Development of a Multichannel, Ultrasonic Telemetry System for the Study of Shark Behavior at Sea

Abstract

A telemetry system is described which is capable of monitoring the behavior of free-swimming sharks in the natural environment. The transmitters emit 10 msec ultrasonic pulses at 40 kHz, have a life of up to one week, and a maximum range of over 3 miles. The units can transmit one, four, or eight channels of information using either of two types of electronic multiplexing: one interpulse interval/channel, or fixed time/channel. The pulse rate varies with the value of resistive sensors and ranges from .5/sec to 5/sec. Sensors are described for measuring depth, swimming speed, compass heading, ambient light, and temperature. Single-channel and multichannel transmitters have been used successfully and recovered from pelagic species (blue sharks, Prionace glauca) and from bottom-dwelling species (angel sharks, Squatina california).

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1972
Accession Number
AD0748604

Entities

People

  • Donald R. Nelson
  • Donald W. Ferrel
  • Edward A. Standora Jr.
  • Howard C. Carter
  • Terry C. Sciarrotta

Organizations

  • California State University, Long Beach

Tags

Communities of Interest

  • Advanced Electronics
  • Biomedical
  • C4I
  • Sensors

DTIC Thesaurus Topics

  • Cells
  • Fish
  • Fisheries
  • Habitats
  • Medical Personnel
  • Wildlife

Readers

  • Aquatic Ecology
  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Radar Systems Engineering.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems