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SAR imaging quick backward projection method based on image spectrum compression

A technology of back projection and spectrum compression, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve problems such as difficult calculations, improve calculation efficiency, optimize imaging quality, and highlight the essence The effect of sexuality

Active Publication Date: 2015-08-12
XIDIAN UNIV
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Problems solved by technology

In this way, in practical applications, the fast hierarchical post-projection algorithm FFBPA is difficult to achieve the optimal calculation amount

Method used

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  • SAR imaging quick backward projection method based on image spectrum compression
  • SAR imaging quick backward projection method based on image spectrum compression
  • SAR imaging quick backward projection method based on image spectrum compression

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Embodiment Construction

[0030] refer to figure 1 , is a flow chart of the fast backprojection method for SAR imaging based on image spectrum compression in the present invention. The fast back-projection method for SAR imaging based on image spectrum compression comprises the following steps:

[0031] Step 1, the synthetic aperture radar receives the original echo signal of the target, demodulates, samples and compresses the original echo signal in the range direction to obtain the echo signal s(x,r) after the range pulse pressure:

[0032] s ( x , r ) = sin c B K ( r - r p ) exp - j K c ( r - r p ...

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Abstract

The invention discloses an SAR imaging quick backward projection method based on image spectrum compression, which comprises the following steps: firstly, performing direction blocking operation on full aperture of a synthetic aperture radar for dividing into N sub-apertures, wherein N is a positive integer; determining a first-stage sub-aperture imaging grid in a rectangular coordinate system, and performing coherent accumulation on an echo signal s(x,r) after a distance pulse pressure by means of a projection algorithm BPA, thereby obtaining N sub-aperture rough images of first-grade sub-apertures; in the rectangular coordinate system, performing directional frequency spectrum compression on the N sub-aperture rough images of the first-grade sub-apertures; then setting direction interval and distance interval of a next-grade sub-aperture imaging grid, performing coherent accumulation to the N sub-aperture coarse images of the first-grade sub-apertures after directional frequency spectrum compression successively in a paired manner, obtaining the sub-aperture coarse image of a next-grade sub-apertures; and finally, performing directional frequency spectrum compression and coherent accumulation for finally obtaining a full-aperture image.

Description

technical field [0001] The invention belongs to radar image processing technology, in particular to a fast back projection method for SAR imaging based on image spectrum compression, which is used for synthetic aperture radar imaging in strip mode and spotlight mode, and is suitable for airborne and spaceborne platforms. Background technique [0002] Synthetic aperture radar imaging belongs to high-resolution imaging technology. It obtains high resolution in the range direction by transmitting a large bandwidth signal, and obtains high resolution in the azimuth direction by illuminating the scene in a large viewing angle through the movement of the real aperture antenna relative to the target. . [0003] The Back Projection Algorithm (BPA) is introduced from the field of computer tomography. The back projection algorithm BPA starts from the basic working principle of Synthetic Aperture Radar (SAR), and maps the echo data after range pulse pressure to all imaging grids. Coh...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9052G01S13/9017
Inventor 邢孟道董祺孙光才杨泽民
Owner XIDIAN UNIV
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