Preliminary results for glider localization in the Beaufort Duct using broadband acoustic sources at long range

The relatively shallow sound speed minimum known as the Beaufort Duct, present during the Canada Basin Acoustic Propagation Experiment, enabled transmissions from acoustic sources moored within the duct to Seaglider receivers at ranges up to 480 km. The receptions from these broadband sources were used to position the Seagliders at the time of reception both using ranges estimated in real-time and by the acoustic arrival matching (AAM) method, which infers ranges from comparisons with acoustic propagation models in post-processing. Preliminary results indicate that a posteriori data errors are reduced by a factor of 4 or 5 by implementing the AAM localization method.