Research on analysis and suppression method of scene inhomogeneity of spaceborne imaging spectrometer

• Main Authors: Liu, Ziying, Tang, Shaofan, Li, Huan, Zhang, Mingjie
• Format: Conference Proceeding
• Language: English
• Published: SPIE 12.03.2021
• ISBN: 9781510643611; 1510643613
• ISSN: 0277-786X
• DOI: 10.1117/12.2587115

Earth observation satellites are subject to rapid changes in ground albedo and atmospheric changes, resulting in uneven observation of the ground scene. This paper analyzes its influence on the spaceborne imaging spectrometer by parametrically simulating the non-uniformity of the space scene in the ALT and ACT directions, and introduces the design scheme of the mirror-based slit homogenizer and Offner beam splitter mount. The results show that when traditional slits and slit homogenizers are non-uniformly illuminated, the ISRF inherent distortion values of the spectral response function are 65.7% and 3.78%; the maximum curve of the Offner beam splitter is 0.257, which accounts for a single detector 0.8% of the pixel size, which improves the uneven illumination of the slit and the curved line of the spectrometer, effectively suppresses spectral distortion, improves the accuracy of hyperspectral data, and achieves the high-fidelity goal of the spaceborne imaging spectrometer.