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Method for improving resolution of linear-array three-dimensional imaging synthetic aperture radars

A synthetic aperture radar, three-dimensional imaging technology, used in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation, etc.

Active Publication Date: 2010-03-10
四川电子科技大学教育发展基金会
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Problems solved by technology

[0003] In order to overcome the problem that the tangent track resolution of images obtained by the existing linear array 3D imaging synthetic aperture radar is generally smaller than the resolution along the track direction, the present invention provides a method for improving the resolution of the linear array 3D imaging synthetic aperture radar. The method of the present invention can obtain the high-resolution linear array three-dimensional imaging synthetic aperture radar image after the fusion of the orthogonal track three-dimensional imaging synthetic aperture radar

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  • Method for improving resolution of linear-array three-dimensional imaging synthetic aperture radars

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[0074] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on MATLAB7.0. The specific implementation steps are as follows:

[0075] Step 1. Perform discrete wavelet decomposition on the high-resolution dimension of the low-resolution image:

[0076] Using the Meyer wavelet base, the x-direction low-resolution linear array three-dimensional imaging synthetic aperture radar image G x Perform one-dimensional discrete wavelet decomposition in the y direction to obtain the low-frequency coefficient matrix and the horizontal direction high-frequency coefficient pair For y-direction low-resolution linear array three-dimensional imaging synthetic aperture radar image G y Perform one-dimensional discrete wavelet decomposition in the x direction to obtain the low-frequency coefficient matrix and vertical high-frequency coefficient pairs

[0077] Step 2, wavelet reconstruction to obtain the fuse...

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Abstract

The invention provides a method for improving the resolution of linear-array three-dimensional imaging synthetic aperture radars. The method adopts two linear-array three-dimensional imaging syntheticaperture radars with orthogonal motion tracks for imaging of the same region, and then blends two acquired images by discrete wavelet transform technology so as to obtain a linear-array three-dimensional imaging synthetic aperture radar image with high resolution. The invention has the following advantages of realizing high-resolution imaging of the linear-array three-dimensional imaging synthetic aperture radars by using a relatively short array antenna and solving the problem of relatively low tangential track resolution of images acquired by the linear-array three-dimensional imaging synthetic aperture radars. The method can be widely applied in the fields such as synthetic aperture radar imaging, earth remote sensing and geological mapping.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to the technical field of linear array three-dimensional imaging synthetic aperture radar (LASAR) imaging. Background technique [0002] Linear array three-dimensional imaging synthetic aperture radar (LASAR) is a new type of synthetic aperture radar system that fixes the linear array antenna on a moving platform to synthesize a two-dimensional planar array and perform three-dimensional imaging. Linear array three-dimensional imaging synthetic aperture radar can realize the ability of imaging three-dimensional ground which cannot be realized by single-antenna synthetic aperture radar at present, and has become a research hotspot in the field of synthetic aperture radar. According to the inventor's understanding and published literature, for example: J.Klare, A.Brenner, J.Ender, "A New Airborne Radar for 3D Imaging-Image Formation using the ARTINO Principle-", EUSAR, Dresden, Germany, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 张晓玲齐文元师君
Owner 四川电子科技大学教育发展基金会
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