摘要
面向在轨组装的分块式空间望远镜主镜高精度合像与稳像调整问题,设计一种音圈电机驱动的六自由度子镜主动调整机构,并考虑星体柔性附件和角动量装置等微振动源影响提出一种分散式力控制方法,完成镜面位姿的高精度控制,实现分块镜合像与振动一体化控制.本文先推导了像差与子镜位姿参数之间的光学灵敏度矩阵形式,以Gram-Schmidt正交化方法得到了正六边形孔径的Zernike像差多项式;建立分块式空间望远镜整星动力学模型,基于音圈电机设计六自由度子镜主动调整机构,并提出涡流传感器阵列的位姿解算方法;提出在轨组装后的分块式空间望远镜控制方案,针对子镜的TTP(tip,tilt,piston)误差与微振动干扰,利用子镜位姿目标量与作动器期望长度的解析式,设计带有前馈补偿和速度反馈的分散式音圈电机控制器用于电机输出力和子镜位姿调整,实现合像与振动控制;仿真验证并计算成像质量评价指标,结果表明提出的控制方法可实现分块式空间望远镜高精度合像与稳像调整,调整速度快、精度高、振动衰减强.
Facing the problem of high-precision image combination and image stabilization adjustment of the primary mirror of the segmented space telescope assembled on orbit,a 6-DOF sub mirror active adjustment mechanism driven by voice coil motor is designed in this paper.Considering the influence of the micro vibration source of the star,a decentralized force control scheme is proposed,which completes high-precision control of the mirror's position and attitude.And the image combination and vibration control of the segmented mirror is realized.In this paper,the form of optical sensitivity matrix between aberration and sub mirror pose parameters is derived,and Zernike aberration polynomial of hexagonal aperture is obtained by Gram Schmidt orthogonalization method.Secondly,the whole satellite dynamics model of the segmented space telescope is established.Based on the voice coil motor,a 6-DOF sub mirror active adjustment mechanism is designed,and the position and attitude solutions scheme of the eddy current sensor array are proposed.Then,the control scheme of the segmented space telescope after on orbit assembly is proposed.Aiming at the TTP(tip,tilt,piston)error and micro vibration interference of the sub mirror,the decentralized voice coil motor controller with feed forward compensation and speed feedback is designed via the analytic expression of the position and attitude target quantity of the sub mirror and the expected length of the actuator to adjust the motor output force and the position and attitude of the sub mirror,so as to achieve image combining and vibration control.Finally,the simulation verification and calculation of the imaging quality evaluation index show that the control scheme proposed in this paper can achieve high-precision image merging and image stabilization adjustment of the segmented space telescope,with fast adjustment speed,high accuracy and strong vibration attenuation.
作者
张祥瑞
张尧
王有懿
毛岸远
ZHANG Xiangrui;ZHANG Yao;WANG Youyi;MAO Anyuan(Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Control Engineering,Beijing 100094,China)
出处
《空间控制技术与应用》
CSCD
北大核心
2023年第2期30-41,共12页
Aerospace Control and Application
基金
国家自然科学基金资助项目(11972077)。
