The reasonable design of the dynamic range of spaceborne remote sensor is the basic guarantee for its effective observation in-orbit, but the complex radiation characteristics of the earth-atmosphere system and other factors have brought some1 challenges to its design. Aiming at the Polarized Scanning Atmospheric Corrector (PSAC) on board Huanjing-2A/B(HJ-2A/B) satellite, the dynamic range of apparent radiance observed by PSAC is analyzed and obtained according to its detection target and band setting, based on the method of statistics of historical data of remote sensors such as Moderate-resolution Imaging Spectroradiometer (MODIS), considering the complex radiation characteristics of earth atmosphere system and scale effect. In order to meet the requirements of dynamic range design and ensure better radiation resolution, PSAC designed four gear adjustable electronic gain (relative gain is 1,2,3,4), and carried out the system radiation response gain adjustment and dynamic range test under laboratory conditions. The statistical results of on orbit observation data of PSAC show that the design results of its dynamic range meet the needs of on-orbit observation application, and lay a foundation for the retrieval of atmospheric and aerosol parameters and the realization of atmospheric correction objectives.
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