Optimum time domsin signal transmission and source location in a waveguide: Ideal waveguide experiments

Abstract

Experimental measurements that were made in an ideal waveguide in air are reported. The experiments confirmed the theoretical technique. Signals transmitted in a waveguide are distorted by the multiple arrivals. A waveguide matched filter has an impulse response that is the time reverse of the impulse response of transmission between a source and receiver. This filter is an optimum filter for the reduction of transmission distortion. The waveguide matched filter is sensitive to source and hydrophone locations, and it can be used to locate a source that transmits an unknown signal. Each signal channel is match filtered for a trial source location. Pairwise cross correlations have a maximum when the trial location is the same as actual source position. [Supported in part by the Shangdong College of Oceanography, People's Republic of China, the Geophysical and Polar Research Center of the University of Wisconsin, and NORDA.]