Sea Trial Results and Receiver Performance Analysis for Phorcys V0 Waveform

Sea trials of the PhorcysV0 coherent spread spectrum waveform for acoustic communication have been carried out in order to verify range-data rate performance and evaluate various receiver structures. Encouraging results are achieved, in widely differing environments and frequency bands, at ranges between 100 m and 100 km, using frequency bands of 20-28 kHz, 8-12 kHz and 0.8-1.5 kHz, and with net data throughput between 13 bps and 1.6 kbps. In the higher BT modes, robust communication is achievable with a relatively simple correlation based receiver as demonstrated by the Phorcys reference chain. However for the higher throughput modes (lower BT) and in demanding channels, it is shown that there is substantial gain from more complex adaptive receiver structures and multichannel array gain where possible.