激光与光电子学进展, 2017, 54 (7): 070603, 网络出版: 2017-07-05   

星地链路激光通信载荷粗跟踪回路设计与验证

Design and Verification of Coarse Tracking Loop for Satellite Ground Link Laser Communication Load
作者单位
长春理工大学空间光电技术研究所, 吉林 长春 130022
摘要
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±20 μrad(3σ,σ为标准差)、静态环境下±7.5 μrad(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。
Abstract
Aiming at the laser communication of geosynchronous relay satellite to earth, a servo tracking system with multiple closed loops is designed, and a mathematical model of the tracking algorithm and a proportional-integral-differential control algorithm with actuator limit for miss distance compensation of faculae are analyzed. Additionally, the composition of the servo closed-loop control system in the satellite-ground link laser communication tracking system, the performance index and work pattern of each execution module are introduced. The operating principle of the servo closed-loop system and the optical closed-loop system is explained. According to the design of the miss distance extraction algorithm and the error compensation algorithm, the optical closed-loop tracking programs in image processing module and slave machine execution module are carried out. The weak beacon tracking experiments for the whole system are carried out under static and dynamic environments, and the tracking accuracy of ±20 μrad (3σ, σ is standard deviation) in dynamic environment and ±7.5 μrad (3σ) in static environment are obtained. The experimental results verify the feasibility and the preferable operability of the design of tracking loop, and indicate that the designed tracking system has high tracking precision.

曲正, 佟首峰, 董岩, 于笑楠, 张敏. 星地链路激光通信载荷粗跟踪回路设计与验证[J]. 激光与光电子学进展, 2017, 54(7): 070603. Qu Zheng, Tong Shoufeng, Dong Yan, Yu Xiaonan, Zhang Min. Design and Verification of Coarse Tracking Loop for Satellite Ground Link Laser Communication Load[J]. Laser & Optoelectronics Progress, 2017, 54(7): 070603.

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