Rapid frequency-domain backward projection three-dimensional imaging method based on GPU

A technology of backward projection and three-dimensional imaging, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc. The effect of efficiency

Active Publication Date: 2018-05-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Although the frequency domain BP algorithm has a greater efficiency improvement compared with the time domain BP algorithm, it still takes more time in the case of a large scene, because as the scene increases, the number of grid point...

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  • Rapid frequency-domain backward projection three-dimensional imaging method based on GPU
  • Rapid frequency-domain backward projection three-dimensional imaging method based on GPU

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Embodiment Construction

[0067] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correct on MATLAB R2013a software and Microsoft Visual Studio 2010 software. The specific implementation steps are as follows:

[0068] Step 1. Initialize the LASAR system parameters:

[0069] Initialize the LASAR system parameters include: platform velocity vector V=[0,100,0]m / s; initial position vector P of each array element of the linear array antenna n (0)=[0.03125·(n-64),0,250]m, where n is the array element number of the nth linear array antenna, n=1,2,...,N, N=128; the array of the linear array antenna The total number of elements N=128; the length of the linear array antenna L=4m; the distance between adjacent antenna elements d=0.03125m; the height of the radar platform R 0 =250m; radar working center frequency f c =37.5×10 9 Hz; radar carrier frequency wavelength λ = 0.008m; signal bandwidth B of radar transmitting baseband signal ...

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Abstract

The invention discloses a rapid frequency-domain backward projection three-dimensional imaging method based on a GPU. The method is characterized by based on a parallel processing ability of the GPU,using a three-dimensional frequency-domain backward projection algorithm, using a graphic processing unit GPU and adopting a single-program multi-data instruction mode to schedule abundant hardware resources so that one thread in the graphic processing unit GPU is responsible for one frequency spectrum grid point; in each thread, calculating backward projection values of current frequency domain grid points in all array directions in parallel and accumulating; and finally, through three-dimensional inverse Fourier transform, acquiring a three-dimensional SAR image. Operation efficiency of a backward projection algorithm is greatly increased. Compared with the prior art, the method possesses high operation efficiency and a three-dimensional imaging characteristic of a linear array SAR is realized. The method is suitable for synthetic aperture radar imaging, earth remote sensing and other fields.

Description

Technical field: [0001] The technical invention belongs to the technical field of radar, and in particular relates to the technical field of synthetic aperture radar (SAR) imaging. Background technique: [0002] Due to its advantages of all-day, all-weather and large-scale scene observation, synthetic aperture radar (SAR) has become an important remote sensing technology for large-area topographic surveying and mapping. greater effect. Linear array SAR (LASAR) is an extension of the target dimension space resolution capability of traditional two-dimensional SAR imaging technology, which can obtain three-dimensional radar imaging of the observed target scene, and can more precisely describe the geometric and scattering characteristics of the target in the observed scene, compared with the traditional two-dimensional SAR imaging technology. Two-dimensional SAR has improved the target feature extraction and target recognition capabilities of radar systems, and has become a hot...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9011
Inventor 张晓玲蒲黎明师君韦顺军余鹏
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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