Moon water ice detection method based on polarimetric SAR (Synthetic Aperture Radar) multiple parameters

Abstract

The invention discloses a moon water ice detection method based on polarized SAR (synthetic aperture radar) multiple parameters, which mainly comprises the following steps: selecting abnormal meteorite craters at two poles of the moon as a research area, calculating a circular polarizability ratio (CPR), and selecting an area with the CPR greater than 1; obtaining the power of each scattering component in the research region by using an m-delta decomposition method, and selecting a region in which volume scattering is dominant; calculating a roughness parameter R of the research area, and selecting a relatively flat area based on the parameter; and calculating a backscattering coefficient sigma of the research region, and selecting a region with fewer stones based on the parameter. And judging the area meeting all the conditions as the area where water and ice possibly exist at the same time. According to the method, the polarimetric SAR data of the abnormal meteorite crater is analyzed, the area where water and ice exist is selected based on various parameters, the rough lunar soil surface and interference factors such as sediments and stones are eliminated, and the water and ice detection precision is improved.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a lunar water ice detection method based on polarimetric SAR (synthetic aperture radar). Background technique [0002] Polarimetric SAR is an imaging radar that emits or receives electromagnetic waves in multiple polarization states. As a low dielectric loss medium, water ice will produce coherent backscatteropposition effect (CBOE) under certain conditions. When a radar wave propagates in a weakly absorbing medium (eg, water ice, regolith), a series of random scattering occurs due to heterogeneity (eg, buried rock, voids), those scattered along the same path but in opposite directions The waves are coherently added, resulting in a backscattered radar signal with a high Circular Polarization Ratio (CPR). Therefore, polarimetric SAR is considered to be one of the most effective tools for detecting water ice. Parts of the lunar poles form a permanently shadowed region (PSR) due to...

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