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Proceedings Paper

High-resolution 3D microwave imaging of a moving target using optical motion capture
Author(s): David M. Sheen; R. Trevor Clark; J. Tedeschi; A. Mark Jones; Thomas E. Hall
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Paper Abstract

Active three-dimensional (3D) microwave and millimeter-wave imaging is useful for a variety of applications including concealed weapon detection, in-wall imaging, non-destructive evaluation, and others. High-resolution imaging is usually performed using a fixed two-dimensional planar or cylindrical aperture that is defined using a two-dimensional array or precise mechanical scanning of a transceiver or sequentially-switched linear antenna array. For some applications, it is more convenient to manually translate a linear array over the scene of interest, or equivalently, move the target in front of the linear array to scan an effective aperture. Manually scanning the array or target creates several challenges for accurately focusing, or reconstructing, an image of the target. The motion of the array or target must be known accurately, typically with precision of 0.05-0.1 wavelengths. Additionally, the image reconstruction algorithm needs to be able to compensate for aperture shapes which are highly non-uniformly sampled, and which are not of a specific canonical shape such as planar or cylindrical. This paper explores high-resolution 3D microwave imaging of a moving target by using optical motion capture to track the moving target and develops highly versatile image reconstruction techniques that account for the irregular motion. Several experimental results are shown for moving targets in front of a fixed linear array.

Paper Details

Date Published: 13 May 2019
PDF: 11 pages
Proc. SPIE 10994, Passive and Active Millimeter-Wave Imaging XXII, 109940D (13 May 2019); doi: 10.1117/12.2519892
Show Author Affiliations
David M. Sheen, Pacific Northwest National Lab. (United States)
R. Trevor Clark, Pacific Northwest National Lab. (United States)
J. Tedeschi, Pacific Northwest National Lab. (United States)
A. Mark Jones, Pacific Northwest National Lab. (United States)
Thomas E. Hall, Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 10994:
Passive and Active Millimeter-Wave Imaging XXII
David A. Wikner; Duncan A. Robertson, Editor(s)

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