Target contour inversion method based on near field surrounding surface to scan polarization scattering data

Abstract

The invention relates to a target contour inversion method based on a near field surrounding surface to scan polarization scattering data. The method comprises the following steps that S1, according to the length direction of a target, the near field scanning elliptical column-shaped surrounding surface of the target is built; S2, two orthogonal dipoles are adopted as a transmitting antenna and areceiving antenna for near field scanning, and distribution data of near field scattering functions on the elliptical column-shaped surrounding surface of the target is acquired; S3, Huynen parameters of the distribution data of the near field scattering functions of the target are calculated; and S4, the target contour contour features are inverted on the basis of the Huynen parameters. According to the method, diagnosis and positioning of a target strong scattering source or a scattering center under different polarization states can be realized, so that a theoretical data reference is provided for design of the low-detectable geometric contour of a radar target, and an important reference base can be provided for radar target detection and recognition by utilizing polarization parameter changes caused by the target geometric contour.

Description

technical field [0001] The invention relates to a method for radar target polarization scattering modeling and feature extraction, in particular to a target shape inversion method based on near-field scanning polarization scattering data, and belongs to the technical field of radar target characteristic analysis and target recognition. Background technique [0002] The polarization scattering characteristics of the radar target not only reflect the scale information change of the target radar cross section (RCS, Radar Cross Section) under different polarization states, but also can invert the geometry of the target through the amplitude and phase differences between different polarization channels. shape information. [0003] The polarization scattering data of the target can be obtained by the inverse synthetic aperture radar (ISAR, InverseSynthetic Aperture Radar) imaging of the turntable target. The range resolution is realized by the radar incident wave bandwidth, and th...

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Problems solved by technology

In order to meet the imaging requirements of complex electrically large-scale targets, on the one hand, the incident wave frequency, angle, and cylinder longitudinal sampling interval must be very small to ensure that the imaging area completely covers the target area; on the other hand, the incident wave bandwidth must be relatively large, and the scanning cylinder must be long enough. Higher imaging resolution is guaranteed, but whether it is through electromagnetic scattering simulation or darkroom measurement experiment, the three-dimensional imaging of target cylindrical scanning has a very large workload

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