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Rapid sparse aperture ISAR self-focusing and imaging method based on ADMM

A technology of sparse aperture and imaging method, applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve problems such as low computing efficiency

Active Publication Date: 2019-09-24
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The idea of ​​the present invention is to solve the problem of low computational efficiency of the sparse aperture ISAR imaging method, and proposes a fast sparse aperture ISAR self-focusing and imaging method based on ADMM

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  • Rapid sparse aperture ISAR self-focusing and imaging method based on ADMM

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Embodiment Construction

[0075] The present invention will be further described below in conjunction with accompanying drawing:

[0076] figure 1 It is the general processing flow of the present invention.

[0077] A kind of fast sparse aperture ISAR imaging method based on ADMM of the present invention, comprises the following steps:

[0078] S1 models sparse aperture radar echoes;

[0079] S2 reconstructs the target ISAR image X through ADMM;

[0080] S3 estimates the initial phase error φ through the minimum entropy criterion.

[0081] Firstly, the simulation data is used for experiments. During the experiment, according to figure 2 (a) shows a certain plane plan, build figure 2 (b) Scatter point model shown. Assume that after the radar echo is compensated for translation, the target rotates at a constant speed of 0.06rad / s along the rotation center; the radar parameters are set as follows: set the center frequency to 9GHz, the bandwidth to 800MHz, the pulse to 100μs, and the pulse repetit...

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Abstract

The invention belongs to the radar signal processing field and especially relates to a rapid sparse aperture ISAR self-focusing and imaging method based on ADMM. The method comprises the following steps of S1, modeling a sparse aperture radar echo; S2, reconstructing a target ISAR image X through the ADMM; and S3, estimating an initial phase error phi through a minimum entropy criterion. The method has advantages that the initial phase error can be effectively estimated from the sparse aperture radar echo so as to realize ISAR self-focusing, and sidelobe and grating lobe influences introduced by undersampling can be effectively eliminated so as to obtain a high resolution ISAR image; robustness is high, and ISAR self-focusing and imaging can still be realized under a low signal to noise ratio condition; operation efficiency is high, the method can be applied to a real-time ISAR imaging system, and the method has an important engineering application value.

Description

technical field [0001] The invention belongs to the field of radar signal processing, in particular to a fast sparse aperture ISAR self-focusing and imaging method based on Alternating Direction Method of Multipliers (ADMM). Background technique [0002] Inverse synthetic aperture radar (ISAR) can obtain high-resolution two-dimensional images of moving targets. Compared with optical devices, ISAR has the advantages of all-day, all-weather, and strong penetration, and has become an important detection device for space target recognition. It has been widely used in space target surveillance, missile defense, radar astronomy and other fields. At present, for the complete radar echo signal (or full aperture signal), the traditional ISAR imaging method can already obtain high-resolution images of moving targets, but for the sparse aperture signal, the traditional method basically fails, and there is still a lack of effective imaging means. [0003] In the ISAR system, many facto...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 张双辉黎湘刘永祥霍凯姜卫东田彪张新禹
Owner NAT UNIV OF DEFENSE TECH
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