Maneuvering target ISAR imaging method

A technology of maneuvering targets, imaging methods, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measuring devices, etc.

Inactive Publication Date: 2019-04-16
ARMY ENG UNIV OF PLA
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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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[0104] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0105] For a better understanding of the present invention, below in conjunction with the attached figure 1 and one A maneuvering target ISAR imaging example is used to describe the effectiveness of the method proposed by the present invention in detail. The simulation scene of ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41
Inventor 郭宝锋孙慧贤王欣曾慧燕陶杰尹文龙胡文华史林
Owner ARMY ENG UNIV OF PLA
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