A Clutter Rejection Technique Using a Delay-Line for Wall-Penetrating FMCW Radar

Byungjoon KIM  Duksoo KIM  Youngjoon LIM  Dooheon YANG  Sangwook NAM  Jae-Hoon SONG  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.5   pp.597-600
Publication Date: 2016/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.597
Type of Manuscript: BRIEF PAPER
Category: Microwaves, Millimeter-Waves
clutter rejection,  wall-penetrating,  FMCW,  delay-line,  filter,  

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This paper proposes a high clutter-rejection technique for wall-penetrating frequency-modulated continuous-wave (FMCW) radar. FMCW radars are widely used, as they moderate the receiver saturation problem in wall-penetrating applications by attenuating short-range clutter such as wall-clutter. However, conventional FMCW radars require a very high-order high-pass filter (HPF) to attenuate short-range clutter. A delay-line (DL) is exploited to overcome this problem. Time-delay shifts beat frequencies formed by reflection waves. This means that a proper time-delay increases the ratio of target-beat frequency to clutter-beat frequency. Consequently, low-order HPF fully attenuates short-range clutter. A third-order HPF rejects more than 20 dB and 30 dB for clutter located at 6 m and 3 m, respectively, with a target located at 9 m detection with a 10,000 GHz/s chirp rate and a 28 ns delay-line.