Abstract
Abstract : Since early 2009 this project has focused on developing an acoustic-ray-based version of synthetic time reversal (STR), a fully-passive technique for recovering the original signal and the source-to-array-element impulse responses for a remote unknown sound source in an unknown underwater waveguide. Along the way, a new method for beamforming (frequency difference beamforming) and a new method for ranging marine mammal calls were developed. The current specific objectives are to: a) assess the performance of STR using 4-by-4 planar hydrophone array recordings in a reverberant laboratory water tank, and b) assess and understand the performance of frequency-difference MFP using ocean propagation measurements made as part of the Kauai Acomms MURI 2011 (KAM11) Experiment. This research effort extends the work on STR to different array configurations, different reverberation levels, longer duration signals, and (possibly) dynamic environments; and extends the prior frequency-difference beamforming work into the realm of MFP.
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