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Modulated backscatter microwave security sensor
Author(s) -
Cantú Horacio I.,
Fusco Vincent F.
Publication year - 2009
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.24636
Subject(s) - microwave , clutter , envelope detector , bandwidth (computing) , fuze , electrical engineering , electronic engineering , intermediate frequency , radar , engineering , optics , computer science , physics , telecommunications , radio frequency , materials science , amplifier , metallurgy
A system capable of deployment as a microwave security sensor which can automatically reject background clutter is presented. The principle of operation is based on analog homodyne detection using I, Q single side‐band down conversion of an AM backscattered modulating signal envelope. A demonstrator is presented which operates with a carrier frequency of 2 GHz and 500 KHz backscattered signal. When deployed in a multipath rich open plan office environment the S/N ratio obtained at the detection output was better than 20 dB at 20 m range with 20 dBm EIRP in a 2 MHz detection bandwidth despite the presence of time varying and static clutter. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2492–2495, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24636
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