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Efficient near-field size target isar imaging method based on back projection

A backward projection, size and size technology, applied in the reflection/re-radiation of radio waves, instruments, measuring devices, etc., can solve the problems of unfavorable engineering realization and application expansion, difficulty in maintaining imaging accuracy, and complicated algorithm steps, etc. Real-time performance, less number of Fourier transforms, and improved recognition ability

Active Publication Date: 2022-07-01
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the classic ISAR imaging algorithm and near-field ISAR imaging algorithm based on small-angle scanning observations are no longer applicable, and problems such as image mismatch, squint, angular flicker, and cumbersome algorithm steps are prone to occur during the imaging process, making it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 size target isar imaging method based on back projection
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  • Efficient near-field size target isar imaging method based on back projection

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Embodiment Construction

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

[0040] In one embodiment, as figure 1 As shown, an efficient near-field size 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] Target scattering points: 30; transmitter signal carrier frequency: 19GHz; transmitter signal bandwidth: 6GHz; distance frequency domain sampling points: 201; radar antenna imaging elevation angle: 90 degrees; radar antenna imaging azimuth viewing angle range: (-5°, 5° ); Azimuth viewing angle sampling points: 601; Range resolution: 2.5cm; Azimuth resolution 4.5cm; Radar antenna position: (-5m,0,0); Distance between the radar antenna and the target center scattering point: 5m.

[0043] Step 2: Near-field ISAR Imaging Discrim...

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Abstract

The invention discloses an efficient near-field size target ISAR imaging method based on back projection, comprising: initializing an image data matrix; using the target back electromagnetic scattering echo signal corresponding to the azimuth viewing angle to obtain a distance time domain image; The distance from the radar antenna to the center scattering point of the target, the distance between any scattering point on the target and the radar antenna except the center scattering point, the distance time domain image, and the image data matrix, the imaging results under the current viewing angle are obtained; the imaging results under all viewing angles Superposition is performed to obtain near-field ISAR imaging results. The present invention can realize near-field ISAR fine imaging of large and small targets, reduce the calculation amount, and improve the target detection, recognition and resolution capabilities.

Description

technical field [0001] The invention relates to an efficient near-field size target ISAR imaging method 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 progress of radar imaging technology, radar imaging technology has been widely used in civil and military fields. Radar imaging technology includes 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, of which ISAR is mainly for missiles, aircraft and other aerial targets. Two-dimensional imaging is performed, and because ISAR is not easily interfered by environmental factors such as weather, that is, it has the characteristics of all-weather, all-weather, so ISAR imaging technology is widely used in the fields of national defense, air defense and missile defense, and is a very importan...

Claims

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Application Information

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Patent Type & Authority Patents(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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