基于时域集成分析的空间相机动态像移评估方法
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摘要
建立了一种包括干扰模型、结构模型、光学模型及采样成像模型的时域集成分析方法,实现了空间相机从微振动干扰输入到图像输出的端到端系统集成仿真,并开发了基于MATLAB的数据转换工具,实现了结构分析与光学分析之间的序列数据传递。以某空间相机的地面微振动实验为例进行了时域集成分析,结果表明:在两种不同的成像模式工况下,该相机的动态像移统计最大值分别达到0.42 pixel和0.27 pixel,采样成像仿真得到的图像调制传递函数下降因子分别为0.951和0.974,与原始图像无明显的直观差异,为该相机微振动影响的有效预估提供了依据。
We develop an integrated analysis process on time domain comprising models of disturbances, structures, optical systems, and sampled imaging, and realize the end-to-end system integrated simulation of the space camera from micro-vibration disturbance input to imaging output. Accordingly, a data-transforming toolkit is developed in MATLAB for transferring the structural analysis results to the optical analysis software. The integrated time-domain analysis is carried out in the ground micro-vibration tests of a space camera. The analysis results denote that: under load conditions of two different imaging modes, the maximum statistical values of the dynamic image motions of the camera are 0.42 pixel and 0.27 pixel, respectively; the descending factors of the modulation transfer function of images from the sampled-imaging simulations are 0.951 and 0.974, respectively, which have no obviously visual difference compared with that of original images. These results provide a guidance for the effective prediction of the micro-vibration influence of the space camera.
We develop an integrated analysis process on time domain comprising models of disturbances, structures, optical systems, and sampled imaging, and realize the end-to-end system integrated simulation of the space camera from micro-vibration disturbance input to imaging output. Accordingly, a data-transforming toolkit is developed in MATLAB for transferring the structural analysis results to the optical analysis software. The integrated time-domain analysis is carried out in the ground micro-vibration tests of a space camera. The analysis results denote that: under load conditions of two different imaging modes, the maximum statistical values of the dynamic image motions of the camera are 0.42 pixel and 0.27 pixel, respectively; the descending factors of the modulation transfer function of images from the sampled-imaging simulations are 0.951 and 0.974, respectively, which have no obviously visual difference compared with that of original images. These results provide a guidance for the effective prediction of the micro-vibration influence of the space camera.
引文
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[2] Sun T,Long H,Zhao D,et al.Detection and compensation of satellite flutter based on image from multispectral camera with five spectral combinations[J].Acta Optica Sinica,2014,34(7):0728005.孙韬,龙辉,赵冬,等.基于五谱段合一多光谱相机影像的卫星颤振检测和补偿[J].光学学报,2014,34(7):0728005.
[3] Miller D W,Mosier G E.Framework for multidisciplinary integrated modeling and analysis of space telescopes[J].Proceedings of SPIE,2002,4757:1-18.
[4] Zhang B W,Wang X Y,Hu Y L.Integrated analysis on effect of micro-vibration on high resolution space camera imaging[J].Spacecraft Recovery & Remote Sensing,2012,33(2):60-66.张博文,王小勇,胡永力.微振动对高分辨率空间相机成像影响的集成分析[J].航天返回与遥感,2012,33(2):60-66.
[5] Wang H J,Wang W,Wang X,et al.Space camera image degradation induced by satellite micro-vibration[J].Acta Photonica Sinica,2013,42(10):1212-1217.王红娟,王炜,王欣,等.航天器微振动对空间相机像质的影响[J].光子学报,2013,42(10):1212-1217.
[6] Zhu J Q,Sha W,Chen C Z,et al.Frequency response of imaging quality by micro-vibration for large-aperture space-borne telescope[J].Optics and Precision Engineering,2016,24(5):1118-1127.朱俊青,沙巍,陈长征,等.大口径空间相机像质的微振动频率响应计算[J].光学精密工程,2016,24(5):1118-1127.
[7] Eyerman C E.A system engineering approach to disturbance minimization for spacecraft utilizing controlled structures technology[D].Cambridge:Massachusetts Institute of Technology,1990:37-42.
[8] Hadar O,Fisher M,Kopeika N S.Image resolution limits resulting from mechanical vibrations.Part III:numerical calculation of modulation transfer function[J].Optical Engineering,1992,31(3):581-589.
[9] Ding Y W,You Z,Lu E.Influences of dimension instability of space optical remote sensor opto-structural system on imaging quality[J].Optics & Optoelectronic Technology,2004,2(3):1-4.丁延卫,尤政,卢锷.航天光学遥感器光机结构尺寸稳定性变化对成像质量的影响[J].光学与光电技术,2004,2(3):1-4.
[10] CODE V reference manual[Z].Optical Research Associates,2004.
[11] MSC.Patran user’s guide[Z].MSC Software Corporation,2008.
[12] Howard J M.Optical modeling activities for NASA’s James Webb space telescope (JWST):IV.Overview and introduction of MATLAB based toolkits used to interface with optical design software[J].Proceedings of SPIE,2007,6668:666804.
[13] Hyde T T,Ha K Q,Johnston J D,et al.Integrated modeling activities for the James Webb Space Telescope:optical jitter analysis[J].Proceedings of SPIE,2004,5487:588-599.
[14] Howard J M.Optical modeling activities for the James Webb Space Telescope (JWST) project I.The linear optical model[J].Proceedings of SPIE,2004,5178:82-88.