Near-Field Cross Section Imaging of Wideband Millimeter Wave

Yingzhi Kan,Yongfeng Zhu,Qiang Fu

doi:10.1051/matecconf/20165602001

Yingzhi Kan, Yongfeng Zhu + Show 1 more

Open Access

https://doi.org/10.1051/matecconf/20165602001

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Abstract

Near-field millimeter wave imaging has been a hot topic recent years for its importance applications in the area of anti-terrorism. The penetrating characteristic of millimeter wave is of significant importance to security, such as the concealed weapons detection, ground-penetrating radar imaging, through-barrier imaging and so on. Cross section imaging is a basic aspect for near-field millimeter wave imaging, which includes antenna array distribution and wideband signal processing. This paper utilizes back projection method in space area to realize ultra-band near- field cross section imaging. We induce two dimensional direction integral formulas to obtain the reconstruction image of the near-field imaging area, and the simulation results validate the effectiveness of this imaging algorithm.

Highlights

The demand for millimeter wave imaging techniques increases in the field of nondestructive testing (NDT) or in security applications since the threat of terrorism attacks is increasing these years[1, 2]
Some metal commodity may be detected as metal weapons to result in false alarms
The imaging systems like the X-ray imaging system and the millimeter wave imaging system can both be utilized to overcome the defects of metal detectors

Summary

Introduction

The demand for millimeter wave imaging techniques increases in the field of nondestructive testing (NDT) or in security applications since the threat of terrorism attacks is increasing these years[1, 2]. The imaging systems like the X-ray imaging system and the millimeter wave imaging system can both be utilized to overcome the defects of metal detectors. Near-field millimeter wave imaging system, could realize coronal plane imaging, cross section imaging and three dimensional imaging [3, 4]. Cross section imaging achieves two dimensional resolutions by a linear antenna array in one dimension and a wideband signal in another dimension. Near-field cross section imaging mode transmits wideband millimeter wave along a linear array [5]. We introduce the back projection algorithm [6] to directly calculate two dimensional integral of the recorded echo signal in the form of frequency to reconstruct near-field image. This work is important to extend to study the three dimensional near-field millimeter wave imaging

Algorithm description

Direct integral algorithm

Simulation experiment

Conclusions