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| Number | Title | Issue Date |
| 7226325 | Device for stabilizing re-entrant cavity flows past high-speed underwater vehicles A stabilizing device for a supercavitating vehicle that isolates re-entrant jet flows of liquid from its cavity. The device has a receiving means positioned on the supercavitating vehicle where the re-entrant jet flow impinges on the supercavitating vehicle. An exit... | 06/05/2007 |
| 7020046 | System and method for target motion analysis with intelligent parameter evaluation plot An underwater target tracking capability is disclosed for a grid-search technique utilizing parameter evaluation plot techniques comprising processing acoustic sonar measurements in conjunction with additional kinematics and environmental information. In the impleme... | 03/28/2006 |
| 6940986 | Apparatus and method for remotely and automatically controlling the volume of audio signals produced by a remotely controlled audio device An apparatus and method for remotely and automatically adjusting the volume of a remotely controlled audio device. In one embodiment, the apparatus comprises a sensor circuit for continuously detecting audio signals generated by the audio device, a difference circui... | 09/06/2005 |
| 6921990 | Electronic status monitoring system for security containers An electronic monitoring system is disclosed for detecting the open and closed conditions of containers or cabinets containing confidential or classified information. The electronic monitoring system includes a current sensor that detects the presence of a locking b... | 07/26/2005 |
| 6907940 | Fast response fluid flow control valve/nozzle Disclosed herein is a fast response fluid flow control valve/nozzle that combines the technology used to rupture the frangible discs found in pressurized container-based fire protection/suppression systems with that found in fixed pipe spray/sprinkler systems. The a... | 06/21/2005 |
| 6904860 | Winglet for the trailing end of towed flexible underwater lines A winglet for mounting on a trailing end of a flexible line to be towed by an underwater vehicle includes an internal collar member for connection to an inside surface of the line at the trailing end thereof, an outer collar member for connection to an outside surfa... | 06/14/2005 |
| 6907367 | Time-series segmentation A method for segmenting a signal into segments having similar spectral characteristics is provided. Initially the method generates a table of previous values from older signal values that contains a scoring value for the best segmentation of previous values and a se... | 06/14/2005 |
| 6896003 | High efficiency low actuation force inlet door An inlet system for an inlet in a flow field includes an inlet recess housing having an interior with forward and rear end walls, a base wall, and an opening formed in an upper surface thereof. An intake duct is formed in a rear end wall of the inlet recess. An inle... | 05/24/2005 |
| 6894950 | Underwater vehicle thermal boundary detection system A thermal sensor system is provided in combination with a maneuverable vehicle, particularly in an underwater application. The system includes a transport pipe having an intake and output for the passage of seawater. A thermal sensor is connected to the transport pi... | 05/17/2005 |
| 6880109 | Functional element test tool and method A method and system are provided by the present invention for testing performance validity and accuracy of functional elements of a computer application. A stand-alone test tool provides an environment in which the operation of the functional element can be monitore... | 04/12/2005 |
| 6879543 | Acoustic processing for estimating size of small targets A method is provided for estimating the size of an object from a region of a fluid medium when that object is emitting acoustic radiation of known wavelength λ on its own or as the result of being interrogated by acoustic pulses that reflect from the object. The ac... | 04/12/2005 |
| 6876953 | Narrowband signal processor A method to process narrowband signals includes dividing the signal into segments of length N, where N optimizes filter bandwidth, FFT size, processing and memory. Each N-length segment is processed sequentially by filtering, a FFT and a peak detector that identifie... | 04/05/2005 |
| 6873572 | Low-frequency sonar countermeasure A multi-port projector of acoustic energy in water includes a cylindrical hollow transducer having open annular ends. A thin, flexible member is secured to each annular end to extend across each opening to be displaced by the transducer, and the transducer and flexi... | 03/29/2005 |
| 6873961 | Method and apparatus for identifying and tracking project trends A method and apparatus for computer-assisted project analysis. Planned values for successive times for each of a plurality of parameters are stored in a database. Another database receives measured values of the parameters at the successive times. A statistical anal... | 03/29/2005 |
| 6871610 | Assembly for launching bodies from an underwater platform An assembly for launching bodies from an underwater platform having a pressure hull, and an outer hull subject to free flooding. The assembly includes a module having a proximal end outboard of the pressure hull portion of the platform, a distal end disposed proxima... | 03/29/2005 |
| 6870508 | Antenna for deployment from underwater location A slotted antenna comprises a plurality of loop structures and interconnecting conductors that define a slot. The antennas can operate in a single band or over multiple bands. Flexible or inflatable substrates enable easy storage aboard an underwater craft and facil... | 03/22/2005 |
| 6868042 | Data-based signal definition for frequency domain adaptive beamforming algorithms A data-based technique is disclosed that defines the amplitude and phase of acoustic signals for detection as they propagate across an array of sensor elements for each array incident angle of interest. The definitions of the acoustic signals are then used to constr... | 03/15/2005 |
| 6865523 | Non-linear axisymmetric potential flow boundary model for partially cavitating high speed bodies A method for calculating parameters about an axisymmetric body in a cavity is provided. The user provides data describing the body, a cavity estimate, and convergence tolerances. Boundary element panels are distributed along the body and the estimated cavity. Matric... | 03/08/2005 |
| 6859419 | Laser-based acousto-optic uplink communications technique An apparatus for enabling acousto-optic communication comprising an in-water platform comprising means for emitting an acoustic signal to an acousto-optic interaction zone, an in-air platform comprising the ability for transmitting a first optical interrogation beam... | 02/22/2005 |
| 6854409 | Rotary electromagnetic launch tube An underwater launch system includes a launch tube frangibly sealed at its forward end. At launch time, pressure equalization means introduces water at depth pressure into the launch tube between its frangibly sealed ends. A rotary electromagnetic pump coupled to th... | 02/15/2005 |
| 6856579 | Broadband towed line array with spatial discrimination capabilities A modular sub-array assembly of a composite towed array includes a multi-chamber support structure with plural discrete chambers, an acoustically absorptive hub formed at a central axis of the multi-chamber support structure, and a sensor element in each of the cham... | 02/15/2005 |
| 6856342 | Control circuitry for high speed video camera operation A device for controlling a video camera in underwater high speed photography in a first aspect includes a plurality of spaced break screen or sense coil members, a projectile for launch through the series of break screen or sense coil members, a video camera operate... | 02/15/2005 |
| 6849356 | Separated flow liquid catholyte aluminum hydrogen peroxide seawater semi fuel cell The present invention relates to an improved semi-fuel cell and an improved cathode used therein. The semi-fuel cell stack comprises a housing, an anode within the housing, a porous cathode within the housing, an aqueous catholyte within the housing, an aqueous anol... | 02/01/2005 |
| 6848311 | Method for estimating the properties of a solid material subjected to compressional forces A method to measure the complex frequency-dependent dilatational and shear wavenumbers of a material under a static compressional force. The material is first vibrated in a vertical and horizontal directions while obtaining transfer functions in each direction. The ... | 02/01/2005 |
| 6850173 | Waterway shielding system and method A waterway shield system comprises a plurality of autonomous underwater nodes wherein each underwater node comprises acoustic detectors which may comprise horizontal and/or vertical acoustic arrays which may be directly mounted thereto or extend outwardly therefrom.... | 02/01/2005 |
| 6847211 | Apparatus and method for calibrating voltage spike waveforms for three-phase electrical devices and systems An apparatus and method for calibrating three-phase voltage spike waveforms used in testing three-phase electrical devices. The apparatus includes a circuit having a plurality of phase voltage lines and a ground line. Phase voltage outputs and a ground output are pr... | 01/25/2005 |
| 6845671 | Inverse method to estimate the properties of a flexural beam and the corresponding boundary parameters A system and method is used for estimating the properties of a flexural beam. The beam is shaken transverse to its longitudinal axis. Seven frequency domain transfer functions of displacement are measured at spaced apart locations along the beam. The seven transfer ... | 01/25/2005 |
| 6847212 | Apparatus and method for calibrating voltage spike waveforms An apparatus and method for calibrating single phase voltage spikes used in testing single phase electrical equipment. Capacitance is selected from a capacitor network in order to adjust the single phase voltage spike so as to produce a predetermined voltage spike w... | 01/25/2005 |
| 6840295 | Puncture proof tire employing an elongated body tube having shear resistant film The invention is directed to a high-speed, puncture proof tire including a tire casing having a tread portion and a pair of side wall portions and a plurality of small diameter pressurized tubes disposed within the tire casing. Each pressurized tube has an elongate ... | 01/11/2005 |
| 6837175 | Asymmetric tow system for multiple linear seismic arrays An asymmetric towing system for towing multiple linear arrays includes a tow platform and a single composite tow cable extending from the tow platform and having the multiple linear arrays connected both mechanically and electrically thereto. The composite tow cable... | 01/04/2005 |
| 6834608 | Assembly of underwater bodies and launcher therefor An assembly of underwater bodies and a launcher therefor. The assembly is adapted for mounting on a submarine outside the pressure hull. The assembly includes a launcher having a housing for enclosing an underwater body, a body support structure within the housing f... | 12/28/2004 |
| 6829198 | Electroacoustic transducer having compression screw mechanical bias An electro acoustic transducer has a housing having an axial threaded bore. A transducer driver element is axially aligned in the bore and has a first end mounted on an electrically conductive holder that is axially displaceable by a conductive screw member. A hemis... | 12/07/2004 |
| 6822373 | Broadband triple resonant transducer The present invention relates to a broadband transducer which comprises a tail mass located at a first end of the transducer, an active compliant driver section positioned adjacent the tail mass, a first center mass positioned adjacent an end of the active compliant... | 11/23/2004 |
| 6822928 | Adaptive sonar signal processing method and system A method and system for processing received sonar signals. The method and system generate bearing data signals based on the received sonar signal. The method and system continuously determine the signal strength of the received sonar signal and also continuously det... | 11/23/2004 |
| 6819630 | Iterative decision feedback adaptive equalizer The present invention provides a receiver for underwater acoustic telemetry which combines a decision feedback adaptive equalizer structure with a modified turbo-equalizer structure. The modified turbo-equalizer structure is of significantly reduced complexity becau... | 11/16/2004 |
| 6819230 | Target track crossing prediction/detection A method and system are provided for predicting and detecting the crossing of two target tracks in a bearing versus time coordinate frame. The method/system use a series of periodic bearing measurements of the two target tracks to determine a bearing rate and a proj... | 11/16/2004 |
| 6813219 | Decision feedback equalization pre-processor with turbo equalizer The present invention provides a receiver for underwater acoustic telemetry which combines a decision feedback adaptive equalizer structure with a turbo-equalizer structure. The turbo-equalizer structure is of significantly reduced complexity because the decision fe... | 11/02/2004 |
| 6813218 | Buoyant device for bi-directional acousto-optic signal transfer across the air-water interface A buoy system bi-directionally communicates in-air and underwater. A buoy having a shell to float on water has an upper portion in air and a lower portion in water. An array of acoustic transducers which is disposed in the lower portion receives acoustic signals and... | 11/02/2004 |
| 6809444 | Free rotating integrated motor propulsor An integrated motor propulsor includes a rotor which a plurality of rotor blades adapted to rotate about a center axis. An outer ring surrounding the rotor contacts one of the rotor blades and has a field means positioned on the outer ring. A duct is in low friction... | 10/26/2004 |
| 6806833 | Confined plasma resonance antenna and plasma resonance antenna array A plasma antenna includes a plasma column formed of an ionizable gas. A modulating carrier frequency produces Hertzian dipoles within the plasma that radiate RF energy at the modulating carrier. The antenna, which produces these dipoles, can be short and still produ... | 10/19/2004 |