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| Number | Title | Issue Date |
| 8045419 | Method for mitigating spatial aliasing The invention as disclosed is a method for mitigating spatial aliasing that takes advantage of the forward motion of towed array elements to overcome the frequency constraints imposed on beam forming by the spatial separation of the array elements. The method employ... | 10/25/2011 |
| 7881156 | Method to estimate towed array angles A towed array is provided with hot-film sensors and anemometer circuitry to calculate the angle of inclination of the towed array in real time during deployment of the towed array in a sea water environment. The hot-film sensors are arranged in pairs along the lengt... | 02/01/2011 |
| 7599253 | Hybrid pressure and vector sensor towed array The invention as disclosed is of a combined acoustic pressure and acoustic vector sensor array, where multiple acoustic pressure sensors are integrated with an acoustic vector sensor in a towed array as a means of resolving the left-right ambiguity of the multiple a... | 10/06/2009 |
| 7518951 | Systems and methods for seismic streamer positioning Systems and methods for determining position of one or more seismic streamers are disclosed. One system embodiment includes a seismic streamer towed by a towing vessel at a first depth; at least one positioning streamer towed by the towing vessel at a second depth d... | 04/14/2009 |
| 7417924 | Apparatus, systems and methods for determining position of marine seismic acoustic receivers Apparatus, systems and methods for calculating position of marine seismic acoustic receivers, and for estimating sound velocity profile of a fluid, are disclosed. One position calculation system includes a vessel, two or more vessel hull-mounted transmitters, a plur... | 08/26/2008 |
| 7376045 | System and method for determining positions of towed marine seismic streamers A system comprises a plurality of acoustic transmitters, mounted inside the streamers, adapted to transmit broadband signals having low cross-correlation between the signals of different transmitters; a plurality of acoustic receivers, mounted inside the streamers, ... | 05/20/2008 |
| 7366056 | Depth sounding by acoustic pingers in a seismic spread An embodiment of a method for conducting a bathymetric survey across a seismic spread includes the steps of emitting a signal from a pinger positioned within the seismic spread, measuring the arrival time of a bottom reflection of the signal at a receiver positioned... | 04/29/2008 |
| 7337216 | Electronic system architecture An electronic system architecture comprises a plurality of client devices connected in a hierarchical structure in which the client devices form nodes in the structure interconnected by communications links. One client device at the top of the hierarchical structure... | 02/26/2008 |
| 7239958 | Apparatus and method for discerning a driver's intent and for aiding the driver Methods and apparatus are provided for determining the intent of a driver of a motor vehicle in moving a trailer towed by the motor vehicle along a desired path. The method comprises the step of positioning a first reference point at a first location spaced apart fr... | 07/03/2007 |
| 7228236 | Subarray matching beamformer apparatus and method A method of beam forming an array, by computer processing a cross covariance, of the reference sub array seismic signal data signal, by having an unknown shape comprising receiving acoustic signals, via the array, and computing the data and segmenting the array into... | 06/05/2007 |
| 7221623 | Expansion coefficient balancing in pressure compensation systems The use of a pressure compensation system and composite polymer materials results in a new type of outboard sensor assembly, of the type used to monitor the status and location of towed array systems from boats. The inventive system is lower in cost, easier to manuf... | 05/22/2007 |
| 7209408 | Distributed, soft-bodied, towable, active acoustic system A towed active acoustic system includes a plurality of soft-bodied, towable, active acoustic modules. The plurality of active acoustic modules are suspended at various depths within the water column, and allow each active acoustic module to be much smaller than know... | 04/24/2007 |
| 7206256 | Pressure compensated composite polymer outboard sensor assembly The use of a pressure compensation system and composite polymer materials results in a new type of outboard sensor assembly, of the type used to monitor the status and location of towed array systems from boats. The inventive system is lower in cost, easier to manuf... | 04/17/2007 |
| 7190636 | Diving suit and environmental detecting system A diving suit and environmental detecting system includes a diving suit and aspirating assembly includes a torso portion, a first arm portion, a second arm portion, a first leg portion, a second leg portion, a head covering, a first glove, a facemask, a second glove... | 03/13/2007 |
| 7173880 | Arrangement with an acoustic array with a sound velocity meter Arrangement with an acoustic array with a sound velocity meter, suitable to be arranged under water. The acoustic array is able to receive acoustic signals from an underwater device and to provide acoustic array output data to a processing arrangement such that the ... | 02/06/2007 |
| 7054229 | Multi-line towed acoustic array shape measurement unit An acoustic array comprising a plurality of nodes attached to two or more lines. Some or all of the nodes include an emitting transducer and a receiving hydrophone, and the balance include only a receiving hydrophone. Each emitting transducer has associated electron... | 05/30/2006 |
| 6847588 | Method for changing the frequency for sampling sonar wavefronts A system and method for processing sonar information from an underwater hydrophone array, at frequencies having wavelengths less than two times a spacing between adjacent hydrophones. The method and system all for processing received underwater waveforms at high fre... | 01/25/2005 |
| 6839302 | Acoustic emitters for use in marine seismic surveying An acoustic emitter for coupling in series in a marine seismic streamer is provided with an annular housing and an annular piezoelectric emitting element positioned coaxially within the housing. This form of construction permits the electrical or electro-optical tra... | 01/04/2005 |
| 6819984 | LOST 2—a positioning system for under water vessels A system for the accurate determination of the position of an underwater vehicle comprising a system observer subsystem having a state velocity update module, a terrain matching module, means for generating a prediction of the terrain matching module's performance a... | 11/16/2004 |
| 6697300 | Method and apparatus for determining the positioning of volumetric sensor array lines Method and apparatus for determining the positioning of volumetric detection array lines. In the case of a sonar array, ultrasonic frequencies are used. Transmitter subsystems including ceramic transducers, and sensors such as hydrophones, are deployed on... | 02/24/2004 |
| 6563762 | Termination assembly for disposal between a marine tow cable and an acoustic receiver array A termination assembly for disposal between a marine tow cable and an acoustic receiver array includes a cable sleeve having a grip portion adapted to grip a cable outer jacket, and a collar portion for disposition on a strength member portion of the cabl... | 05/13/2003 |
| 6525994 | Tracking system and method of operation thereof A method and apparatus for detecting, processing and tracking sonar signals to provide bearing, range and depth information that locates an object in three-dimensions underwater space. A Twenty Six Nearest Neighbor Peak Picker (TSNNPP) is disclosed that i... | 02/25/2003 |
| 6501704 | Underwater object positioning system An underwater object positioning system comprises a workboat, an acoustic transmitter-receiver mounted on the workboat, first and second surface tow units towed by the workboat, an acoustic transducer that is mounted on the first surface tow unit, that is... | 12/31/2002 |
| 6473364 | High frequency acoustic float for the versatile mine system The high frequency response of a versatile exercise mine system that emulates potentially threatening mines is extended by an acoustic float system. A watertight housing is buoyed upward from the mine system and has a first acoustic sensor to provide an o... | 10/29/2002 |
| 6404701 | Encapsulated volumetric acoustic array in the shape of a towed body An encapsulation assembly includes a housing having a nose end, a tail end, and a body portion between the nose end and the tail end. A plurality of acoustic transducers are positioned within the body portion of the housing, each of the plurality of acous... | 06/11/2002 |
| 6385132 | Seismic sensor shroud package A method of and an apparatus for mounting seismic vibration sensors to a cable designed for use offshore, such that the sensors are optimally coupled to the ocean floor through all cylindrical rotations when the cable has reached the bottom after being sl... | 05/07/2002 |
| 6370085 | Extendable hull-mounted sonar system A system to extend transducer arrays from the hull of a vessel while it is underway provides for increased array gain, volumetric aperture (very large aperture arrays), and rejection of hull-bound noise for submarines, surface ships, weapons, and unmanned... | 04/09/2002 |
| 6256264 | Localization of a submerged tow vehicle (lost) The location of a submerged tow vehicle (LOST) system provides a device for accurately determining a position of an underwater vehicle towed by a surface craft or aircraft, such as a helicopter. The LOST system utilizes five sources of input data to compu... | 07/03/2001 |
| 6185154 | Low surface friction acoustic envelope for towed sonar arrays A low friction surface is provided to hose-shaped acoustic envelopes for towed sonar arrays. The low friction surface permits multiple envelopes that are in intimate, parallel contact or that are crossed-over one another, to slide easily relative to one a... | 02/06/2001 |
| 6111817 | Towed body yaw angle sensor A towed body yaw angle sensor arrangement used to sense the angle between the axis of a tow fish and the flow of water. The water flow vector is used as the reference for correcting towed body yaw so that a magnetic compass in the towed body is aligned wi... | 08/29/2000 |
| 5986975 | Drag antenna A drag antenna for a sonar system for detecting and/or locating sources of sound in water includes at least two acoustically sensitive lines positioned side-by-side and laterally spaced apart during a trailing operation. The lines are secured to each othe... | 11/16/1999 |
| 5909408 | Towed acoustic transmitter The invention relates to towed acoustic transmitters forming an underwater vehicle which is itself intended for towing a linear acoustic receiving array (105). It consists in placing the vertical faired acoustic array (303) of such a transmitter at the ve... | 06/01/1999 |
| 5859812 | Self powered underwater acoustic array A self-powered towed underwater sensor is provided. The sensor has a shied casing which encloses an electric generator. The generator is connected to an impeller that is located at the midpoint of the casing. The impeller is covered by a shroud which min... | 01/12/1999 |
| 5784337 | Towed array with non-acoustic sensor module A towed array includes an array of N hydrophone groups and one or more nocoustic sensor modules structurally connected in-line with the array of hydrophone groups. The hydrophone groups and non-acoustic sensor module(s) are coupled to a common data trans... | 07/21/1998 |
| 5781506 | Method and apparatus for frequency filtering using an elastic fluid-filled cylinder A method and system are provided for frequency filtering compressional wave nergy. An elastic cylinder is filled with a fluid that is selected based on a fluid density .rho.i and a dilatational wave phase velocity ci thereof. When the... | 07/14/1998 |
| 5757724 | Zero velocity towed array system A zero velocity towed array system for use in an ocean environment includes towed array subsystem and a deployment vessel. The towed array subsystem comprises a rear drogue, an elongated communication cable having mounted thereon at least one. acoustic se... | 05/26/1998 |
| 5757721 | Inverse method to measure the breathing wave speed in a liquid-filled cylindrical shell Disclosed is an inverse method for measuring the breathing wave speed in a iquid-filled cylindrical shell. The model used with this method is based on an experimental configuration where a shell is attached to a mechanical shaker at the forward end, which ... | 05/26/1998 |
| 5757725 | Dual zero velocity towed array system A dual zero velocity towed array system for use in an ocean environment crises a plurality of towed array subsystems and a deployment vessel. Each towed array subsystems comprises a rear drogue, an elongated communication cable having mounted thereon at ... | 05/26/1998 |
| 5668775 | Methods for determining the position of seismic equipment, and applications of the methods A method for determining the position of seismic equipment wherein acoustic transmitters transmit spread spectrum sequences which are received by the seismic sensors in the equipment whose position has to be determined. By collecting and processing the si... | 09/16/1997 |
| 5532979 | Towed array strain-sensing noise canceller Method and apparatus are disclosed for reducing breathing-wave induced no in a liquid-filled elongate hose housing a hydrophone array. The arrangement involves sensing radial strain induced in the hose wall by the breathing waves (created as the hose is ... | 07/02/1996 |
