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

2aUW12. Broadband matched-field processing of low level signals in shallow water.

Newell Booth

Phil Schey

Ocean and Atmos. Sci. Div., NCCOSC RDTE Div. Code 541, San Diego, CA 92152-5001

Matched-field processing analysis is presented for multitone signals from the shallow water evaluation cell experiment #3 (SWellEx-3) which was carried out in July 1994 west of Point Loma in 200 m water of complex bathymetry. The multitone test signal was transmitted from an acoustic source towed at various depths over tracks designed to test matched-field processing replica generation over complex propagation paths. The multitone signal consisted of 5 sets of 10 tones, each set spanned 50--200 Hz and was transmitted at various levels with 22-dB dynamic range. Using noise level estimates obtained at frequencies between the tones, the input signal + noise-to-noise ratio is estimated. Bartlett and minimum variance distortionless response (MVDR) adaptive matched-field processing results are presented from this data set over various paths for input signal to noise ratios spanning +12 to -10 dB.