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Dingjie Xie

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Proceedings Article | 14 October 2010 Paper

Exposure of space camera prediction with radiative transfer software PcModWin

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

Proceedings Volume 7654, 76541I (2010) https://doi.org/10.1117/12.867700

KEYWORDS: Cameras, Atmospheric modeling, Atmospheric particles, Transmittance, Calibration, Radiative transfer, Image transmission, Sun, Aerosols, Visibility

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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.

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