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

An imaging method and multi-aperture technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve problems such as azimuth multi-channel non-uniform sampling, echo signal interference, etc., to solve mutual interference and Azimuth multi-channel non-uniform sampling, improve signal-to-noise ratio, and achieve the effect of accumulation

Inactive Publication Date: 2013-01-30
INNER MONGOLIA UNIV OF TECH
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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] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

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

[0039] Such as 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, and the aperture spacing is d, and the height direction is composed of K sub-apertures, and the aperture spacing is for r. The coordinate system is established with the ground as the XY plane, X is the direction along the track, Y is the direction vertical to the track, and Z is the height direction. At time t=0, the sub-aperture coordinates of the azimuth position being 1 and the distan...

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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 space-borne synthetic aperture radar signal processing, in particular to a two-dimensional multi-aperture ScanSAR imaging method. Background technique [0002] ScanSAR is a commonly used wide swath imaging mode, which has been successfully applied in many spaceborne SAR (Synthetic Aperture Radar) systems. ScanSAR adopts the Burst working system and the periodic adjustment of range beam pointing to broaden the mapping bandwidth of traditional spaceborne SAR, but compared with the traditional strip mode, the azimuth resolution of ScanSAR mode is significantly reduced. If the geometric resolution acquired by the radar can be improved and the high-resolution wide-coverage imaging capability can be realized while ensuring the wide-area illumination surveying and mapping of hundreds of kilometers, this can greatly shorten the cycle of high-resolution earth observation, thereby further meeting the needs of the military. ...

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Application Information

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