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Proceedings Paper

Through-the-wall high-resolution imaging of a human and experimental characterization of the transmission of wall materials
Author(s): S. Nilsson; A. Jänis; M. Gustafsson; J. Kjellgren; Ain Sume
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Paper Abstract

This paper describes the research efforts made at the Swedish Defence Research Agency (FOI) concerning through-the-wall imaging radar, as well as fundamental characterization of various wall materials. These activities are a part of two FOI-projects concerning security sensors in the aspects of Military Operations in Urban Terrain (MOUT) and Homeland Defence. Through-the-wall high resolution imaging of a human between 28-40 GHz has been performed at FOI. The UWB radar that was used is normally a member of the instrumentation of the FOI outdoor RCS test range Lilla Gåra. The armed test person was standing behind different kinds of walls. The radar images were generated by stepping the turntable in azimuth and elevation. The angular resolution in the near-field was improved by refocusing the parabolic antennas, which in combination with the large bandwidth (12 GHz) gave extremely high resolution radar images. A 3D visualization of the person even exposed the handgun tucked into one hip pocket. A qualitative comparison between the experimental results and simulation results (physical optics-based method) will also be presented. The second part of this paper describes results from activities at FOI concerning material characterization in the 2-110 GHz region. The transmission of building, packing and clothing materials has been experimentally determined. The wide-band measurements in free space were carried out with a scalar network analyzer. In this paper results from these characterizations will be presented. Furthermore, an experimental investigation will be reported of how the transmission properties for some moisted materials change as a function of water content and frequency. We will also show experimental results of how the transmission properties of a pine panel are affected when the surface is coated with a thin surface layer of water.

Paper Details

Date Published: 6 October 2008
PDF: 16 pages
Proc. SPIE 7117, Millimetre Wave and Terahertz Sensors and Technology, 71170L (6 October 2008); doi: 10.1117/12.802342
Show Author Affiliations
S. Nilsson, Swedish Defence Research Agency (Sweden)
A. Jänis, Swedish Defence Research Agency (Sweden)
M. Gustafsson, Swedish Defence Research Agency (Sweden)
J. Kjellgren, Swedish Defence Research Agency (Sweden)
Ain Sume, Swedish Defence Research Agency (Sweden)

Published in SPIE Proceedings Vol. 7117:
Millimetre Wave and Terahertz Sensors and Technology
Keith A. Krapels; Neil A. Salmon, Editor(s)

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