稳定、高精度跟踪.通过对影响粗跟踪精度的动态滞后误差、平台振动误差和CCD光斑检测误差进行理论分析与MATLAB仿真,并根据复合轴APT结构特性对粗跟踪伺服带宽进行优化选择,使其既能满足粗跟踪精度要求,又能使APT复合轴控制总精度达到最优,最后结合课题建立星际激光通信系统复合轴APT实验系统,实验结果与理论分析和仿真基本一致.

Optimum design of bandwidth for the APT coarse tracking assembly in free space laser communication

The compound-axis APT control subsystem is not only one of the most important parts but also is one of the key technologies on the Free Space Laser Communication (FSLC) system. In this subsystem, the Coarse Tracking Assembly (CTA) mainly aimed to accomplish the high probability, fast acquisition and high stability coarse tracking. By theoretical analyzing and MATLAB simulating for the factors that affect the coarse tracking accuracy of the system, such as dynamic lag error, flat's vibration remnant error and CCD measuring error,moreover according to the characteristic of the structure of the compound-axis APT , bandwidth of CTA was optimized to design,which satisfies the requirement of the tracking accuracy of the CTA, and optimizes the total tracking accuracy of the compound-axis APT system. At last, an APT compound-axis experiment system is established for inter-satellite laser communication, and the result is well fit to the theoretical analyzing and MATLAB simulating.