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Method for suppressing SAR image sidelobe based on wavelet space apodization

A technology of sidelobe suppression and wavelet transformation, applied in radio wave reflection/re-radiation, radio wave measurement system, utilization of re-radiation, etc., can solve the problem of poor sidelobe suppression in SAR images, without loss of resolution, The effect of suppressing side lobes

Active Publication Date: 2017-05-17
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0003] In order to overcome the disadvantage that the existing sidelobe suppression method has a poor sidelobe suppression effect on SAR images, the present invention proposes a SAR image sidelobe suppression method based on wavelet transform space apodization. Compared with the traditional space apodization method, The present invention can further effectively suppress the side lobe of the SAR image while basically not losing the resolution

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  • Method for suppressing SAR image sidelobe based on wavelet space apodization
  • Method for suppressing SAR image sidelobe based on wavelet space apodization
  • Method for suppressing SAR image sidelobe based on wavelet space apodization

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[0021] The present invention will be further described below in conjunction with drawings and embodiments.

[0022] refer to Figure 1 ~ Figure 4 , a SAR image sidelobe suppression method based on wavelet transform space apodization, including 3 steps, specifically:

[0023] Step 1, wavelet decomposition of the real and imaginary parts of the complex image

[0024] After imaging with the range-Doppler algorithm, a two-dimensional complex point target image is obtained, and the real and imaginary parts of the imaged complex image are respectively decomposed by wavelet. If the complex image itself is an integer multiple of 2, then the real part is directly performed. The wavelet decomposition of the and imaginary part, if the complex image is not an integer multiple of 2, the complex image must be up-sampled to an integer multiple of 2, and then the wavelet decomposition of the real and imaginary parts is performed.

[0025] Divide the imaged complex image into two parts, real...

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Abstract

Provided is a method for suppressing SAR image sidelobe based on wavelet space apodization. The method includes the steps of two-dimensional wavelet decomposing in real and imaginary parts for complex image imaged, space apodization suppressing for each sub-channel obtained by decomposing the two-dimensional wavelet, the data in the real and imaginary parts are acquired by wavelet reconstructing for the sub-channels data after sidelobe suppression, the space apodization sidelobe suppressing for the real and imaginary parts separately, and eventually the complex image based on the wavelet space apodization sidelobe suppression is synthesized.

Description

technical field [0001] The invention belongs to the fields of image processing, sidelobe suppression and the like, and relates to the field of synthetic aperture radar image sidelobe suppression, in particular to a SAR image sidelobe suppression method. Background technique [0002] Synthetic Aperture Radar (SAR) image interpretation includes target detection, target recognition and other processes. The correctness of interpretation is closely related to image quality. In order to improve image quality, image preprocessing is essential, which has an important impact on subsequent target detection, feature extraction and classification recognition. The high sidelobe of the strong scattering point target in the SAR image will cover up the adjacent weak target, thus affecting the subsequent target detection and recognition, so sidelobe suppression is a very important step in the process of SAR image preprocessing. SAR images usually use the Fourier transform method for imaging...

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Application Information

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IPC IPC(8): G01S7/36G01S13/90
CPCG01S7/36G01S13/9005G01S13/904
Inventor 宦若虹陶一凡陈月杨鹏鲍晟霖
Owner ZHEJIANG UNIV OF TECH
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