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ISAR (Inverse Synthetic Aperture Radar) target contour extraction method capable of carrying out extraction on the basis of CLEAN algorithm scattering centers

A technology of target contour extraction and scattering center, applied in computing, computer parts, instruments, etc., can solve problems such as accuracy limitations, and achieve the effect of facilitating ISAR target classification and identification

Active Publication Date: 2016-03-09
XIDIAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide an ISAR target contour extraction method based on CLEAN algorithm scattering center extraction, which solves the problem that most of the existing contour extraction methods are based on morphological operations and their accuracy is limited

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  • ISAR (Inverse Synthetic Aperture Radar) target contour extraction method capable of carrying out extraction on the basis of CLEAN algorithm scattering centers
  • ISAR (Inverse Synthetic Aperture Radar) target contour extraction method capable of carrying out extraction on the basis of CLEAN algorithm scattering centers
  • ISAR (Inverse Synthetic Aperture Radar) target contour extraction method capable of carrying out extraction on the basis of CLEAN algorithm scattering centers

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Embodiment Construction

[0035] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0036] This paper proposes a new method of target contour extraction based on CLEAN and rubber bands, which can obtain focused ISAR images through translation compensation. Extract the two-dimensional scattering center position of the target. Scattering center extraction methods are mentioned in many documents. This paper uses the CLEAN algorithm to obtain the target's scattering center position from the two-dimensional ISAR. Using the α-shape method, the position of the scattering center at the boundary is obtained and connected into a closed curve. Here we use a new method called rubber band proposed in this article, starting from the convex hull of the scattered points, and pulling the rubber band to get the closed contour. Finally, the actual measurement data is used to verify the feasibility and accuracy of this article.

[0037] Specifically, the prese...

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Abstract

The invention discloses an ISAR (Inverse Synthetic Aperture Radar) target contour extraction method capable of carrying out extraction on the basis of CLEAN algorithm scattering centers. The method comprises the following steps: 1: firstly, utilizing a two-dimensional CLEAN algorithm to extract the position information of the scattering centers of an ISAR target, reconstructing an ISAR image according to N extracted scattering strong points to obtain a final high-resolution image, and utilizing [Alpha]-shape to obtain the positions of the scattering centers which fall on a target edge; and connecting the scattering centers by a rubber band method provided by the invention to obtain a closed curve, and carrying out smooth processing on a result to obtain a smooth target contour line. The method has the beneficial effects that a two-dimensional CLEAN high-resolution technology is applied to ISAR image counter extraction, the rubber band method provided by the invention is used for connecting the scattering centers positioned on the target edge by the closed smooth curve to obtain the ISAR target contour so as to bring convenience for subsequent ISAR target classification identification.

Description

Technical field [0001] The invention belongs to the technical field of radar imaging, and relates to an ISAR target contour extraction method based on the CLEAN algorithm scatter center extraction. Background technique [0002] Inverse synthetic aperture radar imaging is an effective method to obtain high-resolution images of moving targets, especially in radar target detection, recognition and classification. Inverse Synthetic Aperture Radar (ISAR) imaging has important application value in target classification, recognition and detection. In actual radar imaging, the target has both translational motion and rotation. The translational motion causes the same Doppler frequency offset of the scattered point echo on the target, which is not helpful for imaging and must be compensated. Rotation is the basis for realizing imaging. It makes different Doppler components of the scattering points on the target in different azimuths, so that the Doppler change information of the azimuth ...

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Application Information

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IPC IPC(8): G06K9/46
CPCG06V10/44
Inventor 张民王欣聂丁赵佳张锐
Owner XIDIAN UNIV