| 摘要 |
An underwater communication system wherein communication is achieved through an alternating electric field between spaced-apart pairs of transmitting and receiving electrodes in conductive contact with the water. The transmitting and receiving electrodes are horizontally oriented and two pairs of orthogonally disposed receiving electrodes can be used to provide omnidirectional communication. The receiver is responsive only to properly coded signals. According to one embodiment the receiver responds only to signals of a selected frequency and duration, and is not effected by short bursts of noise or the cumulative effect of short signals. According to other embodiments various different coding and redundancy techniques are employed.
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