Comparison of a subrank to a full-rank time-reversal operator in a dynamic ocean

The Journal of the Acoustical Society of America
G F EdelmannDavid C Calvo

Abstract

This paper investigates the application of time-reversal techniques to the detection and ensonification of a target of interest. The focusing method is based on a generalization of time-reversal operator techniques. A subrank time-reversal operator is derived and implemented using a discrete set of transmission beams to ensonify a region of interest. In a dynamic ocean simulation, target focusing using a subrank matrix is shown to be superior to using a full-rank matrix, specifically when the subrank matrix is captured in a period shorter than the coherence time of the modeled environment. Backscatter from the point target was propagated to a vertical 64-element source-receiver array and processed to form the sub-rank time-reversal operator matrix. The eigenvector corresponding to the strongest eigenvalue of the time-reversal operator was shown to focus energy on the target in simulation. Modeled results will be augmented by a limited at-sea experiment conducted on the New Jersey shelf in April-May 2004 measured low-frequency backscattered signal from an artificial target (echo repeater).

References

Jun 27, 2001·The Journal of the Acoustical Society of America·D H Chambers, A K Gautesen
Feb 28, 2002·The Journal of the Acoustical Society of America·Karim G SabraDavid R Dowling
Jun 27, 2002·The Journal of the Acoustical Society of America·J F LingevitchW A Kuperman
Aug 21, 2002·The Journal of the Acoustical Society of America·D H Chambers
Jun 26, 2003·The Journal of the Acoustical Society of America·Thomas FolégotMathias Fink
Jul 26, 2003·The Journal of the Acoustical Society of America·Claire Prada, Jean-Louis Thomas

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