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Two-dimensional multi-aperture scan synthetic aperture radar (SAR) imaging method

An imaging method, multi-aperture technology

Inactive Publication Date: 2014-07-02
INNER MONGOLIA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a two-dimensional multi-aperture ScanSAR imaging method to solve the problems of mutual interference of echo signals from different sub-swaths and azimuth multi-channel non-uniform sampling in the two-dimensional multi-aperture ScanSAR mode

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  • Two-dimensional multi-aperture scan synthetic aperture radar (SAR) imaging method

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Embodiment Construction

[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] figure 1 is a schematic diagram of the working principle of the two-dimensional multi-aperture ScanSAR mode, figure 2 A schematic diagram of the aliasing of the range echo data in the 2D multi-aperture ScanSAR mode.

[0039] like figure 1 and figure 2 As shown, assuming that the flight speed of the platform is v and the height is h, the antenna array is divided into N×K sub-apertures, that is, the length direction is composed of N sub-apertures, the aperture spacing is d, and the height direction is composed of K sub-apertures, and the aperture spacing is is r. A coordinate system is established with the ground as the XY plane, X is the direction along the track, Y is the vertical track direction, and Z is the height direction. At time t=0, the coordinates of the sub-aperture whose azimuth position is 1 and the range position i...

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Abstract

The invention discloses a two-dimensional multi-aperture scan synthetic aperture radar (SAR) imaging method. The method includes the following steps of S101, subjecting echo data received by sub-apertures to range direction pulse compression respectively by using a range direction matched filter; S102, uniting the echo data which are subjected to pulse compression in a range direction and an azimuth direction to form a matrix Z and subjecting rows of the matrix Z to weighting summation by using a two-dimensional weighting vector wk respectively; and S103, subjecting the echo data to focusing imaging by using an extended chirp scaling (ECS) algorithm. By means of range direction and azimuth direction united two-dimensional digital beam forming (DBF) processing, echo separation of various sub-swaths and frequency spectrum reconfiguration of azimuth periodicity non-uniform sampling signals are achieved, and problems of mutual interference and azimuth multi-channel non-uniform sampling of echo signals of various sub-swaths under a two-dimensional multi-aperture scan SAR mode are solved.

Description

technical field [0001] The invention belongs to the field of spaceborne synthetic aperture radar signal processing, and particularly relates to a two-dimensional multi-aperture ScanSAR imaging method. Background technique [0002] ScanSAR is a commonly used wide swath imaging modality that has been successfully applied in multiple spaceborne SAR (Synthetic Aperture Radar) systems. ScanSAR adopts the Burst working system and the periodic adjustment of the range direction beam pointing to broaden the surveying and mapping bandwidth of the traditional spaceborne SAR, but compared with the traditional strip mode, the azimuth resolution of the ScanSAR mode is significantly reduced. If the geometric resolution acquired by the radar can be improved while ensuring a wide coverage of several hundred kilometers, and the imaging capability of high-resolution wide coverage can be achieved, the period of high-resolution earth observation can be greatly shortened, thereby further satisfyi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 黄平平
Owner INNER MONGOLIA UNIV OF TECH
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