Electromagnetic inverse scattering imaging method based on compressed sensing

Abstract

The invention discloses an electromagnetic inverse scattering imaging method based on compressed sensing and relates to a microwave imaging technology. The electromagnetic inverse scattering imaging method comprises the following steps of: step 1, microwave excitation and measurement stage, carrying out penetrating irradiation on a target by microwave outside the target and measuring a scattering back wave of the target so as to sense internal structure and material of the target; step 2, target molding stage, establishing a nonlinear observation model between dielectric constants and the scattering back wave of the target and establishing a representation model describing sparsity of the internal structure of the target; and step 3, calculating imaging stage, imaging distribution of the dielectric constants of the target by using a target model and a compressed sensing processing method, wherein imaging results are used as representations of the internal structure of the target as different dielectric constants correspond to different constituent materials of the target. Compared with the conventional microwave imaging method, the compressed sensing processing technology is utilized by the electromagnetic inverse scattering imaging method so that the back wave observation data amount is significantly reduced and the imaging definition of the internal structure of the target is significantly improved simultaneously.

Description

technical field [0001] The invention relates to compressed sensing and a microwave imaging technology based on electromagnetic inverse scattering, in particular to obtaining electromagnetic wave echoes by irradiating a target with microwaves, and then using the echo data to invert the distribution of the dielectric constant of the target. The present invention not only utilizes the nonlinear relationship between the echo data and the distribution of the permittivity, but also utilizes the sparse characteristic of the distribution of the permittivity itself. Compared with the traditional microwave imaging method, it can improve the contour resolution definition of the internal image of the target. Background technique [0002] The quantitative electromagnetic inverse scattering method aims to reconstruct the electromagnetic parameter distribution of the target, such as permittivity, electrical conductivity, etc., and obtain the geometric image of the target while reconstructi...

AI Technical Summary

Problems solved by technology

As mentioned above, CS technology is generally only suitable for linear measurement systems. At present, there is no electromagnetic imaging method combining CS technology with nonlinear electromagnetic inverse scattering, which limits the application potential of CS technology in electromagnetic inverse scattering.

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