Underwater Acoustic Channel Characterization for Ultra-Sonic Communication Applications

There is an increase in commercial subsea activity, as well as a growing need to monitor the health of our oceans and rivers. Remote sensors must be deployed underwater. Because of the high level of activity along the coast, in harbours, and even in rivers, the sensors are often deployed in shallow environments. To reduce the costs, small untethered nodes are preferable, and the remote data is transmitted to the surface via a wireless technology. In this work, underwater ultra-sonic communication is proposed to enable a short range telemetry link.

Development and calibration of an acoustic telemetry transmitter for identifying predation events

Acoustic telemetry is a rapidly expanding technology to quantify the movement and behavior of aquatic animals; key for developing effective management for aquatic ecosystems. Acoustic telemetry uses transmitters affixed to aquatic animals that are detected by receivers placed in aquatic ecosystems. An important problem that limits telemetry is the assumption that the detected transmitter represents the originally tagged animal and not a predator that has eaten the tagged animal (i.e. tag is in the predator’s stomach).