Polarization coherence matrix scattering energy decomposition method based on polarization similarity matching

Abstract

The invention belongs to the technical field of radar automatic target recognition, and discloses a polarization coherence matrix scattering energy decomposition method based on polarization similarity matching. Deorientation angle is carried out on an observation coherence matrix T1 obtained based on a radar to obtain a polarization coherence matrix T, the maximum polarization similarity between the polarization coherence matrix T and a surface scattering mechanism, the maximum polarization similarity between the polarization coherence matrix T and a dihedral angle scattering mechanism and the maximum polarization similarity between the polarization coherence matrix T and a volume scattering mechanism are respectively calculated, a leading scattering mechanism of the polarization coherence matrix T and a main scattering coherence matrix Tmain1 corresponding to the leading scattering mechanism are determined, the priority decomposition under the positive semidefinite constraint is carried out on the main scattering Tmain1, and an energy and residue matrix Trem1 corresponding to the leading scattering mechanism is obtained; after the leading scattering mechanism is removed, the energy corresponding to other scattering mechanisms is extracted in sequence under the energy non-negative constraint based on the polarity similarity of the residue matrix Trem1; which kind of the energy corresponding to the ultimate residue matrix belongs to is determined according to the corresponding polarization similarity between the ultimate residue matrix and the different scattering mechanisms. Lastly, scattering energy corresponding to all the scattering mechanisms is obtained.

Description

technical field [0001] The invention belongs to the technical field of radar automatic target recognition, and relates to a polarization coherence matrix scattering energy decomposition method under the matching of polarization similarity, which is used to estimate the components of several different scattering mechanisms in a target, and provides important information for target classification and recognition. feature information. Background technique [0002] Polarization synthetic aperture radar SAR obtains the corresponding scattering matrix by measuring the scattered echoes in each resolution unit on the ground. The polarization scattering matrix unifies the energy characteristics, phase characteristics and polarization characteristics of the target scattering, and relatively completely describes the Electromagnetic scattering properties of radar targets. From the polarimetric SAR image data, the polarimetric scattering characteristics of the target can be extracted to...

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Problems solved by technology

[0004] In view of the deficiencies in the prior art above, the purpose of the present invention is to propose a polarization coherent matrix scattering energy decomposition method under the matching of polarization similarity, that is, based on the polarization similarity, the decomposition order of different scattering mechanisms is determined to solve the existing Overestimation of volume scattering energy or underestimation of dihedral scattering energy in the method

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