A highly directional transducer for multipath mitigation in high-frequency underwater acoustic communications.
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.
American Society for Engineering Education, Washington, DC 20036, USA Simon.freeman.ctr@nrl.navy.mil.
Simon E
SE
Freeman
Naval Research Laboratory, 4555 Overlook Avenue West, Code 7160, Washington, DC 20375, USA Lloyd.emokpae@nrl.navy.mil, Michael.nicholas@nrl.navy.mil, Geoffrey.edelmann@nrl.navy.mil.
Lloyd
L
Emokpae
Naval Research Laboratory, 4555 Overlook Avenue West, Code 7160, Washington, DC 20375, USA Lloyd.emokpae@nrl.navy.mil, Michael.nicholas@nrl.navy.mil, Geoffrey.edelmann@nrl.navy.mil.
Michael
M
Nicholas
Naval Research Laboratory, 4555 Overlook Avenue West, Code 7160, Washington, DC 20375, USA Lloyd.emokpae@nrl.navy.mil, Michael.nicholas@nrl.navy.mil, Geoffrey.edelmann@nrl.navy.mil.
Geoffrey F
GF
Edelmann