Mobile device underwater communications system and method
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.
1. A communications system comprising:
a transmitter having an antenna operable to transmit a data carrying electromagnetic and/or magnetic signal to a remote receiver, and
the remote receiver comprising an antenna for receiving said data carrying electromagnetic and/or magnetic signal;
a processor;
a data interface; and
a control means,
wherein the data interface is operable to transfer data from the data carrying electromagnetic and/or magnetic signal received by the remote receiver to the control means and at least one of the transmitter and the remote receiver is underwater and the other of the transmitter and the remote receiver is above water, and
wherein a near field of said data carrying electromagnetic and/or magnetic signal corresponds to a region around said transmitter wherein at least one of inverse distance squared (1/r 2 ) and inverse distance cubed (1/r 3 ) field components of said data carrying electromagnetic and/or magnetic signal is greater than an inverse distance (1/r) field component thereof.
2. The communications system of claim 1 , wherein each said antenna is an electrically insulated, magnetic coupled antenna.
3. The communications system of claim 1 , wherein each said antenna is an electric field coupled antenna.
4. The communications system of claim 1 , wherein the control means is a second processor.
5. The communications system of claim 1 , wherein the control means is a supervisory control and acquisition system.
6. The communications system of claim 1 , wherein the data carrying electromagnetic signal is carrying control data.
7. The communications system of claim 1 , wherein each said antenna includes at least one of loops and solenoids.
8. The communications system of claim 1 , wherein said remote receiver is operable to communicate within the near field of said data carrying electromagnetic and/or magnetic signal.