Maneuvering target ISAR imaging method

Abstract

The invention relates to a maneuvering target ISAR imaging method, and belongs to the field of radar signal processing. The method comprises the following steps of: 1) realizing pulse compression through matched filtering according to baseband echoes received by a radar to generate a one-dimensional range profile sequence; 2) performing motion compensation on the one-dimensional range profile sequence; 3) performing cross-distance unit migration correction on the one-dimensional distance image sequence subjected to motion compensation by adopting keystone transformation; 4) according to the measurement information of the radar, obtaining a cumulative rotation angle change curve of the target in the imaging period, and performing second-order fitting to obtain an equivalent rotation angularvelocity and an angular acceleration value; 5) constructing a primary function matched with Fourier transform according to the equivalent rotation angular velocity and the angular acceleration valueof the target; and 6) performing MFT on each distance unit of the one-dimensional distance image after the cross-distance unit migration correction, and completing azimuth compression to obtain an ISAR two-dimensional image. According to the invention, by constructing an MFT primary function and performing MFT on each distance unit, the ISAR image of the maneuvering target is obtained, the steps are simple, and the imaging quality is high.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to an ISAR imaging method for a maneuvering target. Background technique [0002] According to the current research, inverse synthetic aperture radar (Inverse Synthetic Aperture Radar, ISAR) imaging technology is a branch of radar technology. Achieve Doppler high resolution. The use of ISAR technology to image the target can provide the two-dimensional structural characteristics and size information of the target, which is beneficial to the classification and identification of the target, and has a wide range of applications in the civilian and military fields. During ISAR imaging of a maneuvering target, since the equivalent rotation of the scattering points on the target during the imaging period is generally non-uniform, directly using the classic Range-Doppler (Range-Doppler, RD) algorithm for imaging will cause the Doppler unit to move and the azimu...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an ISAR imaging method for maneuvering targets, which applies Fourier transform MFT to ISAR imaging of maneuvering targets, and completes azimuth compression by constructing a basis function consistent with the target azimuth phase, eliminating It solves the image defocus problem caused by uneven target speed, and avoids the cumbersome process of estimating the equivalent rotation center

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