Time-Reversal MUSIC Imaging with Time-Domain Gating Technique

Heedong CHOI  Yasutaka OGAWA  Toshihiko NISHIMURA  Takeo OHGANE  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.7   pp.2377-2385
Publication Date: 2012/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.2377
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
time-reversal (TR) technique,  TR-MUSIC imaging,  ultra wideband (UWB),  gating technique,  

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A time-reversal (TR) approach with multiple signal classification (MUSIC) provides super-resolution for detection and localization using multistatic data collected from an array antenna system. The theory of TR-MUSIC assumes that the number of antenna elements is greater than that of scatterers (targets). Furthermore, it requires many sets of frequency-domain data (snapshots) in seriously noisy environments. Unfortunately, these conditions are not practical for real environments due to the restriction of a reasonable antenna structure as well as limited measurement time. We propose an approach that treats both noise reduction and relaxation of the transceiver restriction by using a time-domain gating technique accompanied with the Fourier transform before applying the TR-MUSIC imaging algorithm. Instead of utilizing the conventional multistatic data matrix (MDM), we employ a modified MDM obtained from the gating technique. The resulting imaging functions yield more reliable images with only a few snapshots regardless of the limitation of the antenna arrays.