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Signal subspace technology based single-channel spaceborne SAR moving target detection method

A technology of moving target detection and space technology, applied in the direction of radio wave measurement systems, instruments, etc., can solve the problems that cannot be completely eliminated, will become residual clutter, and are sensitive to the influence of radiation difference factors of image data in different phases, etc. Achieve the effects of suppressing residual clutter, improving detection performance, and reducing the probability of false alarms

Active Publication Date: 2015-03-18
济钢防务技术有限公司
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Problems solved by technology

The above method has a certain ability to suppress clutter, but there are also some shortcomings: it is sensitive to the influence of radiation difference factors of different phase image data
For stationary targets with strong energy, there are certain differences in the two images, which cannot be completely eliminated by signal subspace processing, and will become residual clutter, which will cause false alarms in the detection of moving targets

Method used

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  • Signal subspace technology based single-channel spaceborne SAR moving target detection method
  • Signal subspace technology based single-channel spaceborne SAR moving target detection method
  • Signal subspace technology based single-channel spaceborne SAR moving target detection method

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with accompanying drawing, and specific implementation is as follows:

[0029] 1) Singular value decomposition is performed on the rearranged reference image matrix. Let the filter window size be (2n x +1) (2n y +1), image size is L x ·L y , F 1 ∈ C L x L y × ( 2 n x + 1 ) · ( 2 n y + 1 ) , ...

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Abstract

The invention provides a signal subspace technology based single-channel spaceborne SAR moving target detection method, which can effectively suppress residual clutters and reduce the false alarm probability. The method comprises the steps of: first, carrying out singular value decomposition on a reference image matrix; second, solving a standard orthogonal basis of a reference image clutter subspace; third, solving the projection of an image to be detected in the reference image clutter subspace, and solving the projection of an f2 (x, y) in an f1 (x, y) subspace according to the standard orthogonal basis of the reference image clutter subspace; fourth, solving an image of the image to be detected after clutter suppression; and fifth, normalizing the image after clutter suppression by using an average value of a reference image block.

Description

technical field [0001] The invention is a single-channel spaceborne SAR moving target detection method based on signal subspace technology, which belongs to the field of synthetic aperture radar (SAR) signal processing, and specifically relates to the field of synthetic aperture radar moving target detection. Background technique [0002] Spaceborne SAR has incomparable airborne advantages such as covering a large area, monitoring any hotspots of interest, and freely entering and exiting the enemy's rear. Therefore, it is of great military significance to carry out research on spaceborne SAR moving target processing technology. However, the existing SAR satellites in China are all in single-channel mode, and this mode will also be used in future SAR satellites in medium and high orbits and even geosynchronous orbits. Therefore, it is of practical significance to carry out the research on the moving target processing technology of spaceborne single-channel spaceborne SAR, an...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
Inventor 张丹丹许睿鹏胡东辉仇晓兰雷斌付琨丁赤飚
Owner 济钢防务技术有限公司
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