ASA 126th Meeting Denver 1993 October 4-8

4aUW2. Sector-focused matched-field inversion for enhanced environmental parameter estimation with reduced sensitivity to measurement errors.

Howard A. Chandler C. Feuillade G. B. Smith

Naval Res. Lab., Stennis Space Center, MS 39529-5004

Sector-focused matched-field localization has been shown to effectively enhance range-depth resolution while remaining insensitive to environmental parameter mismatch. This becomes evident in parameter space ambiguity functions where the response is broad and therefore insensitive to mismatch. For source localization, this is a desirable result. However, for environmental inversion, greater resolution may be desired in parameter space while remaining insensitive to other measurement errors. This may be accomplished by including, in the search sector, replicas derived from a set of ``neighboring'' environmental parameters. The purpose of this study is to investigate the use of sector focusing to increase resolution in environmental parameter space while mitigating against measurement uncertainty. Results will be presented using the KRAKEN normal mode model to simulate a canonical shallow water environment. [Work sponsored by the Office of Naval Research, Program Element 61153N, with technical management provided by NRL-SSC.]