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
CN102901964AInactive Publication Date: 2013-01-30INNER MONGOLIA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INNER MONGOLIA UNIV OF TECH
Publication Date
2013-01-30
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 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. ...

Claims

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