基于TD的机载激光通信跟踪控制系统设计

Design of Airborne Laser Communication Tracking Control System Based on TD

摘要:

机载激光通信系统限于机载平台的高机动性和运动的随机性，同时受到探测器检测误差、平台振动抑制残差和系统安装误差等影响，如何在大气环境中提高跟踪精度来提高通信质量是需要重点解决的问题之一；为了提高机载平台对发射端信号光的跟踪精度，设计一种基于TD的机载激光通信跟踪控制系统；由主控模块、伺服系统、光学系统和图像处理单元组成跟踪控制系统；利用跟踪微分器加上传统PID控制器，将系统中的低频大幅扰动和大动态范围的跟踪补偿量进行过渡，经过PID控制器补偿控制时，在保证快速响应的前提下同时减小了超调，从而提高控制系统的跟踪精度；通过实验分析表明，设计的系统无干扰时拥有较好的鲁棒性，在有扰动的环境中能够将跟踪精度保持在5 mrad以内，可以保证机载激光通信系统进行稳定通信。

Abstract:

The airborne laser communication system is limited by the high mobility and random motion of the airborne platform, as well as by factors such as detector measurement errors, platform vibration suppression residuals, and system installation errors. One of the key challenges is how to improve tracking accuracy in the atmospheric environment to enhance communication quality. To improve the tracking accuracy of the airborne platform for the transmitted signal light, a TD-based airborne laser communication tracking control system is designed. The tracking control system consists of a main control module, a servo system, an optical system, and an image processing unit. By utilizing a tracking differentiator combined with a traditional PID controller, the system transitions between low-frequency large disturbances and large dynamic range tracking compensation. After compensation by the PID controller, the system achieves a rapid response while reducing overshoot, thereby improving the tracking accuracy of the control system. Experimental analysis shows that the designed system has good robustness in the absence of interference and can maintain the tracking accuracy within 5 mrad in the presence of disturbances, ensuring stable communication for the airborne laser communication system.