Electromagnetic time-reversal imaging of a target in a cluttered environment

Dehong Liu, Gang Kang, Ling Li, Ye Chen, Sathyanarayanan Vasudevan, William Joines, Qing Huo Liu, Jeffrey Krolik, Lawrence Carin

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149 Scopus citations


Electromagnetic time-reversal imaging is addressed for a target situated in a cluttered background. We first investigate the theory of electromagnetic time-reversal imaging, followed by an experimental demonstration. A transmitter-receiver antenna array is connected to a network analyzer and applied to transmit wideband waveforms for detecting a target within a cluttered environment. We assume the cluttered background is fixed, thus the target signature is extracted by observing changes manifested by the introduction of a target. A numerical algorithm is required for computation of the Green's function employed within the time-reversal imager, with this implemented here via ray tracing. Example time-reversal images of different cluttered backgrounds and different targets are presented using measured data, with comparisons to a traditional radar imaging technique. Results show that the time-reversal imagery yields good focusing at the target, significantly better than when the background is not accounted for. © 2005 IEEE.
Original languageEnglish (US)
Pages (from-to)3058-3066
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Issue number9
StatePublished - Sep 1 2005
Externally publishedYes

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