Underwater Acoustic Telemetry for Oceanographical and Limnological Research (Part I)

Abstract

This paper describes the underwater acoustic telemetry system and some results of the field operation of this system. The system consists of two units ; the one is the underwater unit (transmitter) and the other is the deck unit (receiver). The underwater unit is self-contained and can measure water temperature, and transmits the temperature information as a modulated supersonic F-M signal to a hydrophone connected to the deck unit. The received signal is demodulated to recover the original information through the deck unit which is a specially designed F-M discriminater and is then recorded on a D. C. recorder.