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Synthetic aperture radar image sidelobe suppression processing method

A synthetic aperture radar, side lobe suppression technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problems of resolution reduction, loss of resolution index, reduction, etc. level, reduced crosstalk, and improved image clarity

Active Publication Date: 2021-02-02
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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Problems solved by technology

However, the obvious defect of this method is that while reducing the sidelobe interference, it loses the key resolution index of the system. If the sidelobe level is suppressed to about -20dB, the system resolution will be reduced by about 20%.
As a result, the phenomenon of cross interference is reduced, but at the same time, the ability to identify targets is reduced, which affects the final application of SAR images
[0005] It can be seen that the existing radar image processing technology still needs to be improved urgently. The process of suppressing the side lobe level leads to the reduction of resolution, which will cause bad images to the final SAR image application. Therefore, a reasonable technology must be proposed The scheme improves the current radar image processing technology to improve the final application effect of SAR images

Method used

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Embodiment

[0036] This embodiment aims at reducing the sidelobe interference while losing the key resolution index of the system in the prior art, and cannot guarantee the resolution while reducing the cross interference, and proposes a new image sidelobe processing method .

[0037] Specifically, such as figure 1 As shown, a synthetic aperture radar image sidelobe suppression processing method disclosed in this embodiment includes:

[0038] S01: Acquire the first image data of the SAR single-view complex frequency domain;

[0039] S02: Perform distance Hanning weighting processing on the first image data, and convert the distance direction of the weighted image data into the time domain to obtain the second image data, and then additionally convert the distance direction of the first image data into the time domain to obtain the third Image data, the second image data is compared with the third data to obtain the fourth image data;

[0040] S03: Perform azimuth Hanning weighting proc...

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Abstract

The invention relates to the technical field of radar image processing, and concretely relates to a synthetic aperture radar image sidelobe suppression processing method. The method comprises the steps of obtaining first image data of a synthetic aperture radar single-view complex frequency domain; processing the first image data to obtain second image data and third image data, and comparing thesecond image data with the third image data to obtain fourth image data; and processing the fourth image data to obtain fifth image data and sixth image data, and comparing the fifth image data with the sixth image data to obtain final image data. The sidelobe level can be well suppressed on the premise of not losing the system resolution, the cross interference on the synthetic aperture radar image is reduced, and the image definition is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of radar image processing, in particular to a sidelobe suppression processing method of a synthetic aperture radar image. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar that can obtain high-resolution radar images similar to optical photography in weather conditions with extremely low visibility. The radar that uses the relative motion of the radar and the target to synthesize a larger equivalent antenna aperture from a smaller real antenna aperture by data processing is also called synthetic aperture radar. Synthetic aperture radar is characterized by high resolution, can work around the clock, and can effectively identify camouflage and penetrate cover. The resulting high azimuth resolution is comparable to that provided by a large aperture antenna. Synthetic aperture radar was first used in the late 1950s on the RB-47A and RB-57D strategic reconnaissance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/02G01S7/41
CPCG01S13/90G01S13/9021G01S13/9094G01S7/023G01S7/418
Inventor 丁庆邹宗庆马益段晓威杜翔
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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