Target based SNR analysis of spaceborne panchromatic TDICCD camera
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摘要: TDICCD 是近几年发展起来的一种新型光电传感器, 作为焦平面器件已广泛应用于空间相机的设计和制造. 本文分析了待观测目标太阳高度角及亮度的影响因素, 建立了光能量从待观测目标到空间相机入瞳的亮度传递数学模型, 提出了一种基于目标的全色TDICCD 空间相机信噪比快速预估计算方法. 以模拟极轨卫星所携带的TDICCD 相机为例进行了预估分析. 结果显示, 此模拟北纬20°待观测目标全年星下点太阳高度角范围为41.5°~76.7°, F 数为15 的TDICCD 相机可以获得的最大信噪比大于40dB. 本文的推导可用于TDICCD 空间相机的预研和总体设计, 同时达到验证卫星任务规划与轨道设计合理性的目的.Abstract: TDICCD is a new optoelectronic sensor developed these years, and is widely used in the design and developing of spaceborne camera. This paper analyzes the solar elevation and luminance of target, builds a mathematic model of the radiance transition from the observing target on the ground to the entrance pupil of spaceborne camera. This method can fast induce the SNR of spaceborne panchromatic TDICCD camera for any target, and validate the feassibility of satellite platform design. Taking actual camera for example, the result shows the solar elevation of some target at 20° north latitude is 41.5°~76.7°. The maximal SNR of TDICCD camera whose F number is 15 can be more than 40 dB. This paper is useful for the actual engineering.
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Key words:
- TDICCD /
- Spaceborne camera /
- SNR
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