Demonstrates efficient signal transmission over basin-scale distances, suggesting enhanced communication methods.
Position, navigation, and timing messages to moored, single, acoustic receivers over basin-scale distances are reported. At a 75- Hz center-frequency, the lengthy coherence time allows for successive and long-duration symbol transmissions. Analysis of 2700 spread code M-sequence transmissions from Kauai to Wake Island over a 1.5-year duration predicts a channel capacity of 0.028 bits/(s Hz). Exploiting waveform shift orthogonality properties, a low-SNR telemetry implementation is discussed and performance is estimated from 10 800 observed symbols.
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Gemba et al. (2025) studied this question.
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