ANALYSIS OF ARCTIC ACOUSTIC DATA; MODELLING AND PREDICTION OF ARCTIC AMBIENT NOISE CHARACTERISTICS

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Authors
  1. Greening, M.V.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN);Datavision Computing Services Ltd, Victoria BC (CAN)
Abstract
The following report details the work completed on modelling the verical Arctic ambient noise coherence and on estimating source locations from this coherence. A focalization technique which simultaneously determines both source and environmental characteristics is used as the model. This technique allows modelling of multiple broad-band sources and permits bounds on the environmental characteristics. It was found that single sources occurring over large bottom slopes could easily be localized while sources over a flat bottom could only be localized within the range limits of the flat bottom region. Searching for multiple sources is similar with the exception that much more computing time is necessary to sufficiently sample the larger search space. Tests with real data showed that the coherence mismatch varied form 0.04 to 0.09 for data dominated by distant active pressure ridging while mismatch was high as 0.30 for data dominated by local thermal ice cracking. It was also found that three of the data files dominated by distant active pressure ridging gave nearly identical estimated source characteristics.
Report Number
DREP-CR-93-54 — Contract Report
Date of publication
01 Aug 1993
Number of Pages
48
DSTKIM No
93-04657
CANDIS No
134496
Format(s):
Document Image stored on Optical Disk;Originator's fiche received by DSIS

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