Underwater communications system
First Claim
1. An underwater communications system comprising:
- a transmitter which transmits electromagnetic signals to a remote receiver said transmitter comprising a data input;
a modulator for modulating the data onto a carrier signal; and
an electric field coupled antenna for transmitting the modulated signals,wherein at least one of said transmitter and said remote receiver is underwatersaid transmitter and said receiver being operable to communicate within a near field of said electromagnetic signals, said near field of said electromagnetic signals corresponding to the region around said transmitter where at least one of inverse distance squared (1/r2) and inverse distance cubed (1/r3) field components of said electromagnetic signals is greater than an inverse distance (1/r) field component thereof.
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Accused Products
Abstract
An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
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Citations
29 Claims
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1. An underwater communications system comprising:
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a transmitter which transmits electromagnetic signals to a remote receiver said transmitter comprising a data input; a modulator for modulating the data onto a carrier signal; and an electric field coupled antenna for transmitting the modulated signals, wherein at least one of said transmitter and said remote receiver is underwater said transmitter and said receiver being operable to communicate within a near field of said electromagnetic signals, said near field of said electromagnetic signals corresponding to the region around said transmitter where at least one of inverse distance squared (1/r2) and inverse distance cubed (1/r3) field components of said electromagnetic signals is greater than an inverse distance (1/r) field component thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification