SA-ISAR imaging method for target with micro-motion component based on low-rank and sparse joint constraint

A technology of SA-ISAR, imaging method, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc.

Active Publication Date: 2020-09-01
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] The idea of ​​the present invention is to solve the problem of ISAR image defocusing of targets with micro-moving parts under the condition

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  • SA-ISAR imaging method for target with micro-motion component based on low-rank and sparse joint constraint
  • SA-ISAR imaging method for target with micro-motion component based on low-rank and sparse joint constraint
  • SA-ISAR imaging method for target with micro-motion component based on low-rank and sparse joint constraint

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Embodiment Construction

[0073] The present invention will be further described below in conjunction with accompanying drawing:

[0074] figure 1 It is the general processing flow of the present invention. According to the present invention, a low-rank and sparse joint constraint-based SA-ISAR imaging method for a target with fretting components comprises the following steps:

[0075] S1 models the one-dimensional range image sequence of the target after the translation compensation of the target with fretting parts;

[0076] S2 Modeling the sparse-aperture ISAR imaging problem of targets with fretting parts;

[0077] S3 uses linear ADMM to solve the sparse aperture ISAR imaging problem of targets with micro-moving parts.

[0078] figure 2 It is the target of radar measurement: An-26, the aircraft is a twin-propeller aircraft. During the flight, its propeller rotates around the bracket at high speed, which is a micro-movement component, and other parts are the main part of the aircraft. The rada...

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Abstract

The invention belongs to the field of radar imaging, and relates to an SA-ISAR imaging method for a target with a micro-motion component based on low-rank and sparse joint constraint. The method comprises the following steps: S1, carrying out modeling of a target one-dimensional range profile sequence after translation compensation of target with a micro-motion component; S2, carrying out modelingon a sparse aperture ISAR imaging problem of the target with a micro-motion component; and S3, solving the sparse aperture ISAR imaging problem of the target with the micro-motion component by adopting linear ADMM. The method has the following beneficial effects: sparse aperture ISAR imaging of a target with a micro-motion component can be realized; under sparse aperture conditions, the one-dimensional distance image sequence of the target main body part and the micro-motion part can be effectively separated; an m-D effect caused by the target micro-motion component is eliminated; sidelobe and grating lobe interference caused by the sparse aperture is eliminated, and thus the target main body part ISAR image with a good focusing effect is further obtained; and the method has an importantengineering application value for radar imaging of a target with a micro-motion component, micro-motion parameter estimation, feature extraction and target recognition under the condition of data limitation.

Description

technical field [0001] The invention belongs to the field of radar imaging, and in particular relates to a sparse aperture inverse synthetic aperture radar (Sparse aperture inverse synthetic aperture radar, SA-ISAR) imaging method for targets with micro-moving parts based on low-rank and sparse joint constraints. Background technique [0002] Inverse synthetic aperture radar (ISAR) imaging technology can obtain high-resolution radar images of moving targets. Compared with optical imaging methods, it has the advantages of all-weather and all-weather. It has been widely used in space target surveillance, missile defense, shore-based warning, radar astronomy and other military and civilian fields. [0003] A target with micro-moving components refers to components that include other micro-movements in addition to the rigid body motion of the target body, such as helicopter rotor rotation, aircraft propeller rotation, ship antenna rotation, wheel rotation, etc. When performing ...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9064
Inventor 张双辉刘永祥黎湘霍凯姜卫东田彪张新禹高勋章
Owner NAT UNIV OF DEFENSE TECH
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