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27 January 2009 Optimization of the exposure time of aerospace camera through its signal-to-noise ratio
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The aerospace camera developed is an exclusive functional load of a micro satellite. The signal-to-noise ratio of the aerospace camera reflects its radiance response and is the parameter that directly associates with the quality of its acquired images. The traditional way to calculate the signal-to-noise ratio of a camera is to substitute the related parameters of its subassemblies into the deduced formulas. This kind of method lacks the focalization on the diversities of its components and specific application occasions. The result tested by using standard uniform source can certainly be utilized to evaluate the work performance of the camera, but it ignores its actual orbital atmospheric condition and consequentially leads to unavoidable data deviation. The atmospheric transmission model is built and the radiation condition of the aerospace camera in orbit is simulated by means of MODTRAN. Instead of building the noise model based on electronic devices of the camera to get theoretical noise data, considering the difference of the noises of the camera between in-lab and on-orbit condition, we adopt the measured noise data of the CCD camera to calculate the signal-to-noise ratio so as to make it approach the real value as possible. The influences of the changes of solar altitude angle, earth surface albedo and weather condition on the signal-to-noise ratio of the camera are quantitatively determined. The result of the signal-to-noise ratio can be used as the basis to evaluate the remote sensing imaging quality and to decide the feasible exposure time.
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Yuheng Chen, Yiqun Ji, Jiankang Zhou, Xinhua Chen, and Weimin Shen "Optimization of the exposure time of aerospace camera through its signal-to-noise ratio", Proc. SPIE 7156, 2008 International Conference on Optical Instruments and Technology: Optical Systems and Optoelectronic Instruments, 715617 (27 January 2009);


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