ASA 130th Meeting - St. Louis, MO - 1995 Nov 27 .. Dec 01

3aUW4. HLA/VLA broadband adaptive beamforming detection performance comparison in shallow water.

William S. Hodgkiss

James J. Murray

Gerald L. D'Spain

Katherine H. Kim

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

Newell O. Booth

Philip W. Schey

Joe Rice

NCCOSC RDTE DIV Code 541, San Diego, CA 92152-5001

A broadband adaptive beamforming detection performance comparison is presented for a vertical array with matched-field replica vectors and a horizontal line array with plane-wave replica vectors. The data analyzed consists of both multitone (50--200 Hz) and full broadband (75--150 Hz) transmissions recorded during SWellEx-3 (shallow water evaluation cell experiment 3). SWellEx-3 was carried out in July 1994 west of Point Loma in approximately 200-m-deep water. A MPL vertical array was deployed from the R/P FLIP and the NRaD SWSS (shallow water sensor string) horizontal line array was co-deployed 500 m to the east. Source tows (multitone transmissions) and stations (full broadband transmissions) were carried out at various levels spanning a 22- and 16-dB dynamic range, respectively. Radar data will be included indicating the location and dynamics of interfering noise sources from shipping traffic in the area. [Work supported by ONR, Code 321US.]