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Electromagnetic Target Detection in Uncertain Media: Time-Reversal and Minimum-Variance Algorithms

Publication ,  Journal Article
Liu, D; Krolik, J; Carin, L
Published in: IEEE Transactions on Geoscience and Remote Sensing
April 7, 2007

An experimental study is performed on imaging targets that are situated in a highly scattering environment, employing electromagnetic time-reversal methods. A particular focus is placed on performance when the electrical properties of the background environment (medium) are uncertain. It is assumed that the (unknown) medium characteristic of the scattered fields represents one sample from an underlying random process, with this random process representing our uncertainty in the media properties associated with the scattering measurement. While the specific Green's function associated with the scattered fields is unknown, we assume access to an ensemble of Green's functions sampled from the aforementioned distribution. This ensemble of Green's functions may be used in several ways to mitigate uncertainty in the true Green's function. Specifically, when performing time-reversal imaging, we consider a Green's function as a representative of the average of the ensemble, as well as Green's functions based on a principal components analysis of the ensemble. We also develop a wideband minimum-variance beamformer with environment perturbation constraints, in which the unknown Green's function is constrained to reside in a subspace spanned by the Green's function ensemble. These algorithms are examined using electromagnetic scattering data measured in a canonical set of laboratory experiments. The qualitative performance of the different techniques is presented in the form of images, with quantitative results presented in the form of receiver operating characteristic performance. © 2007, IEEE. All rights reserved.

Duke Scholars

Published In

IEEE Transactions on Geoscience and Remote Sensing

DOI

EISSN

1558-0644

ISSN

0196-2892

Publication Date

April 7, 2007

Volume

45

Issue

4

Start / End Page

934 / 944

Related Subject Headings

  • Geological & Geomatics Engineering
  • 40 Engineering
  • 37 Earth sciences
  • 0909 Geomatic Engineering
  • 0906 Electrical and Electronic Engineering
  • 0404 Geophysics
 

Citation

APA
Chicago
ICMJE
MLA
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Liu, D., Krolik, J., & Carin, L. (2007). Electromagnetic Target Detection in Uncertain Media: Time-Reversal and Minimum-Variance Algorithms. IEEE Transactions on Geoscience and Remote Sensing, 45(4), 934–944. https://doi.org/10.1109/TGRS.2006.890411
Liu, D., J. Krolik, and L. Carin. “Electromagnetic Target Detection in Uncertain Media: Time-Reversal and Minimum-Variance Algorithms.” IEEE Transactions on Geoscience and Remote Sensing 45, no. 4 (April 7, 2007): 934–44. https://doi.org/10.1109/TGRS.2006.890411.
Liu D, Krolik J, Carin L. Electromagnetic Target Detection in Uncertain Media: Time-Reversal and Minimum-Variance Algorithms. IEEE Transactions on Geoscience and Remote Sensing. 2007 Apr 7;45(4):934–44.
Liu, D., et al. “Electromagnetic Target Detection in Uncertain Media: Time-Reversal and Minimum-Variance Algorithms.” IEEE Transactions on Geoscience and Remote Sensing, vol. 45, no. 4, Apr. 2007, pp. 934–44. Scopus, doi:10.1109/TGRS.2006.890411.
Liu D, Krolik J, Carin L. Electromagnetic Target Detection in Uncertain Media: Time-Reversal and Minimum-Variance Algorithms. IEEE Transactions on Geoscience and Remote Sensing. 2007 Apr 7;45(4):934–944.

Published In

IEEE Transactions on Geoscience and Remote Sensing

DOI

EISSN

1558-0644

ISSN

0196-2892

Publication Date

April 7, 2007

Volume

45

Issue

4

Start / End Page

934 / 944

Related Subject Headings

  • Geological & Geomatics Engineering
  • 40 Engineering
  • 37 Earth sciences
  • 0909 Geomatic Engineering
  • 0906 Electrical and Electronic Engineering
  • 0404 Geophysics