Underwater communication system
First Claim
1. An underwater communications system comprising:
- an electromagnetic transmitter which transmits electromagnetic and/or magnetic signals to a remote receiver, an optical transmitter which transmits optical signals to said remote receiver;
a data input and a device for selecting one of said electromagnetic transmitter and said optical transmitter;
said electromagnetic transmitter comprising a modulator for modulating input data onto a carrier signal wherein at least one of said electromagnetic transmitter and said remote receiver is underwater and said electromagnetic transmitter and said remote receiver are operable to communicate within a near field of said electromagnetic and/or magnetic signals, said near field of said electromagnetic and/or magnetic signals corresponding to the region around said electromagnetic transmitter where at least one of inverse distance squared (1/r2) and inverse distance cubed (1/r3) field components of said electromagnetic and/or magnetic 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
18 Claims
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1. An underwater communications system comprising:
an electromagnetic transmitter which transmits electromagnetic and/or magnetic signals to a remote receiver, an optical transmitter which transmits optical signals to said remote receiver; a data input and a device for selecting one of said electromagnetic transmitter and said optical transmitter; said electromagnetic transmitter comprising a modulator for modulating input data onto a carrier signal wherein at least one of said electromagnetic transmitter and said remote receiver is underwater and said electromagnetic transmitter and said remote receiver are operable to communicate within a near field of said electromagnetic and/or magnetic signals, said near field of said electromagnetic and/or magnetic signals corresponding to the region around said electromagnetic transmitter where at least one of inverse distance squared (1/r2) and inverse distance cubed (1/r3) field components of said electromagnetic and/or magnetic 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)
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18. An underwater communications system comprising:
- at least one transmitter and at least one remote receiver, said at least one transmitter comprising;
a data input; a modulator for modulating the input data onto a carrier signal;
an antenna operable to transmit modulated electromagnetic and/or magnetic signals to remote receiver and an antenna operable to transmit modulated optical signals to remote receiver, and a device for selecting one of electromagnetic and/or magnetic and optical signals to transmit data, andsaid at least one remote receiver comprising; an antenna for receiving said transmitted electromagnetic and or magnetic signals and an antenna for receiving said transmitted optical signals, wherein at least one of the transmitter and/or remote receiver is underwater.
- at least one transmitter and at least one remote receiver, said at least one transmitter comprising;
Specification