Abstract
Problems associated with reliable underwater telemetry are studied in three categories dictated by the degree to which multi-path propagation effects are experienced. The maximum range obtainable under ideal conditions of a typical telemetry system is investigated as a function of the required information bandwidth.The relevant acoustic properties of the sea are summarized and systems, originally used in electromagnetic communication to combat ‘flat’ and ‘frequency selective’ fading are reviewed and their adaptability to thepresent application is discussed. Inter-symbol distortion arising from large differential delays during multi-path propagation is discussed and some proposals are made for the realization of a practical system particularly suitable for underwater telemetry where large path differentials are encountered.
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