基于空间光反馈的复合轴跟踪稳定特性研究  

Research on tracking stability characteristics of compound-axis based on space light feedback

作　　者：陈阳[1] 张书哲[1] 杨兴昊 于思源[1] CHEN Yang;ZHANG Shuzhe;YANG Xinghao;YU Siyuan(Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学,哈尔滨150001

出　　处：《遥测遥控》2022年第4期25-30,共6页Journal of Telemetry,Tracking and Command

基　　金：国家自然科学基金“面向空间平台的激光传输系统”(91838302)。

摘　　要：复合轴系统通过粗瞄结构和精瞄机构配合,解决了空间光通信大角度和高精度跟踪之间的矛盾,是实现高速率空间光通信的重要手段。但是粗瞄和精瞄配合工作也给复合轴系统带来了复杂的解耦问题,使整个系统的鲁棒性降低,在跟踪速率变化较快的目标时,容易出现振荡,甚至使系统处于不稳定状态。以复合轴系统为研究基础,通过伯德图对系统的跟踪带宽、精度和稳定性进行分析,得到解耦过程是影响复合轴系统稳定性的主要原因。提出了基于跟踪微分器的线性自抗扰复合轴控制解耦方案,在保证系统精度的情况下,抑制系统在解耦过程中可能出现的振荡发散现象。在卫星轨道模拟平台上进行复合轴跟踪实验,实验结果证明,在最大角加速度0.32°/s^(2)的轨道运动和最大角加速度2.26°/s^(2)的微振动情况下,改进复合轴控制有效地提高了系统跟踪的稳定性,最终跟踪精度优于1μrad(3σ)。Through the cooperation of coarse pointing assemble and fine pointing assemble,the compound-axis system solves the contradiction between large angle and high precision tracking in space optical communication and is an important means to realize high-speed space optical communication.However,the coordination of coarse pointing assemble and fine pointing assemble also brings complex decoupling problems to the compound-axis system,which reduces the robustness of the whole system.When tracking targets with fast-changing speed,it is easy to oscillate,and even make the system in an unstable state.In this paper,the tracking bandwidth,accuracy,and stability of the system are analyzed based on the compound axis system by Byrd diagram,and it is concluded that the decoupling process is the main reason that affects the stability of the compound axis system.A linear auto-disturbance rejection compound axis control decoupling scheme based on tracking differentiator is proposed to restrain the oscillation divergence that may occur in the process of decoupling while ensuring the accuracy of the system.The compound axis tracking experiment is carried out on the satellite orbit simulation platform.The experimental results show that in the case of orbit motion with a maximum angular acceleration of 0.32°/s^(2) and micro-vibration of the maximum angular acceleration of 2.26°/s^(2),the improved compound axis control can effectively improve the tracking stability of the system,and the final tracking accuracy is better than 1μrad(3σ).

关 键 词：空间光通信 PAT系统 复合轴控制 系统稳定性 

分 类 号：TN929.1[电子电信—通信与信息系统] V443.1[电子电信—信息与通信工程]