离散式光学系统光轴指向误差建模与数字化标校  

Modeling and Digital Correction of Optical Axis Pointing Error for Discrete Optical System

作　　者：赵宏达 李顺合 江涛[1] 方昉 Zhao Hongda;Li Shunhe;Jiang Tao;Fang Fang(Intelligent Optoelectronics and Digital Manufacturing Laboratory,Huazhong Institute of Electro-Optics,Wuhan 430223,Hubei,China)

机构地区：[1]华中光电技术研究所智能光电与数字制造实验室,湖北武汉430223

出　　处：《光学学报》2023年第18期305-314,共10页Acta Optica Sinica

基　　金：华中光电技术研究所自研项目(ZY573)。

摘　　要：针对离散式光学系统光轴指向误差标校需求,研究了一种基于测星法的光轴指向误差数字化标校技术。以某型离散式光学系统为例,采用四元数数学方法推导了含有光机结构加工装配误差以及传感器测量误差在内共计11个系统误差参量的地理系光轴指向模型。将指向模型中包含误差参数的三角函数项泰勒级数展开并作一阶近似处理将方程线性化。通过最小二乘原理获得了光路中系统误差解算模型。基于天文导航基本原理建立了以星体为目标的标校基准。通过实验测试完成了光轴指向误差数字化标校技术原理验证。分析表明:通过测星法光轴指向误差数字化标校能够大幅提高离散式光学系统光轴指向精度。本文研究方法和结论可以为离散式光学系统光轴指向误差标校提供参考。Objective To meet the performance indicator requirements of long focal length,far detection distance,and high agility,modern optoelectronic equipment usually adopts the discrete optical-mechanical design to integrate a series of complex optical-mechanical components and sensors such as off-axis three mirrors,scanning reflector,fast steering mirror,and inertial measuring unit(IMU).These optical-mechanical components and sensors dramatically lead to more complex optical paths,making the optical axis pointing accuracy increasingly more sensitive.On one hand,the relative positions between the optical and mechanical components are changed easily under the excitation of vibration and shock mechanical environment and thermal environment.On the other hand,there are also measurement errors in IMU sensors.Both of them will ultimately lead to the out-of-tolerance of optical axis pointing accuracy.Frequent reassembly will not only consume huge manpower and material resources but also seriously interface with the program progress.Additionally,the influence of the assembly and adjustment residuals for the discrete optical system on the pointing accuracy cannot be ignored.Compared with the traditional mechanical assembly and adjustment,the digital correction can realize the rapid calibration of optical axis pointing through the pointing error modeling and the sample data obtained by tests.Therefore,it has become more and more urgent for the discrete optical system to develop research on digital correction technology.Methods A digital correction method of optical axis pointing error based on star measurement is studied to realize the fast correction of the optical axis pointing error of discrete optical systems.A discrete optical system containing the scanning reflector,fixed reflector,and IMU sensor is taken as an example to conduct the studies.At first,the optical axis pointing model in the geodetic coordinate system is derived by the quaternion method.In the pointing model,a total of 1l error parameters caused by structural p

关 键 词：离散式光学系统 指向误差 数字化标校 测星法 四元数 

分 类 号：O439[机械工程—光学工程]