Accession Number : ADD015663

Title :   Adjustable Frequency Diversity Acoustic Communications System.

Descriptive Note : Patent, Filed 13 Dec 88, patented 21 May 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Mackelburg, Gerald R ; Bodzin, Leon J ; McCracken, Howard B ; Diamond, Anthony E

Report Date : 21 May 1991

Pagination or Media Count : 18

Abstract : An underwater acoustic communication system provides an operator with adjustable frequency diversity so that data rates may be tailored to specific multipath environments. Transmitted messages are sent with precursor transmission/reception synchronization data and transmission parameter data so that the receiving communication end will recognize when message data starts, tone length as-well-as the frequency diversity of the transmitted message. Timing is extracted from the data to compensate for Doppler shift.

Descriptors :   *ACOUSTIC COMMUNICATIONS, *FREQUENCY DIVERSITY, *UNDERWATER ACOUSTICS, *MULTIPATH TRANSMISSION, *SETTING(ADJUSTING), ACOUSTICS, DATA RATE, ENVIRONMENTS, LENGTH, PARAMETERS, PRECURSORS, RATES, RECEPTION, UNDERWATER, PATENTS, MESSAGE PROCESSING

Subject Categories : Non-radio Communications
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE