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| Number | Title | Issue Date |
| 7623409 | Array plate apparatus having tunable isolation characteristics An apparatus having an array plate and an isolation section joined to the perimetrical edge of the plate. The isolation section has a plurality of isolation layers and a plurality of intermediate layers alternately arranged wherein an intermediate layer is positione... | 11/24/2009 |
| 7596054 | Suppressed feature waveform for modulated sonar transmission A suppressed feature waveform sonar transmission is produced by modulating a carrier wave with a baseband waveform that is generated from a known pulse sequence. A waveform embodiment of the pulse sequence is modified to create interference among the primary lobes o... | 09/29/2009 |
| 7349292 | Increased effective aperture for receive arrays A sonar dome having an acoustic array housed therein. A plurality of bubbles are generated within the fluid inside the sonar dome. The generated bubbles are of an amount and size to reduce the speed of sound within the sonar dome fluid. Reduction of the speed of sou... | 03/25/2008 |
| 7318499 | Noise suppression structure and method of making the same An integrated noise suppression acoustic panel includes a back plate, a face plate, and a bulk foam absorber disposed between the back plate and the face plate. The bulk foam absorber is formed of a thermoset material, such as bismaleimide or phenolic, and is manufa... | 01/15/2008 |
| 7289038 | Underwater sound radiation apparatus A plurality of actuators are provided at predetermined intervals on the reverse surface of a predetermined side wall of a swimming pool. When an electric signal corresponding to a sound to be propagated in the water is given to the actuators, the electric signal is ... | 10/30/2007 |
| 7263028 | Composite acoustic attenuation materials The present invention provides means of enhancing the acoustic attenuation and vibration damping of a material by (1) embedding a plurality of small particles of either a high characteristic acoustic impedance or a low characteristic acoustic impedance or combinatio... | 08/28/2007 |
| 7257048 | Countermeasure system and method to emulate target with spatial extent An acoustic countermeasure system comprises a plurality of individual countermeasure devices which act in concert to emulate a target with spatial extent. The individual countermeasure devices may be programmed to navigate into predetermined positions within a prese... | 08/14/2007 |
| 7257521 | Support system, and computer-readable recording medium in which support program is recorded An apparatus concurrently executing designing of a mechanism and developing of embedded software. A three-dimensional-mechanism model simulates an operation of the mechanism, an embedded software developing section develops a control program to control the designing... | 08/14/2007 |
| 7251196 | Passive optical detection of underwater sound A passive acoustic sensor that may be employed to detect sounds emanating from under the surface of a body of water. The sensor uses optics to determine vibration on the surface of a water body to detect sound pressure waves from underwater sound sources. The sensor... | 07/31/2007 |
| 7239216 | Semiconductor memory device with data bus scheme for reducing high frequency noise A semiconductor memory device includes memory modules which have memories and a data bus which transfers data to the memory modules, in which the data bus comprises a low frequency band data pass unit which removes the high frequency component of the data and sends ... | 07/03/2007 |
| 7226656 | Thermoformable acoustic sheet A thermoformable acoustic sheet formed by a compressed fibrous web including high melt and adhesive thermoplastic fibres in which the adhesive fibres are at least partially melted so that in the compressed web the adhesive fibres at least partially coat the high mel... | 06/05/2007 |
| 7226015 | Aircraft and missile forebody flow control device and method of controlling flow The present invention relates to a forebody flow control system and more particularly to aircraft or missile flow control system for enhanced maneuverability and stabilization at high angles of attack. The present invention further relates to a method of operating t... | 06/05/2007 |
| 7219612 | Naval ship decoy A method for defeating or reducing the effectiveness of efforts to detect, track or target a naval vessel by means of its characteristic underwater and electrical fields. In this method, a wave form which mimics the characteristic electrical field produced by a part... | 05/22/2007 |
| 7218571 | Magnetically driven underwater pulse generator An apparatus and method for magnetically generating an underwater high pressure pulse of sufficient strength to destroy underwater threats utilizes a pair of electrically conductive elements. The electrically conductive elements are arranged substantially parallel w... | 05/15/2007 |
| 7164622 | Acoustic propagation delay measurements using transmission of known broad bandwidth waveforms A system and method in which one or more acoustic projectors transmit broad bandwidth waveforms having known characteristics, and one or more acoustic receivers detect the transmitted waveforms, with the measurement of a propagation time from the projectors to the r... | 01/16/2007 |
| 7164699 | Compact, high-power, low-jitter, semiconductor modelocked laser module A low-jitter optical pulse source including: a monolithic waveguide including a first section substantially perpendicular to a first facet and a second section being curved and substantially non-perpendicular to a second facet; and, an optical circulator coupled to ... | 01/16/2007 |
| 7154811 | Simulator for developing acoustic detector of underwater vehicle A simulator for developing an acoustic detector of underwater vehicle precisely verifies performance of an acoustic detector by simulating an actual underwater environment, including target signal, applied to an underwater vehicle. The simulator an I/O communication... | 12/26/2006 |
| 7134342 | Magnetic infrasound sensor A magnetic infrasound sensor is produced by constraining a permanent magnet inside a magnetic potential well above the surface of superconducting material. The magnetic infrasound sensor measures the position or movement of the permanent magnet within the magnetic p... | 11/14/2006 |
| 7120088 | Array system for supercavitating hydrofoils A sonar system includes a forward looking array which is embedded in a cavitator for generating a gaseous cavity which minimizes hydrodynamic noise resulting from turbulent pressure fluctuations. A marine vessel incorporating the sonar system includes a hull, a hydr... | 10/10/2006 |
| 7064503 | Active noise compensation A method is for controlling a multi-phase electrical ship propulsion motor that is supplied with electric energy via a power converter. The ship propulsion motor is preferably a permanently excited motor with at least three windings. The phase currents flowing in th... | 06/20/2006 |
| 7032530 | Submarine air bag launch assembly An air bag launch assembly is disclosed which allows for modular loading onto a submarine, the launch of weapons or vehicles external to the submarine pressure hull, while also achieving greater packing density. The air bag launch assembly includes a large, watertig... | 04/25/2006 |
| 7017415 | Apparatus for sensing pressure fluctuations in a hostile environment A pressure sensor (52) for a harsh environment such as the combustion chamber (58) of a gas turbine engine (50). The pressure sensor includes an acoustic waveguide (60) having a sensing portion (66) exposed to the combustion gas in... | 03/28/2006 |
| 7020044 | Apparatus for producing gaseous vapor baffle An apparatus that produces a gaseous vapor baffle that isolates an undersea sonar system from acoustic noise. The apparatus allows for craft carrying undersea sonar systems to travel at relatively high speeds while substantially isolating the undersea sonar systems ... | 03/28/2006 |
| 6961628 | Method and apparatus for tuning compensation parameters A method and apparatus for tuning a feedforward compensation parameter in a motion control system is provided. According to one such embodiment, the method includes the acts of determining an initial value of a feedforward compensation parameter and commanding an in... | 11/01/2005 |
| 6934217 | Countermeasure threat emulator and method A system and method is disclosed for a countermeasure threat emulator (CME) provided in a tubular housing that may be launched from a submarine or ship. The CME electronics include a CPU board for running software, communicating with a computer external to the housi... | 08/23/2005 |
| 6922922 | Amphibious dredging vehicle and method for restoring wetlands using same An amphibious dredging vehicle includes a base including a pair of floatable pontoons linked together in essentially parallel relation; a cutterhead dredge system that is mounted on the base and that includes a cutterhead mounted on the front end portion of the base... | 08/02/2005 |
| 6918299 | Method and apparatus for improving performance of a force balance accelerometer based on a single-coil velocity geophone The invention concerns methods and apparatus for improving the performance of a force-balance accelerometer based upon a conventional, single-coil, velocity geophone. Specifically, the operating temperature range is increased through the use of both a temperature-co... | 07/19/2005 |
| 6744694 | Gaseous cavity for forward-looking sonar quieting A sonar quieting system for a forward-looking sonar array is provided. The sonar quieting system includes a cavitator for forming an envelope, a strut for supporting the cavitator to a marine platform, such as a ship, a forward-looking sonar array mounted to a forwa... | 06/01/2004 |
| 6600694 | Digital signal processor based torpedo counter-measure A system for producing a decoy to enable a target to avoid a homing torpedo that uses a sonar ping signal for homing in on the target comprises a transducer that operates in a receive mode in which it receives sonar signals and produces corresponding elec... | 07/29/2003 |
| 6567341 | Boom system and its use to attenuate underwater sound or shock wave transmission The present invention relates to methods of attenuating underwater transmission of sound or shock waves as well as boom systems designed for such use. The boom system is characterized by a material (e.g., curtain or combination curtain and skirt) which ex... | 05/20/2003 |
| 6547733 | Ultrasound imaging apparatus and method using Golay codes with orthogonal property Ultrasound images are obtained using a set of Golay codes with orthogonal property as ultrasound receiving and transmitting signals. Ultrasound signals having a plurality of codes are transmitted simultaneously by using the orthogonal property of the Gola... | 04/15/2003 |
| 6542109 | Autonomous off-board defensive aids system There is provided an autonomous off-board defensive aids system (100) for use with a host craft (102), for example, with combat aircraft or submarines. More particularly, the host craft (102) deploys a plurality of controllable off-board units (104, 106) ... | 04/01/2003 |
| 6496447 | Target simulation system A target simulation system is used to simulate a target, such as a submarine, for testing of homing projectiles, such as anti-submarine warfare (ASW) torpedoes. The target simulation system includes a target portion having an impact structure and a plural... | 12/17/2002 |
| 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 |
| 6442104 | Underwater background-acoustics synthesizer system and method A synthesizer and method for the generation of underwater background acoustic signals employs digital signal generation and processing in a multiplexed format. The synthesized digital signals comprise components of shaped noise, simple sinusoids, or doubl... | 08/27/2002 |
| 6381196 | Sintered viscoelastic particle vibration damping treatment A damping entity comprises a matrix of plural viscoelastic particles, typically between 0.05 in and 0.5 in in size, which slightly and fixedly contact one another. The particles generally bond with each other at their contact zones and approximately corre... | 04/30/2002 |
| 6341101 | Launchable countermeasure device and method A launchable countermeasure device and method is disclosed that may be selectively operated to produce one or more of a plurality of countermeasure techniques. The device is compatible with presently existing launch control panels that are connected to an... | 01/22/2002 |
| 6256263 | Acoustic sensing countermeasure device and method of determining a threat direction An acoustic sensing countermeasure device is used to sense the direction of a threat projectile or vehicle in addition to countering the threat with noise or interference signals. Countermeasure device includes an acoustic receive array comprised of segme... | 07/03/2001 |
| 6252822 | Countermeasure device with air bag hover system and pressure compensated acoustic projectors A countermeasure device which is supplied with air in order to actively compensate for external water pressure at any depth, is disclosed. The countermeasure includes an air bag hover system and one or more acoustic projectors, both of which are connected... | 06/26/2001 |
| 6222794 | Underwater noise generator actuated by magneto-inductive/acoustic signals An underwater noise generator has a submerged housing containing a receiver section responsive to remotely originating acoustic signals or magneto-inductive signals in the ELF to VLF range. The submerged housing contains a composition that reacts with wat... | 04/24/2001 |
