Transmission of Acoustic Cross-Spectral Matrices Over Low-Bandwidth Communications Channels


  1. Heard, G.J.
  2. Thomson, D.J.
  3. Ebbeson, G.R.
  4. Verrall, R.I.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
This paper is concerned with an initial look at how to transmit spectral information from a remote underwater acoustic array to a receiver that may be located anywhere on earth. This goal is a common desire in the fields of underwater acoustics, bio-acoustics, and oceanography. The only viable way to succeed at this goal is to make use of satellite telemetry. Unfortunately, restrictions imposed by the necessary satellite coverage (open oceans and polar regions), the costs, and the need for relatively simple, small devices at the remote array location strongly restrict the bandwidth of the communications channel. Previous remote systems have made use of the relatively inexpensive ARGOS satellite system, but these applications are limited to those with extremely low data rates on the order of 0.5-3.5 kBytes/day. The Naval Research Laboratory (NRL) has investigated the other end of the spectrum by employing an 8.5 m-high surface buoy supporting a 1.5 m-diameter, stabilized, satellite transmitting-receiving dish antenna. Neither of these systems are suitable for the majority of remote acoustic array applications: one because the data rate is far too low and the other because of the cost and sheer size of the equipment in addition to the high cost of the satellite time. TRUNCATED
Data rates
Report Number
DREA-SL-1999-131 — Reprint
Date of publication
01 Oct 1999
Number of Pages
Reprinted from
Canadian Acoustics, vol 27, no 3, 1999, p 12-13
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