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.

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.

Abstract: A communication system comprising a communication unit having a local wireless communication mechanism, a remote wireless communication mechanism, a processor, and a power supply; and, at least one of a sensor unit having a sensor mechanism, a local wireless communication mechanism and a power supply. Each of the communication unit and at least one sensor unit is provided in a discreet housing and can be arranged proximal to each other unit to form a cluster. Each local wireless communication mechanism can communicate data to each other local wireless communication mechanism within the cluster. The communication unit remote wireless communication mechanism is operable to communicate outwith the cluster.

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.

Abstract: A flow monitoring system comprising a first temperature sensor located at a reservoir input for measuring input temperature of a fluid in an enhance oil recovery system, a second temperature sensor located at a reservoir output for measuring temperature of output fluid and a processor in communication with the first temperature sensor and the second temperature sensor wherein the first temperature sensor and the second temperature sensor are operable to measure temperature data and communicate the measured data to the processor. The flow monitoring system further comprises a first flow monitor sensor located at the reservoir input for measuring flow of input fluid and the second flow monitoring sensor located at the reservoir output for measuring output fluid flow wherein the first and second flow monitoring sensors are operable to communicate measured flow data to the processor.

Abstract: An underwater navigation system comprising a transmitter (12) for transmitting an electromagnetic signal, a receiver (14) for receiving an electromagnetic signal from the transmitter, and determining means for determining the position of the receiver relative to the transmitter using the received electromagnetic signal. The system determining means may determining the direction of propagation using field strength at three or more receiver locations by determining the direction of propagation by comparison of the field strength received at each antenna, or by comparison of the field strength received at three or more different receiver locations.

Abstract: A subsea structure monitoring system comprising a plurality of sensor nodes distributed across the subsea structure, each wireless node comprising a sensor unit, a processor unit, and transmission unit wherein the sensor unit comprises at least one sensor which is operable to measure at least one environment variable, the sensed data is processed by the processor unit and is operable to be transmitted onwards to a transmission unit.

Abstract: An underwater communications network comprising a plurality of communication nodes operable to wirelessly communicate with at least one other node in the network, each node having a transceiver and an observation mechanism wherein the observation mechanism is operable to monitor signals received by the transceiver and upon reception of a first predetermined tone the observation mechanism outputs a signal operable to adjust the node from a passive operation mode to an active operation mode. Each node can be a discreet underwater device.

Abstract: A flow monitoring system comprising a first temperature sensor located at a reservoir input for measuring input temperature of a fluid in an enhance oil recovery system, a second temperature sensor located at a reservoir output for measuring temperature of output fluid and a processor in communication with the first temperature sensor and the second temperature sensor wherein the first temperature sensor and the second temperature sensor are operable to measure temperature data and communicate the measured data to the processor. The flow monitoring system further comprises a first flow monitor sensor located at the reservoir input for measuring flow of input fluid and the second flow monitoring sensor located at the reservoir output for measuring output fluid flow wherein the first and second flow monitoring sensors are operable to communicate measured flow data to the processor.

Abstract: A wireless communication system network for use with at least one underwater structure, the said communication system network comprising a plurality of communications units disposed around the underwater structure, each communication unit comprising a wireless transmitter, and a wireless receiver, wherein each communication unit is arranged with communicable range of at least three other communication units to form a mesh of communication units operable to work as a network and each communication unit is operable to perform as a master communication unit to at least one of transmit and receive data from the communication system network. The network may extend across multiple static or mobile underwater structures and may be a dynamic network.

Abstract: An underwater communications network comprising a plurality of communication nodes operable to wirelessly communicate with at least one other node in the network, each node having a transceiver and an observation mechanism wherein the observation mechanism is operable to monitor signals received by the transceiver and upon reception of a first predetermined tone the observation mechanism outputs a signal operable to adjust the node from a passive operation mode to an active operation mode. Each node can be a discreet underwater device.

Abstract: An antenna system for us in detecting electromagnetic and/or magneto inductive said antenna system further comprising at least two semi-conductor sensor arrays operable to detect in magnetic field component of the electromagnetic and/or magneto-inductive signals, the arrays arranged to be operable for tri-axial detection of the magnetic field component; at least two output means where an output means is associated with each sensor array and operable to output a signal indicative of the detected magnetic field; and detection means operable to receive said sensor array outputs and operable to act upon said received outputs to generate a signal indicative of the detected electromagnetic and/or magneto-inductive signal.

Abstract: The present invention relates to a transfer system for providing wireless data transfer, electrical power transfer and navigation between a mobile subsea vehicle and a deployed subsea station that uses acoustic and electromagnetic carrier signals for wireless communication and navigation. An inductive connector is provided for power transfer between mobile subsea vehicle and a deployed subsea station without conductive contact.

Abstract: An underwater system (10) comprising a transmitter (12) for broadcasting an electromagnetic synchronization signal and at least one node (14) that has a receiver for receiving that signal, the node being adapted to use the received signal for synchronization.

Abstract: The present invention discloses a system that implements data communications through a barrier composed of composite, layered materials. A low frequency electromagnetic signal is used to achieve acceptable channel losses as the signal passes through a composite barrier which may comprise materials with variable conductivity and/or permeability.

Abstract: The present invention discloses a tagging and identification device and system for tracking and monitoring sea vessels as they enter sea ports, estuaries and/or other channels. The tagging device of the present invention comprises a receiver, for receiving an underwater electromagnetic signal transmitted by an underwater beacon. An acoustic transmitter is provided for transmitting an identification signal to an acoustic receiver deployed nearby. The acoustic identification signal is transmitted after an electromagnetic trigger signal is received from the underwater beacon. The tagging and device may further comprise a memory device which can store data relating to position and time of the see vessel to which it is attached. The tagging and identification device of the present invention is covert, compact and is capable of extended active deployment without replenishment of batteries etc.

Abstract: A signal coupling system for data and/or power signalling in tubing within a hydrocarbon extraction well. First and second transceivers are arranged with primary and secondary loops lying orthogonal to the ends of the transceivers. The transceivers can be narrower for access downhole. Each loop is housed in a semi-cylindrical housing with a planar face, so providing a cylindrical body when oppositely arranged for the transfer of electromagnetic radiation therebetween. Guiding surfaces are also provided on the housing to assist in bring the coupling system together downhole. The present invention provides reliable real-time data from any location within the wellbore and improves reservoir management, well planning and resource exploitation.

Abstract: A pipeline instrumentation and control system comprising a first electrically insulated radiating cable for controlled radiation and reception of electromagnetic signaling carried to a second electrically insulated radiating cable wherein first and second electrically insulated radiating cables are axially disposed along a production well pipe and wherein first axially radiating cable comprises a section configured to substantially overlap second radiating cable section and further wherein electrical signals present in first radiating cable section is configured to induce a corresponding signal in said second radiating cable section to facilitate the transfer of electromagnetic radiation therebetween. The present invention provides reliable data communication from any location within the production system and improves reservoir management, well planning and resource exploitation.

Abstract: A signal coupling system for data and/or power signalling in a confined space such as in tubing within a hydrocarbon extraction well. First and second transceivers are arranged with primary and secondary loops lying orthogonal to the ends of the transceivers. The transceivers can be narrower for access to confined spaces. Each loop is housed in a semi-cylindrical housing with a planar face, so providing a cylindrical body when oppositely arranged for the transfer of electromagnetic radiation therebetween. Guiding surfaces are also provided on the housing to assist in bring the coupling system together in the confined space.

Abstract: The present invention discloses an antenna for coupling to a magnetic field component of an electromagnetic signal. The antenna comprises a coil of wire 121 having a pair of terminals 122 formed over an extended core 130 of a material having a relative magnetic permeability (?R) greater than unity. The extended core 130 comprises an elongate portion 135 having a long dimension along a first (Z) axis and short dimensions in a (X, Y) plane perpendicular to the first axis, and comprises first and second ends 133, 134 at opposite extremities of the long dimension. The extended core 130 further comprises at least one flange portion, 136, 137, disposed at one of the first and said second ends 133, 134 of the elongate section 135, having at least one larger dimension than the elongate section in the (X, Y) perpendicular plane.