Accession Number:

ADA533550

Title:

Differential Frequency Hopping (DFH) Modulation for Underwater Acoustic Communications and Networking

Descriptive Note:

Research rept. 1 Jan 2007-31 Dec 2009

Corporate Author:

WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

2009-10-09

Pagination or Media Count:

16.0

Abstract:

The objective of this effort was to adapt existing differential frequency hopping DFH algorithms developed for terrestrial communications for use in the doubly spread underwater acoustic channel by developing synchronization and demodulation schemes that are robust to various aspects of the environment using the DFH signal itself, and equalization algorithms that exploit available spatial diversity for improving the bit error rate BER. The Sonar Simulation Toolkit SST was used to simulate the propagation of communication sequences through the underwater acoustic environment to specify an ocean environment with a wide variety of parameters relevant to acoustic signal propagation and reception. DFH data collected during at-sea experiments was used as a validation tool for simulated environments and more accurate modeling of underwater environments of interest for DFH-based acoustic communications.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustic Detection and Detectors
  • Acoustics
  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE