Co-prime down-sampling interrupted synthetic aperture radar sparse imaging method

A synthetic aperture radar, sparse imaging technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve problems affecting the quality of synthetic aperture radar images, improve the quality of sparse imaging, and facilitate system implementation , the effect of suppressing the side lobe level

Active Publication Date: 2018-01-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, the coprime downsampling SAR in this method is still limited to the traditional imaging method, and the high sidelobes of strong targets in the imaging image are still difficult to suppress, which affects the quality of the SAR image.

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  • Co-prime down-sampling interrupted synthetic aperture radar sparse imaging method
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Embodiment Construction

[0048] The present invention mainly adopts the method of simulation experiment to verify, and all steps, conclusions are verified correctly on MATLABR2014b software. The specific implementation steps are as follows:

[0049] Step 1. Initialize SAR radar system parameters and imaging space:

[0050] Initialize SAR radar system parameters, including: radar carrier wavelength λ=0.03m, radar center frequency f 0 =10 10 Hz, radar transmission signal bandwidth B=5×10 8 Hz, radar transmit pulse width T r =10 -5 s, radar sampling frequency F s =6×10 8 Hz, radar beam center incident angle θ=45°, radar pulse repetition frequency PRF=1000Hz, platform motion velocity vector V r =[0,100,]0m, the number of sampling points N in the range direction of the radar system r =2048, the number of radar system azimuth sampling points N a =2048, initial position of radar system antenna P S (0)=[-100,0,6000]m;

[0051] Initialize the parameters of the SAR imaging space, including: take the ...

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Abstract

The invention discloses a co-prime down-sampling interrupted synthetic aperture radar sparse imaging method. The method includes: according to a co-prime down-sampling mode and a compressed sensing sparse reconstruction method, adopting two co-prime integers for down-sampling interrupted data acquisition of azimuth pulse count in interrupted synthetic aperture radar to realize pulse co-prime down-sampling interruption of synthetic aperture radar; subjecting synthetic aperture radar data obtained by each prime number to compressed sensing sparse imaging; after two synthetic aperture radar images are obtained, performing grating lobe fusion processing to obtain a final interrupted synthetic aperture radar image, so that co-prime down-sampling interrupted synthetic aperture radar high-accuracy imaging is realized. Compared with a traditional random interrupted mode, the method has the advantage of convenience for system implementation; compared with a traditional interpolation resamplingimaging algorithm, the method has advantages of improvement of interrupted SAR sparse imaging quality, inhibition of sidelobe level in images and the like.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to the field of synthetic aperture radar (SAR) imaging technology. Background technique [0002] As an all-weather, all-weather, and information-rich remote sensing imaging technology, synthetic aperture radar (SAR) has become an important means of earth observation. The national economy and military fields play an important role. In recent years, with the rapid development of radar hardware technology and the diversification of tasks of SAR systems, it has become an urgent need for modern SAR system design to achieve multi-mode imaging and multi-functional capabilities. Interrupted synthetic aperture radar (Interrupted SAR) is one of the hot technologies to realize multi-mode and multi-functional synthetic aperture radar system at present. It mainly adopts the working mode of transmitting pulse gap, and the pulse of part of the radar working process is used to realize the radar ang...

Claims

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Application Information

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IPC IPC(8): G01S13/90
Inventor 韦顺军张晓玲蒲羚李良师君
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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