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Terahertz radar ISAR imaging method

An imaging method, terahertz technology, applied in the field of terahertz radar imaging, can solve the problems of increasing the complexity of motion compensation and failing to meet imaging requirements

Inactive Publication Date: 2014-04-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

These methods are limited to linear chirp signal processing
Due to the sensitivity of terahertz waves to small motions, the linear chirp approximation of the azimuth signal can no longer meet the imaging requirements, which requires the use of nonlinear high-order chirp signal approximation, which further increases the complexity of motion compensation

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  • Terahertz radar ISAR imaging method

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Embodiment Construction

[0043] figure 1 Shown is the relative geometric positional relationship between target 2 and radar 1 at a certain point in the target scene, R(t) represents the distance from the center point of target 2 to radar 1, and r(t) represents the distance from target 2 to radar 1 at a certain point in the scene . The movement of target 2 relative to radar 1 can be decomposed into line-of-sight translation and rotation around the center of the target. The key to consider small-angle ISAR two-dimensional imaging in the terahertz frequency band is the phase compensation step.

[0044] The process flow of a terahertz radar ISAR imaging method is as follows: figure 2 As shown, the specific steps are as follows:

[0045] Step 1: Range processing and range echo FFT:

[0046] Let the chirp signal transmitted by the terahertz radar be s(t), and the target signal received by the radar be s r (t).

[0047] Firstly, delineation and frequency tuning are used, and the specific steps are as ...

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Abstract

The invention discloses a terahertz radar ISAR imaging method. The terahertz radar ISAR imaging method comprises the following steps of carrying out untangle frequency modulation on received echo signals, carrying out Fourier transform on distance-oriented echoes of the echo signals, analyzing the echo signals at a time domain, structuring a kernel function, extracting all parameters of the echo signals on non-linear second-order chirp signals of azimuth-oriented echoes, structuring a penalty function, carrying out motion compensation, and carrying out FFT on the obtained azimuth-oriented echoes to obtain two-dimensional images. According to the terahertz radar ISAR imaging method, high-order chirp signals can be processed, matching search is only carried out in a two-dimensional space for estimating consumed cost, calculation complexity is not high, and the terahertz radar ISAR imaging method is suitable for terahertz radar imaging.

Description

technical field [0001] The invention relates to terahertz radar imaging technology, in particular to a terahertz radar ISAR imaging method. Background technique [0002] Fitting Synthetic Aperture Radar (ISAR) is a two-dimensional high-resolution imaging technique. Using the turntable model to process ISAR imaging is not only simple, but also easy to understand and implement. The key technology to transform the target motion into the target model of the turntable is translation compensation. However, due to the unknown of the target motion characteristics, the motion compensation of ISAR is much more complicated than that of SAR. Due to the uniqueness of its frequency band, terahertz radar is more suitable for achieving extremely large signal bandwidth compared with traditional microwave radar, so as to obtain extremely high distance resolution; the wavelength is shorter, and it is easier to achieve extremely narrow in the terahertz frequency band The antenna beam achieve...

Claims

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S13/904G01S13/9064
Inventor 李晋杨晓波杨元香皮亦鸣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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