ASA 124th Meeting New Orleans 1992 October

4pUW8. Matched-field source localization using incoherent frequency averaging for sound-speed mismatch and array element location errors in a shallow-water environment.

M. A. Akundi

S. Garrel

Phys./Eng. Dept., Xavier Univ. of Louisiana, New Orleans, LA 70125

G. B. Smith

H. A. Chandler

Naval Res. Lab., Stennis Space Center, MS 39529-5004

Matched-field processing is a parameter estimation technique for localizing a source from the acoustic field propagating in a waveguide. The signal is observed at an array in the presence of spatially correlated noise that also propagates in the same ocean environment as the signal. Incoherent broadband averaging is a method that uses the broadband nature of an acoustic source to acquire additional gain against ambient noise and to decrease background variance common to matched-field ambiguity surfaces. Incoherent broadband averaging has been applied earlier [J. Acoust. Soc. Am. Suppl. 1 88, S27 (1990)] for source localization in the presence of random phase error in a Pekeris environment. In this paper, this method is applied using a more general environmental model (SNAP) for source localization in the presence of sound-speed mismatch and array element location errors. Preliminary results indicate that frequency averaging may have some value for localizing a source when these types of mismatch are present. [This work was supported by the Naval Research Laboratory through U.S. NAVY/ASEE Summer Faculty Research Program.] [sup a)]Summer Faculty Research Fellow, NAVY/ASEE Summer Program. [sup b)]Undergraduate student, William Penn Foundation Grant.