Correction method for ISAR (Inverse Synthetic Aperture Radar) transverse scaling and Doppler-through movement based on revised Newton iteration

A Newton iteration and walk correction technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problem of defocusing of ISAR images

Inactive Publication Date: 2018-05-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

In addition, in addition to producing the Doppler frequency required for ISAR lateral resolution, the target rotation will also cause the target scattering point to move more Doppler units, resulting in ISAR image defocus, which needs to be corrected

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  • Correction method for ISAR (Inverse Synthetic Aperture Radar) transverse scaling and Doppler-through movement based on revised Newton iteration
  • Correction method for ISAR (Inverse Synthetic Aperture Radar) transverse scaling and Doppler-through movement based on revised Newton iteration
  • Correction method for ISAR (Inverse Synthetic Aperture Radar) transverse scaling and Doppler-through movement based on revised Newton iteration

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[0067] The present invention will be further described below in conjunction with accompanying drawing:

[0068] figure 1 It is the general processing flow of the present invention.

[0069] According to the present invention, a modified Newton iteration-based ISAR lateral calibration and more Doppler unit walking correction method mainly includes the following steps:

[0070] S1 performs translation compensation on the original echo of the target, and obtains the one-dimensional range image sequence of the target after target translation compensation;

[0071] S2 Obtain the ISAR image entropy about the target speed ω and the ordinate y of the equivalent rotation center O Gradient and Hessian matrix;

[0072] S3 corrects the Hessian matrix;

[0073] S4 uses the modified Newton iterative method to estimate the target speed and equivalent rotation center to realize ISAR lateral calibration and more Doppler unit walking correction.

[0074] figure 2 ISAR images before calib...

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Abstract

The invention belongs to the field of radar signal processing and in particular relates to a correction method for ISAR (Inverse Synthetic Aperture Radar) transverse scaling and Doppler-through movement based on revised Newton iteration. The correction method comprises the following steps: S1, carrying out translation compensation on target original echoes and acquiring a one-dimensional range profile sequence after target translation compensation is carried out; S2, acquiring a gradient of an ISAR image entropy relative to a target rotary speed omega and an equivalent rotary center longitudinal coordinate yO and a Hessian matrix; S3, revising the Hessian matrix; S4, estimating the target rotary speed and an equivalent rotary center through a revised Newton iteration method, so as to realize ISAR transverse scaling and Doppler-through movement correction. According to the correction method provided by the invention, estimation precision of a target rotary angle under conditions including a low signal-to-noise ratio and a sparse pore diameter can be improved, so that the ISAR transverse scaling precision is improved and the Doppler-through movement of a scattering point is corrected; an ISAR image focusing effect is improved. Furthermore, the correction method has the advantages of rapid iteration and convergence speed of the target rotary speed and high calculation efficiency,can be applied to a real-time ISAR imaging system and has important engineering application value.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to an ISAR lateral calibration and Doppler unit walking correction method based on modified Newton iteration. Background technique [0002] Inverse synthetic aperture radar (ISAR) imaging technology can obtain high-resolution two-dimensional images of moving targets, capture target two-dimensional size and structural features, and is an important technical means for space target recognition. It has been used in space target surveillance, missile defense, and aviation control. , radar astronomy and other fields have been widely used. [0003] ISAR horizontal calibration technology converts ISAR image azimuth coordinates from Doppler frequency to actual distance, which is the premise of estimating target size and structure through ISAR image. The target motion can be divided into translation and rotation. After the translation is compensated, the Doppler generated b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S13/904G01S13/9064
Inventor 张双辉刘永祥黎湘霍凯姜卫东龚婷
Owner NAT UNIV OF DEFENSE TECH
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