A highly directional transducer for multipath mitigation in high-frequency underwater acoustic communications | Zendy

Simon E. Freeman | Zendy; Lloyd Emokpae | Zendy; Michael Nicholas | Zendy; Geoffrey F. Edelmann | Zendy

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A highly directional transducer for multipath mitigation in high-frequency underwater acoustic communications

Author(s) -

Simon E. Freeman,

Lloyd Emokpae,

Michael Nicholas,

Geoffrey F. Edelmann

Publication year - 2015

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.4928278

Subject(s) - transmitter , acoustics , multipath propagation , transducer , underwater acoustic communication , underwater , omnidirectional antenna , equalization (audio) , transmission (telecommunications) , channel (broadcasting) , envelope (radar) , delay spread , distortion (music) , computer science , telecommunications , geology , physics , antenna (radio) , bandwidth (computing) , amplifier , radar , oceanography

This paper presents a transducer design of the hollow cylinder type designed to minimize transmission multipath and the need for channel equalization over short acoustic communication distances in shallow water. Operating at 750 kHz, the half-maximum envelope of the main lobe is approximately 3°. The transducer was incorporated into a low-complexity modem system in which it acted as both transmitter and receiver. At-sea testing indicated that the system is capable of operating over horizontal distances of 5 m without evidence of multipath distortion. The system was also found to be effective as an omnidirectional transmitter/receiver in the 10-60 kHz band.

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