2025_proceedings: Basin-scale telemetry observations between the Kauai Beacon source and Wake Island

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  • Session: 12. Observing the Oceans Acoustically
    Organised by: Bruce Howe, Kay Gemba
  • Lecture: Basin-scale telemetry observations between the Kauai Beacon source and Wake Island [[invited]]
    Paper ID: 2210
    Author(s): Kay Gemba, Geoffrey Edelmann
    Presenter: Kay Gemba
    Abstract: Position, navigation, and timing messages are transmitted to slow-moving, single acoustic receivers over basin-scale distances. At a 75 Hz center-frequency, the lengthy coherence time allows for successive and long-duration symbol transmissions. Analysis of 2,700 M-sequence transmissions from Kauai to Wake Island receiver H11S2 over a 1.5-year duration yield a mean channel capacity of 0.028 bits/(s Hz). A low-SNR telemetry implementation, based on the same data, achieves a gross spectral efficiency of 0.0026 bits/(s Hz). By decoding 10,800 transmitted symbols, the empirical probability of symbol as a function of SNR is determined.
  • Corresponding author: Prof Kay Gemba
    Affiliation: Naval Postgraduate School
    Country: United States

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