Efficient image reconstruction method for a millimeter-wave shoe scanner

David M. Sheen; R. Trevor Clark; Jonathan R. Tedeschi; Jonathan McCall; Trenton S. Hartman; A. Mark Jones

doi:10.1117/12.2560368

23 April 2020 Efficient image reconstruction method for a millimeter-wave shoe scanner

David M. Sheen, R. Trevor Clark, Jonathan R. Tedeschi, Jonathan McCall, Trenton S. Hartman, A. Mark Jones

Proceedings Volume 11411, Passive and Active Millimeter-Wave Imaging XXIII; 114110B (2020) https://doi.org/10.1117/12.2560368
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

The Pacific Northwest National Laboratory (PNNL) has recently developed an active 3D microwave/millimeter-wave shoe scanner. This system is designed to detect threats concealed within the soles of common footwear. The system was designed in response to the security incident involving Richard Reid, known as the “Shoe Bomber”. The system operates over the 10-40 GHz frequency range. Waves in this band readily pass through common shoe materials, such as leather, rubber, plastics, foams, and synthetic and natural cloth materials. The shoe scanner system consists of a linear array positioned underneath a low loss dielectric window that the person is directed to stand upon. The linear array is positioned so the antenna propagation is vertical, and the array axis is horizontal across the width of the shoes. A linear mechanical scan translates the arrays along the length of the shoes. A frequency-modulated continuous wave (FM-CW) transceiver is used to collect the signal scattered from the scene. The data collected from the system is fully 3D covering two spatial and one frequency dimensions. The system presents several challenges for efficient image reconstruction, including the dielectric window, multi-row linear arrays, and focusing close to the antenna elements. The dielectric window presents a significant challenge for image reconstruction since the waves will travel through an inhomogeneous layered media. In this paper, an efficient back-projection reconstruction algorithm is presented that overcomes these challenges. Experimental imaging results are shown that demonstrate high-resolution imaging performance for this new scanner.

Conference Presentation

Citation Download Citation

David M. Sheen, R. Trevor Clark, Jonathan R. Tedeschi, Jonathan McCall, Trenton S. Hartman, and A. Mark Jones "Efficient image reconstruction method for a millimeter-wave shoe scanner", Proc. SPIE 11411, Passive and Active Millimeter-Wave Imaging XXIII, 114110B (23 April 2020); https://doi.org/10.1117/12.2560368

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available