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

3aUW3. Detection performance of broadband adaptive matched-field beamforming on a vertical array in shallow water.

Newell O. Booth

Philip W. Schey

Ocean and Atmospheric Sciences Div., NCCOSC RDTE DIV Code 541, San Diego, CA 92152-5001

Quantitative estimates of detection performance are presented for a broadband adaptively processed vertical line array with matched-field replicas. The estimates were obtained with broadband and multitone signal data obtained in the shallow water evaluation cell experiment 3 (SWellEx-3). The experiment was carried out in July 1994 west of Point Loma in 200 m deep water of complex bathymetry. The multitone test signal was transmitted from an acoustic source towed at various depths over complex propagation paths and consisted of five sets of ten tones, each set spanned 50--200 Hz. Each set was transmitted at various levels over 22-dB dynamic range. The beamforming used sets of 8 and 16 hydrophones over 80-m vertical aperture. Detection performance is estimated for various input signal-to-noise ratios by processing sets of frequencies corresponding to the various signal levels. Another set of 10 frequencies which excludes the signal frequencies form the noise only estimates. [Work supported by ONR, Code 321US.]