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Radon-Clean based improved circular SAR 3D imaging method

A three-dimensional imaging and circumference technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problem of inaccurate scattering point information and achieve the effect of precise imaging

Active Publication Date: 2019-08-23
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004]In order to overcome the deficiencies of the existing technology and overcome the problem of inaccurate extraction of scattering point information by the existing algorithm when the distance between the scattering points is relatively close and the scattering coefficients differ greatly, The invention provides an improved far-field circular SAR three-dimensional imaging method based on Radon-Clean transformation

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[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0046] The present invention utilizes the circular SAR far-field imaging model to firstly obtain the far-field echo in the target frequency-azimuth domain, and perform Fourier inverse transform on the frequency to obtain the distance-azimuth domain signal, and the image obtained at this time is embodied as a sinusoidal curve form; then the obtained distance-azimuth domain signal is subjected to Radon transform, and the spatial position of the target is estimated by detecting different sinusoidal curves; secondly, the point spread function is constructed by using the estimated three-dimensional position, and the point target is estimated using the least square method The scattering coefficient is used to estimate a single point; in order to accurately extract the target point information, the point target information is further processed, and finally the ...

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Abstract

The invention provides a Radon-Clean based improved circular SAR 3D imaging method. The method comprises steps of acquiring echo wave data, pre-processing an echo signal, estimating a target positionthrough Radon transformation, searching an accurate point, estimating a target scattering coefficient, finishing estimating all targets by using a Clean technology, and recovering and rebuilding a target 3D image by using estimated target parameters. Based on the existing algorithm, the method searches a 3D space nearby an estimated position by using a though that an accurate position is nearby the estimated position, so as to obtain accurate estimation information finally. In the original algorithm, scattering points are close to each other, and scattering strength of the scattering points ishighly different, as a result, the estimation value is inaccurate, even imaging fails. The method solves the above problems. Simulation results find that the method realizes accurate imaging based ontarget echo wave data effectively.

Description

technical field [0001] The invention relates to the technical field of microwave imaging, in particular to a circumferential SAR three-dimensional imaging method. Background technique [0002] Circular SAR (Circular SAR, CSAR) is a special curved synthetic aperture radar mode. The radar platform rotates and moves around the center of the scene to form a circular trajectory, and the echo data of the scene is recorded in all directions to meet the needs of higher refined observation. Compared with the conventional synthetic aperture radar imaging mode, the circular SAR system has the following unique advantages: (1) It can obtain the scattering characteristics of the target in all directions, the ability to extract target scattering information is stronger, and the imaging accuracy is higher; (2) It is effective to broaden the wavenumber domain bandwidth, and the theoretical resolution reaches sub-wavelength order, which makes low-band high-resolution imaging possible, and is ...

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/418
Inventor 王保平马健钧韩昭旋张研方阳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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