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Modal-MUSIC: A passive mode estimation algorithm for partially spanning arrays
F Hunter Akins1, W A Kuperman1
1Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0701, USA fakins@ucsd.edu, wkuperman@ucsd.edu.
Abstract:
State-of-the-art mode estimation methods either utilize active source transmissions or rely on a full-spanning array to extract normal modes from noise radiated by a ship-of-opportunity. Modal-MUSIC, an adaptation of the MUSIC algorithm (best known for direction-of-arrival estimation), extracts normal modes from a moving source of unknown range recorded on a partially spanning vertical line array, given knowledge of the water column sound speed profile. The method is demonstrated on simulations, as well as on data from the SWellEx-96 experiment. Extracted normal modes from ship noise during the experiment are used to successfully localize a multitone source without any geoacoustic information.
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