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

An imaging method, multi-aperture technology
CN102901964BInactive Publication Date: 2014-07-02INNER MONGOLIA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INNER MONGOLIA UNIV OF TECH
Publication Date
2014-07-02
Estimated Expiration
Not applicable · inactive patent

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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.
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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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