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Chandrayaan-2 Dual Frequency Synthetic Aperture Radar (DFSAR) Full and Compact Polarimetric Data Analysis for the Lunar Surface
Journal
Proceedings - 2021 7th Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2021
Date Issued
2021-01-01
Author(s)
Bhogapurapu, Narayanarao
Bhattacharya, Avik
Rao, Y. S.
Abstract
India launched the Chandrayaan-2 satellite on 22 July 2019, with several sensors onboard to map the Lunar surface and subsurface. Among the several sensors, the Dual Frequency Synthetic Aperture Radar (DFSAR) operates in L- and S-band frequencies in full and compact polarimetric modes. This paper analyzes full- and compact polarimetric SAR data acquired by L- and S-bands to explore backscattering characteristics of lunar surface and subsurface. The data utilized in this study are collected near the south polar region of the moon. We applied a few polarimetric decomposition techniques and scattering signatures to analyze the data. First, we analyzed the model-free four-component decomposition method and the model-based Yamaguchi four-component decomposition powers over various lunar surface features for the full-pol data. Similarly, for the compact-pol data, the model-free three-component decomposition and the m - χ are employed. Second, we carried out a comparative analysis of the decomposed powers at different sensor frequencies. In this preliminary study, we observed that the recently developed model-free decomposition techniques provide meaningful insights in interpreting physical scattering mechanisms in unknown/under-explored terrains of the lunar surface.
Subjects