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Ref.: Sea Technology, Vol. 52, No. 3, pp. 32 - 36,
March,2011.
Abstract: In recent years, underwater acoustic networks have
become one of the most challenging topics in ocean acoustics. Generally,
such networks are formed by both fixed and mobile underwater nodes. These
client sensor nodes - such as moored underwater buoys, seafloor sensors and
autonomous underwater vehicles (AUVs) - are simultaneously used to acquire
environmental information and to communicate and relay it from other nodes
in a network fashion.
Typical messaging between nodes consists of small pieces of information,
including the status of the actuators, time, position, speed and commands,
and can be supported by low-data-rate single-transducer modem connections.
However, underwater monitoring and research increasingly requires access to
a shore-based network for transmission of high volumes of information. Large
amounts of data - for example, an optical or acoustic image, a sonar audio
file, or oceanographic measurements - cannot be handled by underwater
single-transducer links with poor power output and limited autonomy.