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地球静止轨道甚高分辨率成像系统利用薄膜衍射成像可实现对地1 m分辨率。成像系统中的索杆铰接式伸展臂尺寸较长、变形精度要求高,主镜尺寸较大、厚度较薄,系统成像质量对镜面变形要求高,使得伸展臂和主镜的热控成为系统热设计的难点。在调研国内外可展开式遮光罩技术和大口径薄膜镜面热控技术的基础上,对地球静止轨道甚高分辨率成像系统的伸展臂和主镜进行了初步热分析,给出了系统热控方案。分析了可展开式圆锥形遮光罩在四种极端工况下的温度分布,确定了热控方案的可行性。
Very high resolution imaging systems for the geostationary orbit use thin film diffraction imaging to achieve resolutions of 1 m to ground. In the imaging system, the rod-extension arm has longer dimension, high deformation precision, larger primary mirror size and thinner thickness. The imaging quality of the system requires high deformation of the mirror, making the thermal control of the extension arm and primary mirror a system heat Design difficulties. Based on the investigation of expandable dome technology and large-aperture thin-film mirror thermal control technology both at home and abroad, the thermal analysis of the extended arm and the primary mirror of the very high resolution imaging system of the geostationary orbit was carried out. The thermal control Program. The temperature distribution of expandable conical sunshades in four extreme conditions was analyzed and the feasibility of the thermal control scheme was confirmed.