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Remote Sens. 2009, 1(3), 466-495; doi:10.3390/rs1030466
Review

Ultrawideband Microwave Sensing and Imaging Using Time-Reversal Techniques: A Review

1,*  and 2,*
1 Halliburton Energy Services, 3000 N Sam Houston Pkwy E, Houston, TX, 77032, USA 2 ElectroScience Laboratory, The Ohio State University, 1320 Kinnear Rd, Columbus, OH, 43212, USA
* Authors to whom correspondence should be addressed.
Received: 27 May 2009 / Revised: 13 July 2009 / Accepted: 10 August 2009 / Published: 24 August 2009
(This article belongs to the Special Issue Microwave Remote Sensing)
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Abstract

This paper provides an overview of some time-reversal (TR) techniques for remote sensing and imaging using ultrawideband (UWB) electromagnetic signals in the microwave and millimeter wave range. The TR techniques explore the TR invariance of the wave equation in lossless and stationary media. They provide superresolution and statistical stability, and are therefore quite useful for a number of remote sensing applications. We first discuss the TR concept through a prototypal TR experiment with a discrete scatterer embedded in continuous random media. We then discuss a series of TR-based imaging algorithms employing UWB signals: DORT, space-frequency (SF) imaging and TR-MUSIC. Finally, we consider a dispersion/loss compensation approach for TR applications in dispersive/lossy media, where TR invariance is broken.
Keywords: time-reversal; superresolution; ultrawideband electromagnetic waves; timedomain DORT method; space-frequency (SF) imaging; TR-MUSIC method; short-time Fourier transform; dispersion compensation time-reversal; superresolution; ultrawideband electromagnetic waves; timedomain DORT method; space-frequency (SF) imaging; TR-MUSIC method; short-time Fourier transform; dispersion compensation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yavuz, M.E.; Teixeira, F.L. Ultrawideband Microwave Sensing and Imaging Using Time-Reversal Techniques: A Review. Remote Sens. 2009, 1, 466-495.

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