Abstract: A method includes receiving electric field data regarding an electric field that is detected in an underwater environment by a plurality of electrodes mounted on a first structure, and receiving sensor data from at least one sensor mounted on the first structure. The sensor data relates to a sensed location of a second structure. The method includes determining location data including information regarding a location of the second structure relative to the first structure in the underwater environment based on the sensor data, and determining one or more characteristics of the second structure based on the electric field data and the location data.

Abstract: A method includes receiving electric field data regarding an electric field that is detected in an underwater environment by a plurality of electrodes mounted on a first structure, and receiving sensor data from at least one sensor mounted on the first structure. The sensor data relates to a sensed location of a second structure. The method includes determining location data including information regarding a location of the second structure relative to the first structure in the underwater environment based on the sensor data, and determining one or more characteristics of the second structure based on the electric field data and the location data.

Abstract: A restraint control module is configured to communicate a sync pulse to a sensor. The control module includes a first sync pulse driver and a second sync pulse driver. The first sync pulse driver is connected to a first signal line and the second sync pulse driver connected to a second signal line. The first and second sync pulse drivers being configured to generate a differential sync pulse signal across the first signal line and second signal line using a first signal on the first signal line and a second signal on the second signal line.

Abstract: A restraint control module is configured to communicate a sync pulse to a sensor. The control module includes a first sync pulse driver and a second sync pulse driver. The first sync pulse driver is connected to a first signal line and the second sync pulse driver connected to a second signal line. The first and second sync pulse drivers being configured to generate a differential sync pulse signal across the first signal line and second signal line using a first signal on the first signal line and a second signal on the second signal line.

Abstract: Embodiments of the present invention are generally related to compensation of magnetic data, and, in particular, to a system and method for compensation of magnetic data as collected during autonomous underwater vehicle mapping surveys.

Abstract: Embodiments of the present invention are generally related to compensation of magnetic data, and, in particular, to a system and method for compensation of magnetic data as collected during autonomous underwater vehicle mapping surveys.

Abstract: A loudspeaker is provided that passively achieves a directional polar response at low frequencies with a high degree of attenuation between the front and the back of the loudspeaker. The loudspeaker 11 has a transducer 13, an enclosure 21 behind the transducer, and port openings 29 in the sidewalls 23 of the enclosure to allow a back-wave produced by the transducer to exit the enclosure and combine with the front wave produced by the transducer. Cancellation behind the loudspeaker at low frequencies is achieved by delaying the back wave with low loss. Low loss delay at low frequencies is achieved by inserting a low-density fibrous fill material 33 in the acoustic chamber 27 formed behind the transducer 13 by the enclosure 21. A fibrous material is selected having a low-pass transfer function and low acoustic loss in its low-frequency pass band.

Abstract: The present invention, in various embodiments, is directed to a geophysical system and method in which a transmitter coil is oriented with its axis horizontally, and a sensor is positioned below the coil to measure an ambient electrical and/or magnetic parameter associated with a conductive medium surrounding the at least one transmitter coil.

Abstract: A loudspeaker is provided that passively achieves a directional polar response at low frequencies with a high degree of attenuation between the front and the back of the loudspeaker. The loudspeaker 11 has a transducer 13, an enclosure 21 behind the transducer, and port openings 29 in the sidewalls 23 of the enclosure to allow a back-wave produced by the transducer to exit the enclosure and combine with the front wave produced by the transducer. Cancellation behind the loudspeaker at low frequencies is achieved by delaying the back wave with low loss. Low loss delay at low frequencies is achieved by inserting a low-density fibrous fill material 33 in the acoustic chamber 27 formed behind the transducer 13 by the enclosure 21. A fibrous material is selected having a low-pass transfer function and low acoustic loss in its low-frequency pass band.

Abstract: The present invention, in various embodiments, is directed to a geophysical system and method in which a transmitter coil is oriented with its axis horizontally, and a sensor is positioned below the coil to measure an ambient electrical and/or magnetic parameter associated with a conductive medium surrounding the at least one transmitter coil.

Abstract: The present invention is directed to an underwater drilling system that includes a shuttle for transporting drill rods, geophysical tools, and/or core barrels from the underwater drilling platform to a surface vessel and/or a robotic vehicle to provide power to the underwater drilling platform and monitor and/or control the operation of the underwater drilling platform.