Sliding spotlight SAR three-dimensional imaging method based on compressed sensing
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A sliding beamforming, compressed sensing technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problems of low imaging accuracy and small imaging area.
Active Publication Date: 2014-09-24
哈尔滨工大雷信科技有限公司
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[0003] The present invention aims to solve the problems of small imaging area and low imaging precision in the prior art, and provides a three-dimensional imaging method for sliding spotlight SAR based on compressed sensing
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specific Embodiment approach 1
[0026] Specific Embodiment 1: The compressive sensing-based sliding beam spotting SAR three-dimensional imaging method of this embodiment is implemented in the following steps:
[0027] 1. The airborne radar establishes the sliding spotlight SAR echo model according to the original echo signal received by the scene irradiation area;
[0028] 2. Two-dimensional sliding spotlight SAR imaging of a single radar in the model;
[0029] 3. Form a three-dimensional matrix from the SAR images of a plurality of radars after step 2 imaging;
[0030] 4. Perform compressed sensing processing on the three-dimensional matrix slice, that is, complete the sliding spotlight SAR three-dimensional imaging method based on compressed sensing.
specific Embodiment approach 2
[0031] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the establishment of the sliding beam spotting SAR echo model in the step 1 is specifically:
[0032] S ( s , τ ) = A 0 · rect [ X - ( V g / V a ) s ...
specific Embodiment approach 3
[0037] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: in the step two, the two-dimensional sliding poly-SAR imaging of a single radar in the model:
[0038] (1) Perform azimuth Fourier transform according to the original echo signal to obtain the range-Doppler domain
[0039] The azimuth Fourier transform is performed on the original echo signal, and the signal domain is changed into the range Doppler domain. According to the formula (1-1), the exact expression of the original echo signal in the range Doppler domain is:
[0040] S rd ( f s , τ ) = C 1 ...
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Abstract
The invention relates to the field of three-dimensional imaging, in particular to a sliding spotlight SAR three-dimensional imaging method based on compressed sensing. The sliding spotlight SAR three-dimensional imaging method based on compressed sensing aims to solve the problems that the imaging area is small and the imaging precision is low in the prior art. The method comprises the steps that firstly, a sliding spotlight SAR echo model is established for airborne radar devices according to original echo signals received by a scene irradiation area; secondly, SAR imaging is carried out on a two-dimensional sliding spotlight of each radar device in the model; thirdly, SAR images, obtained in the second step, of the radar devices form a three-dimensional matrix; fourthly, compressed sensing is carried out on slices of the three-dimensional matrix, and then the process of sliding spotlight SAR three-dimensional imaging based on compressed sensing is completed.
Description
technical field [0001] The invention relates to a sliding spotlight SAR three-dimensional imaging method based on compressed sensing. Background technique [0002] Traditional SAR is a two-dimensional imaging of a three-dimensional scene, and its range imaging position is determined by the distance between the target and the radar. The imaging result is actually the superposition of the scattering coefficients of all scatterers with the same distance. Therefore, there are problems such as cylindrical symmetry blurring and overlapping phenomenon in 2D SAR imaging. At the same time, there are corresponding problems in the two existing classic SAR modes. Spotlight SAR has high precision, but its imaging area is small; strip SAR has a large imaging area, but its imaging accuracy is low. Contents of the invention [0003] The present invention aims to solve the problems of small imaging area and low imaging precision in the prior art, and provides a sliding spotlight SAR thre...
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