大气与环境光学学报, 2019, 14 (1): 49, 网络出版: 2019-04-02
星载大气痕量气体差分吸收光谱仪 基于太阳的在轨辐射定标
On-Orbit Radiometric Calibration of Spaceborne Differential Optical Absorption Spectrometer Based on the Sun
星载成像光谱仪 双向散射分布函数 在轨辐射定标 spaceborne imaging spectrometer bi-directional scattering distribution function on-orbit radiometric calibration
摘要
基于整机双向散射分布函数(Bi-directional scattering distribution function, BSDF),星载大气痕量气体差分吸收光 谱仪(Environmental trace gases monitoring instrument, EMI)在轨可完成基于太阳的辐射定标,整机BSDF表征了EMI观测 光路和定标光路辐射特性的关系。观测光路辐射定标已在地面完成,定标光路辐射特性定标在轨基于太阳完成,进而得到了 整机BSDF参数,基于此实现了EMI在轨基于太阳的辐射定标。结果表明在可比光谱范围内, 与TROPOMI(Tropospheric ozone-monitoring instrument) 载荷交叉比对结果的差异在5%～6.5%以内。
Abstract
On-orbit radiometric calibration of spaceborne differential optical absorption spectrometer can be conducted based on the bi-directional scattering distribution function (BSDF) and the sun. The EMI BSDF is the ratio of EMI radiance and irradiance calibration function. Radiometric calibration of observation path is completed on the ground. Radiometric calibration of calibration path can be realized by the sun. Then EMI BSDF is obtained, and the on-orbit radiometric calibration is conducted. The results between the EMI and TROPOMI show that the accuracy of the radiance calibration is 5%～6.5%.
汪世美, 司福祺, 赵敏杰, 周海金, 江宇. 星载大气痕量气体差分吸收光谱仪 基于太阳的在轨辐射定标[J]. 大气与环境光学学报, 2019, 14(1): 49. WANG Shimei, SI Fuqi, ZHAO Minjie, ZHOU Haijin, JIANG Yu. On-Orbit Radiometric Calibration of Spaceborne Differential Optical Absorption Spectrometer Based on the Sun[J]. Journal of Atmospheric and Environmental Optics, 2019, 14(1): 49.
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