This paper provides an overview of more than 12 years of underwater acoustic communication research at the Sonar Department of TNO The Hague. The research covered both point-to-point links and relay networks, from long-range covert communication to short-range high-data-rate communication, for both civil and military applications. The current scientific focus is on wideband modulations and waveforms (multi-scale multi-lag) and on acoustic channel modelling supported by sea trials.
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