论文部分内容阅读
针对地球同步中继卫星对地激光通信,设计了一种包含多重闭合回路的伺服跟踪系统,分析了跟踪算法的数学模型以及用于光斑脱靶量补偿的带执行器限位比例积分微分控制算法,介绍了星地链路激光通信跟踪系统中伺服闭环控制系统的组成、各执行模块的性能指标和工作模式,给出了伺服闭环系统和光闭环系统的工作原理。根据所设计的脱靶量提取算法和误差补偿算法,分别在图像处理模块和下位机执行模块中编写了光闭环跟踪程序。对整个系统进行静、动态环境下微弱信标光的跟踪实验测试,最终获得动态环境下±20μrad(3σ,σ为标准差)、静态环境下±7.5μrad(3σ)的跟踪精度,实验结果验证了所设计跟踪回路的可行性及良好的操作性,结果表明该跟踪系统具有较高的跟踪精度。
Aiming at the geosynchronous communication of geostationary satellite to ground, a servo tracking system with multiple closed loops is designed. The mathematical model of the tracking algorithm and the proportional integral derivative control algorithm with actuator limit for miss distance compensation are analyzed. The composition of servo closed - loop control system, the performance index and working mode of each execution module are introduced. The working principle of servo closed - loop system and optical closed - loop system are given. According to the designed miss distance extraction algorithm and error compensation algorithm, the optical closed-loop tracking program is programmed in the image processing module and the lower computer execution module respectively. The whole system is tested by the tracking test of weak beacon light in static and dynamic environment. Finally, the tracking accuracy of ± 20μrad (3σ, σ is standard deviation) under dynamic environment and ± 7.5μrad (3σ) in static environment is obtained. Experimental results verify The feasibility of the designed tracking loop and the good operability are demonstrated. The results show that the tracking system has higher tracking accuracy.