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Efficient near-field large-size and small-size target ISAR imaging method based on backward projection

A technology of backward projection and size, which is applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve problems such as unfavorable engineering realization and application expansion, difficulty in maintaining imaging accuracy, cumbersome algorithm steps, etc., to achieve enhanced Real-time performance, less number of Fourier transforms, and improved recognition ability

Active Publication Date: 2022-05-13
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

Therefore, the classic ISAR imaging algorithm and near-field ISAR imaging algorithm based on small-angle scanning observations are no longer applicable, and problems such as image mismatch, squint, angular flicker, and cumbersome algorithm steps are prone to occur during the imaging process, making it difficult to maintain imaging accuracy. Conducive to engineering realization and application expansion

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  • Efficient near-field large-size and small-size target ISAR imaging method based on backward projection
  • Efficient near-field large-size and small-size target ISAR imaging method based on backward projection
  • Efficient near-field large-size and small-size target ISAR imaging method based on backward projection

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[0039] The technical solutions and the achieved effects of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] In one embodiment, such as figure 1 As shown, an efficient near-field large and small target ISAR imaging method based on back projection is provided, and the specific implementation steps are as follows:

[0041] Step 1: Set the basic parameters of near-field ISAR imaging

[0042] Number of target scattering points: 30; Transmitting signal carrier frequency: 19GHz; Transmitting signal bandwidth: 6GHz; Sampling points in distance frequency domain: 201; Radar antenna imaging elevation viewing angle: 90 degrees; Radar antenna imaging azimuth viewing angle range: (-5°, 5° ); Azimuth viewing angle sampling points: 601; Distance resolution: 2.5cm; Azimuth resolution: 4.5cm; Radar antenna position: (-5m,0,0); Distance between radar antenna and target center scattering point: 5m.

[0043] St...

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Abstract

The invention discloses an efficient near-field large-size and small-size target ISAR imaging method based on backward projection. The method comprises the steps that an image data matrix is initialized; acquiring a distance time domain image by using a target backward electromagnetic scattering echo signal corresponding to the azimuth view angle; based on the distance from the radar antenna to the central scattering point of the target, the distance between any scattering point on the target except the central scattering point and the radar antenna, the distance time domain image and the image data matrix, obtaining an imaging result under the current visual angle; and superposing imaging results under all visual angles to obtain a near-field ISAR imaging result. According to the method, near-field ISAR fine imaging of targets with large and small sizes can be realized, the operand is reduced, and the target detection, recognition and resolution capabilities are improved.

Description

technical field [0001] The invention relates to an ISAR imaging method for high-efficiency near-field large and small targets based on back projection, and belongs to the technical field of radar signal processing microwave imaging. Background technique [0002] In recent years, with the continuous improvement of radar imaging technology, radar imaging technology has been widely used in civil and military fields. Radar imaging technology includes synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging and inverse synthetic aperture radar (ISAR) imaging, both of which use the relative motion of the target and the radar for imaging, among which ISAR is mainly for missiles, aircraft and other air targets Carry out two-dimensional imaging, and because ISAR is not easily disturbed by weather and other environmental factors, that is, it has the characteristics of all-weather and all-weather, so ISAR imaging technology is widely used in the fields of national defense, air ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9064G01S7/41
Inventor 黄柏圣陈小娇
Owner NANJING UNIV OF INFORMATION SCI & TECH
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