A Sparse Imaging Method for Intermittent Synthetic Aperture Radar with Coprime Downsampling

A synthetic aperture radar and sparse imaging technology, which is applied to instruments, measurement devices, utilizing re-radiation, etc., can solve the problems affecting the image quality of synthetic aperture radar, and achieve the goal of improving the quality of sparse imaging, facilitating system implementation, and suppressing the level of side lobes. Effect

CN107576961BActive Publication Date: 2019-07-19UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-07-19

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Abstract

The invention discloses a sparse imaging method of inter-prime down-sampling intermittent synthetic aperture radar, which combines the mode of co-prime down-sampling and the sparse reconstruction method of compressed sensing. The number of pulses is down-sampled for intermittent data acquisition, and the inter-pulse down-sampling interval of the synthetic aperture radar is realized. Then, the synthetic aperture radar data obtained by each prime number is subjected to compressed sensing sparse imaging, and after two synthetic aperture radar images are obtained, rasterization is performed. The final ISAR image is obtained through lobe fusion processing, so as to realize high-precision ISAR imaging with coprime downsampling. Compared with the traditional random intermittent method, the present invention is more convenient for system realization, and compared with the traditional interpolation resampling imaging algorithm, the intermittent SAR sparse imaging quality is improved, and the side lobe level in the image is suppressed.
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Description

Technical field

[0001] The invention belongs to the field of radar technology, and particularly relates to the field of synthetic aperture radar (SAR) imaging technology. Background technique

[0002] Synthetic Aperture Radar (SAR), as an all-weather, all-weather, information-rich remote sensing imaging technology, has become an important means of earth observation. It is used in terrain image generation, target detection and reconnaissance, land resources survey and natural disaster monitoring, etc. 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 the tasks of synthetic aperture radar systems, the realization of multi-mode imaging and multi-function capabilities have become an urgent need for modern synthetic aperture radar system design. Interrupted Synthetic Aperture Radar (Interrupted SAR) is currently one of the hotspot technologies for realizing multi-mode an...

Examples

Embodiment Construction

[0048] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on MATLAB R2014b 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 emission signal bandwidth B=5×10 8 Hz, the time width of radar pulse T r =10- 5 s, radar sampling frequency F s =6×10 8 Hz, the incident angle of the radar beam center θ=45°, the radar pulse repetition frequency PRF=1000 Hz, the platform movement velocity vector V r =[0,100,0]m / s, the number of sampling points in the range of the radar system N r =2048, the number of sampling points in the azimuth direction of the radar system N a = 2048, the initial position of the radar system antenna P S (0)=[-100,0,6000]m;

[0051] Initialize the SAR imaging spa...