Accession Number:

ADA265147

Title:

Multiple Convergence Zone Acoustic Telemetry Feasibility Test Report

Descriptive Note:

Technical rept.

Corporate Author:

WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Report Date:

1991-11-01

Pagination or Media Count:

128.0

Abstract:

This report describes a multiple CZ acoustic telemetry experiment conducted off the coast of California 12890 - 2290. The goal was to design a maximally robust high speed underwater modem suitable for data telemetry for submerged platforms and moorings. Six modulation methods were used to transmit data at rates from 1 to 1000 baud, corresponding to bit rates up to 3kbitsec. The modulation formates were 1 Multiple Frequency Shift Keying MFSK and Binary Expurgated Modulation BEX-PERM 2 Duobinary Frequency Shift Keying 3 Quadrature Phase - Shift Keying QPSK 4 Quadrature Amplitude Modulation 8QAM 5 Continuous Phase Modulation CPM 2DPM4 and 2CPFSK4 and 6 Trellis coded 8PSK. In addition, a large number of channel probe sequences was transmitted in order to estimate channel multipath, fluctuation dynamics and spatial diversity characteristics relevant to acoustic data telemetry. The data was transmitted from a 1 kHz source suspended from the RV McGaw, and received on a multichannel vertical array tended by the RV Point Sur The multichannel data was digitally recorded using floating-point digitizers and stored on optical disk for further processing. Approximate transmission ranges were 70, 140, 200 and 250 km. Approximately 8 hrs of transmission were recorded at each data range.

Subject Categories:

  • Telemetry
  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE