An Acoustic Transponder System
- 1 June 1966
- journal article
- research article
- Published by Institute of Navigation in NAVIGATION: Journal of the Institute of Navigation
- Vol. 13 (2), 154-161
- https://doi.org/10.1002/j.2161-4296.1966.tb01818.x
Abstract
Acoustic transponders provide a particularly appropriate means for navigating relative to the deep sea floor. Their successful use, however, is dependent on solution of certain engineering problems and on understanding of the sound propagation situation in which the equipment is to be used. During the past year we have developed, built and used a set of appropriate, inexpensive transponders. These allow for selective calling of any one of three units (using pulses at 10.0, 10.5 or 11.0 kc) all of which reply at 12.0 kc. The design lifetime is 106 pulses delivered over a period of up to one year. They have been built primarily to provide tracking information for a deeply towed, unmanned vehicle used for echo sounding and magnetometer observations. With this system useful responses have been obtained to ranges of 8 nautical miles. In normal operation the useful range is limited by the shadow zone formed by upward refraction of the acoustic energy near the sea floor. Use at sea has shown that these elements can provide effective navigational information and has allowed direct observation of the shadowing effects as the principal range limiting factor.Keywords
This publication has 3 references indexed in Scilit:
- Equation for the Speed of Sound in Sea WaterThe Journal of the Acoustical Society of America, 1960
- Basin Plains and Aprons off Southern CaliforniaThe Journal of Geology, 1960
- Speed of Sound in Sea Water as a Function of Temperature, Pressure, and SalinityThe Journal of the Acoustical Society of America, 1960