Assessing the performance of omni-directional receivers for passing acoustic detection of vocalizing odontocetes: initial analysis
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Author
Garcia, Jorge F.
Date
2002-12Advisor
Chiu, Ching-Sang
Second Reader
Collins, Curtis A.
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The purpose of this study was to evaluate the performance of passive, omni-directional receivers as means to detect vocalizing Odontocetes. It was necessary to establish probability of detection as a function of a) signal to noise ratio and b) probability of false alarm. For this purpose, a model of the probability distribution function of the detector output was derived from experimental data. For the experiment a series of short duration digital recordings of selected Odontocete vocalizations were broadcast from a moving platform. The vocalizations were monitored and recorded at an underwater array consisting of three vertically distributed hydrophones. Over a period of three days, several hundred iterations of each signal - with the transmitter at ranges varying from 300 meters to 12000 meters - were recorded. A monitoring hydrophone was used to monitor the signal source level. The raw data was fed to two "detectors" consisting of different data processing routines. The output of each detector was subjected to statistical analysis. Other factors also considered in the analysis were: signal used, range, and wind. A statistical test was employed to systematically find a best fit probability distribution function model of detector output. From this empirical model, detector performance was estimated.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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