Improved RDA-based method for inhibiting synthetic aperture radar image target side lobe

A synthetic aperture radar, sidelobe suppression technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc. question

Active Publication Date: 2017-05-31
BEIHANG UNIV
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Problems solved by technology

Because the frequency domain windowing weighting method needs to smooth the spectrum, the signal bandwidth is correspondingly reduced, which reduces the image resolution of the signal; the disadvantage of the apodization filter method is that it requires a priori conditions, and the operation of calculating the filter coefficients Large amount; the spectral deformation method is that the sidelobe suppression effect is not very obvious, and it is often ineffective for adjacent targets with low intensity.

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  • Improved RDA-based method for inhibiting synthetic aperture radar image target side lobe
  • Improved RDA-based method for inhibiting synthetic aperture radar image target side lobe
  • Improved RDA-based method for inhibiting synthetic aperture radar image target side lobe

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[0176] The method for SAR image sidelobe suppression processing invented by this design is used for simulation, and its parameter settings are shown in Table 1. Three point targets are arranged along the distance direction at the center of the scene, and their amplitudes are normalized to 1, 0.05, and 1, respectively. The positions of their first two points are very close, and the third point is farther away from the first two points.

[0177] Table 1 Imaging parameter settings

[0178]

[0179] image 3 and Figure 4 It uses the traditional linear frequency modulation signal as the radar transmission signal, and then uses the range-Doppler algorithm to simulate the imaging processing results of the point target, including three-dimensional graphics and range plane diagrams.

[0180] Figure 5 and Image 6 is true image 3 The simulated point target image is subjected to range frequency domain windowing and sidelobe suppression processing results. The figure shows the...

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Abstract

The invention discloses an improved RDA-based method for inhibiting a synthetic aperture radar image target side lobe. In order to obtain a super-resolution SAR image, the method comprises the following specific processing steps of azimuth direction Fourier transformation of a two-dimensional echo signal, complementary migration correction, distance direction Fourier transformation, consistent migration correction and distance compression, distance direction inverse fast Fourier transformation, additional phase correction, azimuth direction inverse Fourier transformation and azimuth compression of a fusion inversion matrix. Compared with conventional imaging processing modes of matched filtering and the like, the processed imaging result energy is more concentrated, the space resolution ratio is significantly improved, and the super resolution target is achieved. Compared with a complete matrix-based SAR data processing, the method disclosed by the invention is combined with a high-efficiency traditional imaging algorithm, so that the processing efficiency is significantly improved.

Description

technical field [0001] The present invention relates to the technical field of synthetic aperture radar imaging processing, more particularly, refers to a method for suppressing the side lobe of a synthetic aperture radar image target based on an improved RDA. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather and all-weather active information acquisition system. The system structure is as follows: figure 1 As shown, the full-link system of synthetic aperture radar can be divided into three parts, namely, the echo data acquisition part on the radar carrier platform, the space segment data transmission part and the ground segment data processing part. The synthetic aperture radar system obtains the original echo data of the synthetic aperture radar by transmitting and receiving pulse signals. [0003] "Synthetic Aperture Radar Imaging—Algorithm and Implementation" edited by Ian G.Cumming and Frank H.Wong, published by Electronic Industry Press in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/90
Inventor 于泽余速吴有明梅名宣
Owner BEIHANG UNIV
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