title: Separation of sperm whale click-trains for multipath rejection.
abstract: In this paper an algorithm is described for grouping sperm whale clicks received at a single hydrophone into click-trains associated with a given whale and propagation path. To accomplish this, features are extracted from pairs of clicks in order to derive a statistical measure of click similarity. Then, the algorithm maximizes a global measure of similarity between the associated clicks. In addition to grouping clicks according to click-trains, it classifies click-trains into a propagation path (direct, surface, bottom reverberation). The propagation path is identified using a combination of (1) a statistical classifier operating on features extracted from individual clicks and (2) the cross-correlation of click-trains to identify the relative time delays. The algorithm is demonstrated on at-sea recorded data, showing the elimination of time-delay ambiguities associated with the reverberation paths observed at sensor pairs.
authors.affiliation: Naval Undersea Warfare Center, 1176 Howell Street, Newport, Rhode Island 02841, USA. p.m.baggenstoss@ieee.org
authors.forename: Paul M
authors.initials: PM
authors.lastname: Baggenstoss
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D000465:Algorithms; D000818:Animals; D015233:Models, Statistical; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D050661:Sperm Whale / Q000502:physiology*; D013997:Time Factors; D014159:Transducers; D014828:Vocalization, Animal