ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

2aUW15. Broadband matched-field source localization with a horizontal line array in shallow water.

W. S. Hodgkiss

J. J. Murray

K. H. Kim

G. L. D'Spain

Marine Physical Lab., Scripps Inst. of Oceanogr., La Jolla, CA 92093-0701

SWellEx-3 (shallow water evaluation cell experiment #3) was carried out in July 1994 west of Point Loma in approximately 200 m water. A MPL 64-element vertical array was deployed from the R/P FLIP and the NRaD SWSS (shallow water sensor string) horizontal line array was codeployed 500 m to the east. The focus of this paper is on broadband (70--370 Hz) matched-field source localization with the SWSS horizontal line array. Examples of processing results from a CPA event near endfire using a 300 m subaperture of the HLA will be presented. In order to better understand these results, a comparison will be made with the results from similar processing of the data collected by the VLA over the same period of time. In addition, simulations of the SWellEx-3 environment will be presented showing the effect on the matched-field ambiguity surface of increasing the HLA aperture. [Work supported by ONR, Code 321.]