Accession Number : AD0778683

Title :   Investigation of the Propagation Stability of a Time Spread Underwater Acoustic Channel.

Descriptive Note : Technical rept.,

Corporate Author : MICHIGAN UNIV ANN ARBOR COOLEY ELECTRONICS LAB

Personal Author(s) : Veenkant,Raymond L.

Report Date : MAY 1974

Pagination or Media Count : 175

Abstract : An experimental investigation of analysis and display techniques for extracting stability information from underwater acoustic propagation data has shown the feasibility and usefulness of a specific display format called the Channel Digit Response. All of the complex nature of the channel reception is retained in the display, but the format compresses the data and enhances the extraction of qualitative stability information. The investigation and conclusions are limited to propagation tests using periodic transmissions, as periodic transmissions are the usual type used for studying varying multipath propagation. The investigation data base spanned 133 hours, from a 43 n. mile range across the Straits of Florida. The effective time resolution of the data was .02 seconds. Crosscorrelation, autocorrelation, and power spectrum analysis, and several threshold techniques based on time-lag crosscorrelation were investigated, and their effectiveness compared to the Channel Digit Response. (Author)

Descriptors :   *Underwater sound, *Signal processing, *Information theory, Multipath transmission, Correlation techniques, Stochastic processes, Hydrophones, Power spectra, Computer programs, Florida Strait, Theses

Subject Categories : Physical and Dynamic Oceanography
      Cybernetics
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE