Simulation Of A Shallow Water Channel Acoustic Telemetry

Abstract

To be able to select appropriate signal architectures for various underwater acoustic communication channels a computer operable model that simulates the complete communications channel has been developed. The model utilizes time varying impulse responses and windowing techniques to determine the response to any given input signal. Statistical descriptors of the complex impulse and cw responses of the underwater acoustic environment of interest are used to develop the model impulse responses and to modify the input signal. This paper briefly outlines the model, and provides a comparison with some at sea experimental differential phase shift key (DPSK) 11. MODEL DEVELOPMENT The general communication geometry of interest is depicted in Figure 1. As indicated, the source and receiver are in SURFACE BOTTOM Figure 1. Shallow Water Communication With Multiple Paths.

Design and Development of a Programmable Underwater Device for Acoustic Data Recording and Retrieval

“…A PROGRAMMABLE UNDERWATER DEVICE FOR ACOUSTIC DATA RECORDING Phase modulated systems include Differential Phase Shift Keying (DPSK) [7,8], Quadrature Phase Shift Keying (QPSK) and Multiple Differentiai Phase Shift Keying (MDPSK). Phase modulation systems, such as DPSK and QPSK, modulate data by using a different number of phases.…”