Development of a modified time delay spectrometry technique for underwater acoustic measurements in a multipath environment

Abstract

A measurement techniques has been developed which makes possible the determination of the acoustic transmission loss for various paths between a source and a receiver at a relatively short range in the ocean. The method is based upon a technique called Time Delay Spectrometry (TDS). The theory for utilizing TDS to perform measurements on an underwater test range with a homogeneous water column is presented. The experimental parameters concerning test geometry together with criteria for the source signal are discussed and the limitations are described. A computer program written in HP BASIC is the toll in a multipath measurement system where analog sound signals recorded on tape are processed by an HP 3561A Dynamic Signal Analyzer under program control.