Method for reconstructing target three-dimensional scattering center of inverse synthetic aperture radar

Abstract

The invention provides a method for reconstructing target three-dimensional scattering center inverse synthetic aperture radar. The method for reconstructing the target three-dimensional scattering center of the inverse synthetic aperture radar comprises the following steps: conducting continuous image formation on echo data after motion compensation so as to obtain an ISAR two-dimensional image sequence; respectively conducting horizontal scaling and vertical scaling on the information storage and retrieval (ISAR) two-dimensional image sequence so as to obtain a position coordinate of the scattering center; and respectively extracting a position coordinate of the scattering center in an ISAR two-dimensional image of each frame, calculating a displacement velocity field of every two adjacent frames of the scattering center of the ISAR two-dimensional image, combining projection equation and target motion equation of an orthographic projection model so as to obtain estimated values of a third dimension coordinate by combining a projection equation and a target motion equation of an orthographic projection model, and averaging multiple estimated values to obtain the final third dimension coordinate. Therefore, reconstruction of the target three-dimensional scattering center is completed directly. The method for reconstructing the target three-dimensional scattering center of the inverse synthetic aperture radar does not need cost of extra system hardware, can distinguish scattering centers with different heights in the same distance and position resolution unit, does not need to utilize prior information such as observation perspective of the radar, and has relatively small calculating amount.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a method for reconstructing a three-dimensional scattering center of a target based on an inverse synthetic aperture radar. Background technique [0002] The basic functions of modern radar have been extended from target detection and localization to feature acquisition and target recognition. The scattering center model of the radar target can reflect the geometrical structure characteristics of the target, and provides a concise and clear description method for the electromagnetic scattering phenomenon of the radar target. [0003] Compared with the one-dimensional and two-dimensional scattering center models, the three-dimensional scattering center model of the target can provide more abundant and accurate target feature information; in-depth research on the high-dimensional characteristics of the scattering center is also an important way to discover new mechanisms and ...

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the deficiencies of the prior art, the present invention provides a method for reconstructing the three-dimensional scattering center of the target by using the ISAR two-dimensional image sequence to overcome the large amount of calculation in the prior art, the need for more prior information of the target, and the inability to distinguish Defects with multiple scattering centers of different heights within the same range- and azimuth-resolved cell

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