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A Coherent Target Decomposition Method Based on Scattering Matrix

A scattering matrix and target decomposition technology, which is applied in the field of full-polarization SAR image data processing, can solve the problems of no decomposition method, no research and analysis of the difference of similar polarization parameters of decomposition models, etc., and achieves the effect of improving accuracy and good versatility

Active Publication Date: 2011-11-30
CENT FOR EARTH OBSERVATION & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0020] The inventors found that there is still no research to analyze the connection between these decomposition models and the difference between similar polarization parameters, there is no unified decomposition method, and the application has certain limitations

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  • A Coherent Target Decomposition Method Based on Scattering Matrix
  • A Coherent Target Decomposition Method Based on Scattering Matrix
  • A Coherent Target Decomposition Method Based on Scattering Matrix

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Embodiment Construction

[0046] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the embodiment, the subscript max represents the maximum value, and the subscript min represents the minimum value.

[0047] S11: acquiring full-polarization SAR image data of the target area;

[0048] S12: extracting the scattering matrix of the full polarization SAR image data in S 12 = S 21 ; Step S11 and Step S12 are steps well known to those skilled in the art, and will not be repeated here.

[0049] S13: The scattering matrix It is decomposed into the coherent sum of the trihedral angle component scattering matrix, the dihedral angle component scattering matrix and the dihedral angle component scattering matrix rotated by 45 degrees, the formula is as follows:

[0050] S ~ = λ 1 e j φ ...

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Abstract

The invention discloses a method for decomposing coherent targets based on scattering matrixes. The method comprises the following steps of: obtaining polarimetric SAR (Synthetic Aperture Radar) image data of a target region; extracting scattering matrixes of the polarimetric SAR image data; decomposing the scattering matrixes into the coherent sum of a three-surface angle component scattering matrix, a two-surface angle component scattering matrix and a 45-degree rotation of two-surface angle component scattering matrix, wherein the formula is as follows: FORMULA, and parameters of lambda i,phi i and psi are solved by setting restricted conditions; and synthesizing an image according to a decomposing result. According to the method for decomposing the coherent targets based on the scattering matrixes disclosed by the invention, various types of coherent target decomposing methods are unified, so that the generality is better; the extracted polarization parameters can be used for reflecting scattering characteristics of targets (surface features) more accurately thereby improving the accuracy of the automatic target recognition.

Description

technical field [0001] The invention relates to the field of full polarization SAR image data processing, in particular to a coherent target decomposition method based on scattering matrix. Background technique [0002] The polarization characteristics of the target, including surface roughness, symmetry, and orientation, are mainly related to its shape and structure, so polarimetric SAR (synthetic aperture radar, namely synthetic aperture radar) image data can provide more information than single-channel SAR data. More ground object information, and the polarization characteristics of the target can promote the development of the automatic target recognition (ATR) algorithm, and the extraction method of the polarization information is the target decomposition (TD), which decomposes the complex scattering target into several smaller ones. The synthesis of basic scattering targets. [0003] Target decomposition theory (TD) can be roughly divided into two categories: coherent...

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Application Information

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IPC IPC(8): G01S7/41G01S13/90
Inventor 张红李洪忠
Owner CENT FOR EARTH OBSERVATION & DIGITAL EARTH CHINESE ACADEMY OF SCI
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