Formulation of Radiometric Calibration for Azimuthal Multi-Angle Observation Space-Borne SAR

Jianjun Huang, Jie Chen, Yanan Guo and Pengbo Wang
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Jianjun Huang: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China
Jie Chen: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China
Yanan Guo: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China
Pengbo Wang: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China

Sustainability, 2022, vol. 14, issue 11, 1-19

Abstract: A novel space-borne SAR technique, azimuthal multi-angle observation (AMAO), has recently been proposed. It has highly flexible working modes and powerful capability of target information acquisition, but has challenges in achieving radiometric measurement accuracy. The larger the squint angle, the higher the resolution and the more variations involved. Radiometric calibration is a necessary approach to consistent and accurate SAR measurements, but has so far not been carefully considered for AMAO space-borne SAR. This paper addressed the new issues in radiometric calibration arising from the AMAO space-borne SAR system. The AMAO imaging modes are firstly been illustrated, based on which the influences of the AMAO on radiometric calibration are analyzed. To guarantee the accuracy of the radiometric calibration, an appropriate form of the SAR radar equation is derived for AMAO space-borne SAR. On these bases, the calibration models can be obtained by reformulating the novel AMAO SAR equation, and the corresponding normalization method is then proposed. The good experimental performance indicators verify the correctness of proposed models and the effectiveness of the correction method.

Keywords: synthetic aperture radar (SAR); azimuthal multi-angle observation (AMAO); radiometric calibration; radar equation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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