Exposure of space camera prediction with radiative transfer software PcModWin

Ding-jie Xie; Zhi-hai Xu; Hua-jun Feng

doi:10.1117/12.867700

13 October 2010 Exposure of space camera prediction with radiative transfer software PcModWin

Ding-jie Xie, Zhi-hai Xu, Hua-jun Feng

Proceedings Volume 7654, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 76541I (2010) https://doi.org/10.1117/12.867700
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

In the course of space camera observation, the ground target and observing condition are changing all the time, so the light radiance in space camera entrance is different. In order to get appropriate exposure even though ground target is different, we need to analyze the relationship between observing condition and exposure value of space camera. The purpose of this paper is to propose a method to calculate exposure value of space camera according to type of ground target and observing condition. Atmosphere radiative transfer soft PcModWin is developed by Ontar Corporation, USA. Using PcModWin, we can calculate atmospheric transmittance, solar and atmospheric radiance when solar zenith angles, atmosphere models, atmospheric aerosols and atmospheric visibility are different according to variation of observing condition. The target radiance in space camera entrance can be calculated by multiplying ground target radiance by atmospheric transmittance. Adding atmospheric backscattering radiance and target radiance in camera entrance together, we can get total irradiation in camera entrance. Then according to camera aperture value and lens transmittance, we can calculate irradiance of image plane. Finally, by multiplying with exposure time of camera (integral time for TDI-CCD), the exposure value of space camera can be acquired. We established the relationship between ground target, observing condition and exposure of space camera. When the ground target, observing time or weather condition is different, we must set appropriate camera parameters if we want to take qualified photos. This relationship is useful for radiometric calibration in laboratory.

Citation Download Citation

Ding-jie Xie, Zhi-hai Xu, and Hua-jun Feng "Exposure of space camera prediction with radiative transfer software PcModWin", Proc. SPIE 7654, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 76541I (13 October 2010); https://doi.org/10.1117/12.867700

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