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Abstract:
Report developed under SBIR contract for topic N99-217. The effective use of active sonar systems in littoral environments relies on the accurate knowledge of the acoustic environment. This Phase II SBIR provides a solution to the problem of estimating the local, in-situ geoacoustic properties of the ocean bottom from measured acoustic data. The approach used in the Phase I and Phase II SBIR has been to use Navy standard models for transmission loss and reverberation prediction paired with the Adaptive Simulated Annealing (ASA) algorithm. The use of the ASA algorithm, first tested under the Phase I SBIR, produced significantly reduced run times compared to other variations of simulated annealing. The ASA based inversion software is now called GAIT GS (geoacoustic Inversion Toolkit - Global Search) and PMW-150 has been funding its transition into an OAML product since FY 02. The current software includes ASTRAL 5.1, PE 5.1 and ASPM 5.1 with plans to add Nautilus 1.0 in FY 05. A report from the GAIT V&V committee is expected in late 2004 summarizing the results of their extensive testing of GAIT GS inversion results. Future plans include an extension to inversion of bistatic and multistatic reverberation data.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. 20 Dec 2000-30 Sep 2004 |
| Pages: |
137 |
| Report Date: |
30 SEP 2004 |
| Contract Number: |
N00014-01-C-0087 |
| Report Number: |
A719924 |
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