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220-GHz imaging radar with 1-Hz frame rate using an array of homodyne transceivers

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Author: Bryllert, T. · Svedin, J. · Karlsson, M. · Gandini, E. · Llombart, N. · Drakinskiy, V. · Stake, J.
Type:article
Date:2018
Publisher: SPIE
Source:Passive and Active Millimeter-Wave Imaging XXI 2018. 18 April 2018 through 19 April 2018, Wikner, D.A.Robertson, D.A., 10634
series:
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 842144
ISBN: 9781510617797
Article number: 1063405
Keywords: Radar · FMCW · Millimeter waves · THz electronics · Electromagnetic simulation · Frequency modulation · Horn antennas · Image resolution · Imaging systems · Imaging techniques · Millimeter waves · Object detection · Optical systems · Radar · Real time systems · Scanning · Submillimeter waves · Terahertz waves · European defense agencies · Frequency-modulated continuous waves · Security application · Simulation technique · System architectures · Radar imaging

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- A nd 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. © 2018 SPIE. The Society of Photo-Optical Instrumentation Engineers (SPIE)