Marine remote sensing toolkit

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# Underwater acoustics

Underwater acoustic sensors (e.g. single beam echo sounders, SONARs and Swath SONAR) are side-looking imaging devices mounted on a vessel or towed behind a vessel. The sensor transmits an acoustic signal, which is then reflected by features on the bottom, after which it is received by the sensor. Like radar and lidar, this is an active Ranging system, measuring distance to target and reflectance. The frequency with which the signal is transmitted determines what features can be discriminated (e.g. top of soft mud or the underlying hard bottom.)

Summary of underwater acoustics see pdf.

## More information

- More information on acoustic sensors
- More information on collecting bathymetry with acoustic sensors
- More on acoustics see

- www.ozcoasts.org.au/geom_geol/toolkit/technical.jsp