Side lobe suppression method of synthetic aperture radar image

A synthetic aperture radar and sidelobe suppression technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problem of high sidelobe in SAR images that has not been effectively solved, the nonlinear processing method has complex calculations, and the main lobe is broadened Reduce resolution and other issues to achieve the effect of convenient implementation, noise insensitivity, and suppression of side lobes

Inactive Publication Date: 2010-09-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0004] In order to obtain low sidelobe SAR images, various sidelobe suppression methods have been proposed, which can be roughly divided into two categories: one is to use linear weighting method to reduce the sidelobe level, but this needs to pay for broadening the main lobe, The cost of reducing the resolution; the second is to use some nonlinear processing methods to ensure that the image resolution is not lost
Compared with the linear weighting method, most of the existing nonlinear processing methods are more complicated and have a large amount of calculation
For now, the problem of high sidelobes in SAR images has not been effectively resolved

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  • Side lobe suppression method of synthetic aperture radar image

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[0038] The method for suppressing the sidelobe of a synthetic aperture radar image provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] figure 1 It is a flow chart of the method for suppressing the side lobe of a synthetic aperture radar image provided by the present invention. The first step of the flowchart is the SAR system spatial spectrum E(k x , k y ) is obtained by performing two-dimensional Fourier transform on the original SAR image e(x, y). The second step is the deformation of the spatial spectrum support area, including calculating the distribution function A(k x , k y ) and the deformation of the spatial spectrum support area, where k needs to be determined when calculating the distribution function of the spatial spectrum support area of ​​the SAR system x，min 、k x，max 、k y，min and k y，max For the value of , for the specific calculation formula, see page 78 of the document "Radar Imagi...

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Abstract

The invention provides a side lobe suppression method of SAR images based on the deformation of a spatial spectral support area. In the technical scheme, the relationship between SAR system space spectral support area distribution and impulse response is utilized, and the deformation of the spatial spectral support area is realized to allow the trend of an impulse response side lobe to be changed; and two SAR images with different side lobe trends are obtained by calculation, and the difference information of side lobe trends between the two SAR images are finally utilized to realize the mutual separation of a target main lobe and a side lobe and further realize the effective side lobe suppression. The side lobe suppression method is obvious and does not lose image resolution, has simple realization and low computational load, is not sensitive to noise, is also very convenient to implement, can be directly used for processing the original SAR image.

Description

technical field [0001] The present invention relates to the technical field of radar imaging, in particular to a SAR (synthetic aperture radar, synthetic aperture radar) image side lobe suppression method. Background technique [0002] The SAR system can be regarded as linear, and the impulse response of the linear system can be expressed by a sinc type function. Many important SAR image quality parameters can be estimated by impulse response, such as two quality parameters related to sidelobe performance - PSLR (peak side-lobe ratio, peak side lobe ratio) and ISLR (integrated side-lobe ratio, integral sidelobe ratio) can be measured by impulse response. The size of PSLR determines the ability of strong target points to cover adjacent weak target points, and ISLR indicates the degree to which the local dark area in the SAR image is submerged by the energy leakage of the surrounding bright areas. [0003] The side lobe performance directly affects the utilization of informa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G06T5/50
CPCG01S13/9035G01S13/90G01S7/2813G06T5/10G06T5/50G06T2207/10044G06T2207/20224G01S13/904
Inventor 王怀军粟毅朱宇涛
Owner NAT UNIV OF DEFENSE TECH
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