MATCHED-FIELD INVERSION FOR SOURCE LOCALIZATION WITH UNCERTAIN BATHYMETRY

A good knowledge of the bathymetry is required for reliable matched-fi eld source localization in shallow-water environments. However, bathym etry can be difficult to measure in ice-covered Arctic waters. This le tter describes a method for determining source location using simulate d annealing to perform matched-field inversion with poor or little kno wledge of the bathymetry. The inversion is carried out for source rang e and depth and a (range-dependent) model for bathymetry. Although the bathymetry cannot be determined uniquely in this manner, an effective model can be computed which allows accurate source localization. This method essentially applies the concepts of ''focalization'' [M. D. Co llins and W. A. Kuperman, J. Acoust. Soc. Am. 90, 1410-1422 (1992)] to ocean bottom parameters.