星载光电成像系统建模与性能评估

星载光电成像系统可实现对空间目标的有效探测，而探测距离是评价系统性能的重要指标。以太阳辐射特性和深空背景特性为基础，分别建立了几何成像因素、探测器灵敏度、信噪比和成像分辨率影响下的系统作用距离的数学物理模型，推导了系统作用距离的表达式，对作用距离与曝光时间、探测器像元尺寸、有效通光口径等影响因素之间的关系进行了数值模拟研究。研究结果表明，对于有效尺寸为2 m×4 m、平均反射率为0.3 的平面目标，当光学系统口径为100 mm、焦距为500 mm、探测器像元尺寸为3.5 μm 时，系统对目标的最大作用距离为12 km，作用距离主要受成像分辨率的限制。研究结果可为星载光电成像系统的设计以及系统性能评估提供一定的基础。

Abstract

Satellite-borne photoelectric imaging system can detect space objects effectively and detection distance is an important parameter to evaluate system performance. System detection distance model influenced by the number of imaging pixel is established, detector sensitivity, signal-to-noise ratio and imaging resolution respectively and derive detection distance equation based on sun radiation and deep space radiation character. And then relations between detection distance and exposure time, pixel size and optics effective aperture are simulated. The results show that the maximum detection distance is 12 km which is limited mainly by imaging resolution when object size is 2 m × 4 m , average reflectivity is 0.3, optics effective aperture is 100 mm, detector pixel size is 3.5 μm and focal length is 500 mm. The result can provide theory guidance for the design and system performance evaluation of the satellite-borne photoelectric imaging system.

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张颖, 牛燕雄, 吕建明, 杨露, 牛海莎, 耿天琪, 许冰, 李继扬. 星载光电成像系统建模与性能评估[J]. 激光与光电子学进展, 2015, 52(2): 021101. Zhang Ying, Niu Yanxiong, Lü Jianming, Yang Lu, Niu Haisha, Geng Tianqi, Xu Bing, Li Jiyang. Modeling and Performance Evaluation on Satellite-borne Photoelectric Imaging System[J]. Laser & Optoelectronics Progress, 2015, 52(2): 021101.

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