双线阵测绘相机视轴抖动实时测量  

Real-time measurement for boresight vibration of dual line array surveying and mapping cameras

作　　者：翟国芳[1] 于庆盛 王蕴龙[1] 高卫军[1] ZHAI Guo-fang;YU Qing-sheng;WANG Yun-long;GAO Wei-jun(Beijing Institute of Space Mechanics and Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《中国光学（中英文）》2023年第4期878-888,共11页Chinese Optics

基　　金：国家重点研发项目(No.2016YFB0500802)。

摘　　要：本文建立了一个航天线阵测绘相机视轴测量模型,以实现对双线阵测绘相机视轴抖动的实时测量。首先,通过在相机焦平面两端设置激光收发装置,经由中央棱镜关联,构建了两台相机之间的夹角参数变化测量模型。接着,基于双矢量定姿原理推导了计算表达式,可以实现相机焦距及绕XYZ三轴变化量的高精度测量。对计算方法的误差进行了分析,并通过仿真进行了验证。此外,还对本文提出方法与工程上常用的简化方法之间的残差进行了仿真,结果表明,简化方法仅在很小的测量范围内与本文提出方法一致性良好,当测量角度范围扩大到2′时,采用本文提出的计算方法才能得到精度为0.1″的测量结果。最后,在热真空环境下进行了试验验证,结果显示采用该计算方法得到的相机内外参标定精度达0.1″,结果表明两台相机夹角参数表现出轨道周期性规律,为后续开展立体测绘任务提供了良好的参考。In order to realize the real-time measurement of the boresight vibration of the dual line array surveying and mapping camera,a measurement model of the optical axis of the aerospace line array surveying and mapping camera is established.First,by setting up laser transceivers at both ends of the focal plane of the camera,through the central prism correlation,an angle parameter change measurement model for the two cameras is constructed.An optical axis measurement method for multi-line array cameras based on the dual-vector attitude determination principle is proposed.The calculation expression is given and the algorithm error is analyzed,which is verified by simulation.In addition,the residuals of the two algorithms are simulated and the results show that the simplified algorithm is only in good agreement with the dual vector algorithm in a small measurement range but when the detection range is expanded to 2 seconds,the algorithm in this article can be used to obtain 0.1 arc-second.Finally,the algorithm was tested and verified in a thermal vacuum environment,which verified that the calibration accuracy of the internal and external parameters of the camera using this algorithm reached 0.1 arc-second.The results showed that the angle parameters of the two cameras exhibited the periodicity of the orbit,which provided good conditions for the subsequent development of stereo surveying and mapping tasks.

关 键 词：视轴测量 双矢量定姿 质心提取精度 热真空 

分 类 号：TH741[机械工程—光学工程]