Assessing the performance of omni-directional receivers for passing acoustic detection of vocalizing odontocetes: initial analysis
Garcia, Jorge F.
Collins, Curtis A.
MetadataShow full item record
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.
Approved for public release, distribution is unlimited
Showing items related by title, author, creator and subject.
Spread spectrum signal characteristic estimation using exponential averaging and an ad-hoc chip rate estimator Weber, John Baltzer (Monterey California. Naval Postgraduate School, 2007-03);This dissertation investigates two methods of spread spectrum (SS) signal characteristic estimation for the two principle types of SS systems, frequency-hopped (FH) and direct sequence SS. The exponential averaging detector ...
Assessing the performance of omni-directional receivers for passive acoustic detection of vocalizing odontocetes Daziens, John M. (Monterey, California. Naval Postgraduate School, 2004-06);This study sought to experimentally quantify the sonar performance of omni-directional receivers as a means to passively detect vocalizing Odontocetes. To accomplish this objective, controlled experiments using a calibrated ...
Hache, Joseph Jean Pierre (Monterey, California. Naval Postgraduate School, 1994-09);The greatest-of logic for a constant false alarm rate processor (GO CFAR) is a commonly used method for the adaptive setting of a radar detection threshold in the presence of clutter edges. Instead of using a true envelope ...