Conceptual study of 3.5-meter segmented mirror for geostationary Earth observation satellite
Conceptual study of 3.5-meter segmented mirror for geostationary Earth observation satellite
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静止对地观测卫星3.5米分段镜概念研究
DOI：
10.1117/12.2324620
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Marie Tanaka
中科院分区：
文献类型：
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作者：
T. Mizutani;T. Kamiya;M. Sakai;K. Kitamoto;S. Yasuda;T. Kimura;Marie Tanaka
对假定安装在地球静止轨道卫星上进行地球观测的光学成像仪系统进行了可行性研究。在最低点观测条件下，全色模式的目标空间分辨率小于10米，观测面积假设为100 × 100平方公里。光学系统设计基于科尔施三镜消像差；主镜直径3.5米，焦距约45米。最大波前误差在视场内小于0.017 λrms。下一步，对主镜像进行分段，并对两种分段镜像配置进行权衡研究。在PSF和MTF方面比较了每种结构的光学性能。此外，还讨论了由于分割镜的不对准和畸变导致的光学性能下降，并利用蒙特卡罗方法进行了数值估计。因此，估计了波前误差对分段镜组件的灵敏度。
A feasibility study was conducted for an optical imager system assumed to be mounted on a geostationary orbit satellite for Earth observation. The targeted spatial resolution was less than 10 meters for panchromatic mode at nadir observation conditions, and the observation area was assumed to 100 × 100 square kilometers. The optical system was designed based on a Korsch three mirror anastigmat; the primary mirror was 3.5 meters in diameter, and the focal length was approximately 45 meters. The worst wavefront error was estimated at less than 0.017 λrms in the field of view. As the next step, the primary mirror was segmented, and a trade-off study was conducted on two types of segmented mirror configurations. The optical performance of each configuration was compared in terms of PSF and MTF. Moreover, the deterioration of optical performance due to the misalignment and distortion of the segmented mirror was discussed and numerically estimated by using the Monte Carlo method. The sensitivity of the wavefront error was consequently estimated for the segmented mirror assembly.