24-GHz CW Radar with Beam-Switched Area Coverage for Outdoor Intruder Detection

Mitsutoshi MORINAGA
Toshiyuki NAGASAKU
Hiroshi KONDOH

IEICE TRANSACTIONS on Electronics   Vol.E94-C    No.11    pp.1773-1778
Publication Date: 2011/11/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.1773
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
CW radar,  monopulse radar,  intruder detection,  antenna,  MMIC,  

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A 24-GHz continuous wave (CW) radar with three vertically switched beam antennas for monitoring different range segments has been newly proposed and developed as a means to detect intruders in a fan-shaped ground area with 90 degs. in azimuth and over 10 m in range. This radar can detect moving targets and measure their positions from a tampering-proof height of about 5 m by taking advantage of a two-frequency-CW modulation technique and monopulse scheme used to achieve the wide azimuth coverage. The radar module consists of microstrip-patch planar antennas and monolithic microwave integrated circuits (MMICs), which are placed on the opposite side of a single metal plate to attain compact size and lower cost. An experimental radar successfully detected a human intruder with a position accuracy of 50 cm when moving at 1.4 m/s.