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220-GHz imaging radar with 1-Hz frame rate using an array of homodyne transceivers
Author(s): Tomas Bryllert; Jan Svedin; Mikael Karlsson; Erio Gandini; Nuria Llombart; Vladimir Drakinskiy; Jan Stake
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Paper Abstract

We present a 220 GHz imaging radar prototype that has been developed in the European Defense Agency (EDA) project TIPPSI. The purpose of the development was to demonstrate short-range high-resolution 3D imaging for security applications at checkpoints, and to guide the development of stand-off real-time millimeter wave and sub-millimeter wave imaging systems for detection of larger objects at greater distances. An additional goal was to experimentally verify simulation techniques for active (sub)-mmw imaging systems, the verified simulation techniques can then be used to explore different system architectures. The 220 GHz imaging radar prototype consist of a flexible, mechanically scanned optical system that can support linear arrays of transmit/receive (TxRx) units up to 150 mm in length. The optical system is divided into two parts: A compact Dragonian system including the mechanical scanner that can be used as a stand-alone imager at reduced target distance and resolution, and a confocal system that can be added to achieve the full resolution of 1 cm x 1 cm x 1 cm at 4.5 m target distance. The field of view of the full resolution system is 70 cm x 70 cm. The front-end is currently populated by 4 TxRx units that are sparsely distributed along the 150 mm focal plane. The TxRx units operate in frequency modulated continuous wave (FMCW) mode and have a bandwidth of 24 GHz. Each TxRx unit use a single horn antenna and the transmit- and receive signals are generated and received using the same circuits which avoids the need of a duplexer. We will demonstrate high resolution 3D videos taken at 1 Hz frame rate and compare the individual images with simulations using electromagnetic simulators and character/clothes animation.

Paper Details

Date Published: 11 May 2018
PDF: 9 pages
Proc. SPIE 10634, Passive and Active Millimeter-Wave Imaging XXI, 1063405 (11 May 2018); doi: 10.1117/12.2309648
Show Author Affiliations
Tomas Bryllert, Chalmers Univ. of Technology (Sweden)
Jan Svedin, FOI-Swedish Defence Research Agency (Sweden)
Mikael Karlsson, FOI-Swedish Defence Research Agency (Sweden)
Erio Gandini, TNO Defense, Safety and Security (Netherlands)
Nuria Llombart, Technische Univ. Delft (Netherlands)
Vladimir Drakinskiy, Chalmers Univ. of Technology (Sweden)
Jan Stake, Chalmers Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 10634:
Passive and Active Millimeter-Wave Imaging XXI
David A. Wikner; Duncan A. Robertson, Editor(s)

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