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

3aUW15. Prediction of mismatch dependence and source depth dependence of mismatch-induced peak broadening in matched-field processing.

George B. Smith

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

Nichalos D. Gardner

University of Mississippi, University, MS 38677

In previous work [Smith and Akundi, J. Acoust. Soc. Am. 95, 2980(A) (1994); Smith, Akundi, and Gardner, J. Acoust. Soc. Am. 97, 3292(A) (1995)] analytic expressions for mismatch-induced range and depth localization error and signal gain degradation for a linear correlator matched-field processor were obtained. Those results agreed with previously obtained results [Shang and Wang, J. Acoust. Soc. Am. 89, 2285--2290 (1991)]. In this work the problems of mismatch-induced peak broadening and the mismatch dependence and the source depth dependence of this peak broadening are addressed. Computer simulations are compared to predictions based on the hypothesis that the peak broadening in range and in depth are related to the variances of the distributions of the range shifts and depth shifts, respectively, predicted by the mode pairs. [This work was supported by the Office of Naval Research and by the Mississippi Alliance for Minority Participation (MAMP) program.]

Standards Committee S2 on Mechanical Vibration and Shock. Working group chairs will present reports of their recent progress on writing and processing various shock and vibration standards. There will be a report on the interface of S2 activities with those of ISO/TC 108 (the Technical Advisory Group for ISO/TC 108 consists of members of S2, S3, and other persons not necessarily members of those committees), including a report on the activities of ISO/TC 108, with the plans for its September 1996 meeting in Sydney, Australia. A report will be given on the meetings of ISO/TC 108/SC3 and ISO/TC 108/SC5, held at BSI in London, U.K., during September 1995. Scope of S2: Standards, specifications, methods of measurement and test, and terminology in the fields of mechanical vibration and shock, and condition monitoring and diagnostics of machines, but excluding those aspects which pertain to biological safety, tolerance and comfort.

A special session on ``Hot Topics in Acoustics'' is presented at each meeting of the Society. From several of the Society's technical committees, technical specialty and interdisciplinary groups, a member is chosen to present a tutorial paper on topics of current special interest. The presentations are intended to help acousticians become familiar with issues and achievements that are not within their own primary field of interest.