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Maneuvering target ISAR imaging method based on iterative phase self-focusing

A technology of maneuvering targets and imaging methods, which is applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc. Effect

Active Publication Date: 2020-05-15
NAVAL UNIV OF ENG PLA
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Problems solved by technology

[0005] Aiming at the problems of insufficient precision of the existing maneuvering target ISAR imaging phase compensation method and the limitation of the signal acquisition form, the present invention provides a maneuvering target ISAR imaging method based on iterative phase self-focusing

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Embodiment Construction

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] The present invention provides an ISAR imaging method for a maneuvering target based on iterative phase self-focusing, which solves the phase error caused by the translation of the maneuvering target and the coupling problem of the secondary phase term caused by the non-uniform rotation of the target through cyclic iteration; the design...

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Abstract

The invention discloses a maneuvering target ISAR imaging method based on iterative phase self-focusing, and the method comprises the steps: step 1, receiving an echo pulse of a maneuvering target, carrying out the pulse compression and envelope alignment, and obtaining a one-dimensional range profile sequence after the envelope alignment of the maneuvering target; step 2, estimating a phase compensation amount of the one-dimensional range profile sequence by using a minimum entropy self-focusing method; step 3, completing azimuth compression by using adaptive correction Fourier transform, andrecording a corresponding relative modulation frequency at the moment; step 4, comparing the relative frequency modulation rate in the step 3 with a preset threshold value, and if the relative frequency modulation rate is greater than the preset threshold value, returning to the step 2 for iteration; and outputting the optimal ISAR image if the ISAR image is smaller than the preset threshold. According to the method, the minimum entropy self-focusing algorithm and the adaptive correction Fourier transform are used for alternately iteratively estimating the translation phase error of the maneuvering target and the secondary phase term caused by uniform acceleration rotation, the phase error caused by translation of the maneuvering target is effectively eliminated, the compensation precision is high, and the imaging effect is good.

Description

technical field [0001] The invention relates to the technical field of maneuvering target ISAR imaging, in particular to a maneuvering target ISAR imaging method based on iterative phase self-focusing. Background technique [0002] ISAR (Inverse Synthetic Aperture Radar) imaging of maneuvering targets includes three steps: pulse compression, translation compensation and azimuth compression; among them, translation compensation includes envelope alignment and phase compensation. Many existing maneuvering target ISAR imaging methods assume that translation compensation has been successfully achieved. However, translation compensation is the focus of maneuvering target ISAR imaging, and the effect of translation compensation will directly affect the final ISAR imaging quality. Existing literature has shown that the envelope alignment method for stationary moving targets is still effective for maneuvering targets, but phase compensation requires high compensation accuracy, so it...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9029G01S13/9064
Inventor 王彬彬左雷察豪田斌刘峰汤华涛
Owner NAVAL UNIV OF ENG PLA
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