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Inverse synthetic aperture radar imaging method for maneuvering targets on basis of sparse aperture

A technology of inverse synthetic aperture and sparse aperture, applied in the field of communication, can solve the problem of inaccurate phase compensation, and achieve the effect of improving accuracy and good focusing performance

Inactive Publication Date: 2014-07-02
XIDIAN UNIV
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Problems solved by technology

[0005] The present invention aims at the problem of inaccurate phase compensation of the maneuvering target compressed sensing inverse synthetic aperture ISAR imaging method in the above-mentioned prior art, and the sparse aperture inverse synthetic aperture radar only aims at the limitation of smooth moving target imaging, and proposes a sparse aperture based Inverse Synthetic Aperture Radar Imaging Method for Maneuvering Targets
I

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  • Inverse synthetic aperture radar imaging method for maneuvering targets on basis of sparse aperture

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[0030] The present invention will be further described below in conjunction with the drawings.

[0031] Reference attached figure 1 The specific implementation steps of the present invention are as follows:

[0032] Step 1. Distance compression.

[0033] According to the following formula, the echo signal received by the inverse synthetic aperture radar ISAR and the echo signal at the center point of the scene are coherently detected:

[0034] s p ( t ^ , t m ) = s r ( t ^ , t m ) · s ref * ( t ^ , t m )

[0035] Where s p (·) represents the echo signal processed by coherent detection to point p of the moving target, Express the distance fast time, t m Indicates slow time of bearing, s r (·) represents the echo signal at point p of the moving target received by the radar, r represents the received echo signal, s ref (·) indicates a reference signal with a fixed time and the same center frequency...

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Abstract

The invention discloses an inverse synthetic aperture radar imaging method for maneuvering targets on the basis of the sparse aperture. The inverse synthetic aperture radar imaging method for the maneuvering targets on the basis of the sparse aperture comprises the implementation steps that (1) original echo data, with the sparse aperture, of an inverse synthetic aperture radar are received; (2) distance compression and envelope alignment processing are carried out; (3) phase correction is accurately carried out; (4) sparse aperture echo signals are reconstructed; (5) fast Fourier transform is carried out to achieve distance-Doppler imaging. According to the inverse synthetic aperture radar imaging method for the maneuvering targets on the basis of the sparse aperture, accurate phase compensation and accurate data reconstruction can be carried out on ISAR imaging processing under the conditions of the maneuvering targets and the sparse aperture, and a more focused high-quality ISAR imaging result is obtained.

Description

Technical field [0001] The present invention belongs to the field of communication technology, and further relates to a sparse aperture-based inverse synthetic aperture radar (Inverse Synthetic Aperture Radar, ISAR) imaging method of a multifunctional radar system in the field of radar signal processing. The invention can be used for inverse synthetic aperture radar ISAR imaging processing of non-cooperative multi-maneuvering targets. Background technique [0002] Inverse synthetic aperture radar imaging is a high-resolution imaging technology. Its range resolution is improved by transmitting broadband signals, and the azimuth resolution is improved by the relative movement between the radar and the target to form a synthetic array. When the multi-functional radar system implements multiple tasks for multiple targets at the same time, including detection, tracking and imaging, because the radar beam switches back and forth between different targets, it is difficult to obtain a lo...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S7/2923G01S13/90G01S13/9064
Inventor 张磊张榆红邢孟道徐刚董祺许志伟
Owner XIDIAN UNIV
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