Abstract: A wideband-to-narrowband conversion method and apparatus performs the operational step of receiving an acoustic wideband signal, initially incident on an array of acoustic wideband transducers and subsequently digitized, and in response thereto generating a spatial Wigner bilinear kernel output signal, and the operational step of receiving and spatially bandpass filtering the spatial Wigner bilinear kernel output signal to remove a wideband low frequency portion as well as any unwanted noise therefrom and retain and output only a narrowband portion thereof.

Abstract: An interface system supports a load from a surface. A disc-shaped base member is adapted to be secured to a supporting surface. A flexible member has one portion secured to the base member and another portion extends from the base member in a flexible loop to attach and support a tensile load. A cavity in the base member faces an inner surface thereof and contains an adhesive to secure the one portion of the flexible member, and an opening in the center of the base member extends from the cavity to the outer surface to pass the load-bearing flexible loop from the center of the base member and provide a flexible attachment for the tensile load in the center of the base member.

Abstract: A tool is provided for facilitating angular alignment of a hydrofoil coupled to a mounting block having a flat bottom surface area. The mounting block is pivotally coupled to a cylindrical strut having a longitudinal axis. The tool has a saddle for engaging the cylindrical strut and a plate coupled to the saddle. The plate has an alignment edge that, when positioned by the saddle beneath the flat bottom surface area of the mounting block, forms a desired angle with respect to the longitudinal axis of the cylindrical strut.

Abstract: A system and method are provided for improving vehicle safety in a crash situation for a vehicle having mountable vehicle components. A plurality of pyrotechnic bolts are used to mechanically couple at least a portion of the vehicle components to the vehicle. A force measuring device measures forces experienced by the vehicle during a crash and produces a signal indicative thereof. This signal is compared with a threshold. An activation signal is generated when the threshold is attained. Failure of the pyrotechnic bolts is then initiated in accordance with a prescribed plan.

Abstract: Digital image data is manipulated for improved image visualization and analysis. A two-dimensional image includes relevant subject matter and a substantially homogeneous background that at least partially borders on the relevant subject matter. A first sub-image is defined from the two-dimensional image that includes the relevant subject matter and a reduced amount of the substantially homogeneous background. A second sub-image is defined from the first sub-image that substantially defines just the relevant subject matter. A plurality of image processing options are selected from a library of image processing options. The second sub-image is then processed in accordance with the image processing options to generate image output data. The image output data can be displayed for viewing and/or analysis.

Abstract: A detonation arrestor cuts the detonating cord of a dud line charge to prevent the pressure wave from a nearby explosion from sympathetically detonating the dud line charge. A housing of the detonation arrestor has a transverse passageway to receive the detonating cord of the dud line charge and an axial bore intersecting the passageway. A cutter piston having a cutter blade is disposed in the bore and is sized to permit axial displacement by a shallow dish-shaped diaphragm spring. The diaphragm spring has its center adjacent to one end of the cutter piston and laterally extends from the bore to be secured to the housing along its round periphery in a sealed relationship. The diaphragm spring is formed in the configuration of a Belleville spring from a spring material providing strength, rigidity, and spring modulus to snap to an extended position when displaced to a position past an over center position by an impinging pressure wave.

Abstract: An image processing method improves contrast of relevant subject matter surrounded or partially bordered by a substantially homogeneous background. A first sub-image is defined that includes the relevant subject matter and a reduced amount of the substantially homogeneous background. A second sub-image is defined from the first sub-image that is substantially just the relevant subject matter. If any of the homogeneous background remains, a smoothing routine can be applied to the edges of the second sub-image. The second sub-image can then be re-scaled to a given dynamic range for improved contrast of the relevant subject matter.

Abstract: A self-contained, self-surveying differential GPS base station system and method of operating same are provided. The system and method use a conventional differential GPS base station. The base station's National Marine Electronics Association (NMEA) data sentences identify a determined position of the base station and fix quality information associated with the determined position. The system and method automatically identify the determined position as an acceptable position when the fix quality information associated with the determined position satisfies a selected criteria which is stored on-site. The system and method then automatically average together each acceptable position to generate an updated position. The updated position is automatically supplied to the base station at a prescribed time for use by the base station in generating Radio Technical Commission for Maritime Services (RTCM) differential corrections for transmission over the air waves.

Abstract: An aqueous foam generating system and method are provided. A first solution has particles of a carbomer resin encapsulated within an anhydrous, non-polar, organic hydrophobic surfactant. A second solution, capable of ionizing the carbomer resin, is pumped into an eductor which draws a volumetric portion of the first solution to form a mixture that is sprayed from an aerator to form an aqueous foam having long wet-to-dry transition times.

Abstract: A reconnaissance/surveillance system for remote viewing of a selected location while providing a standoff distance from the selected location for personnel controlling the reconnaissance/surveillance system includes a remote controlled underwater vehicle and a delivery vehicle formed to deliver the remote controlled underwater vehicle to an underwater deployment position. An operator control console in the delivery vehicle is connected to the remote controlled underwater vehicle via a fiber optic communications link. A battery powered propulsion apparatus moves the remote controlled underwater vehicle through water to a viewing station under control of the operator control console. The remote controlled underwater vehicle includes sensing apparatus that provides signals that the operator control console uses to navigate the remote controlled underwater vehicle to the viewing station.

Abstract: An underwater high energy acoustic communications device has inner shell-like structure having an outer surface connected to first ends of tuning springs and outer shell-like structure having an inner surface connected to second ends of the tuning springs to concentrically locate and space the inner and outer structures apart. Explosive units mounted on the inner surface of the outer structure each includes an explosive squib, rigid tube, and projectile. A micro-controller feeds firing signals over electrical leads to the explosive units to detonate them and fire their projectiles to strike the inner structure that emits ringing high-energy broadband acoustic signals that are propagated into surrounding seawater. A transducer connected to the micro controller receives acoustic signals from a remote source to activate the micro-controller to generates preprogrammed sequences of firing signals to propagate coded messages by the high-energy broadband, acoustic signals.

Abstract: An airborne remote piloted vehicle does not require onboard fuel to greatly extend its endurance and payload capability. Photovoltaic cells are provided on substantially the entire bottom surface of the RPV to receive high intensity radiation beamed up from a ground station. The photovoltaic cells can be made responsive to visible light, infrared light and/or ultraviolet light emitted from lasers that direct narrow, high energy beams, or other directable narrow beams of other wavelengths of high energy radiation, including but not limited to microwaves. The cells convert the beamed up radiation to power at least one electrical motor driven propeller and instrumentation for onboard components including sensors, lasers, radio transmitters, and associated instrumentations. Control signals may also be beamed up or otherwise transmitted to the vehicle to control its transport to and hovering at an on-station location and to activate the onboard components for reconnaissance, monitoring, and relaying data.

Abstract: A method transforms non-speech input signals into the temporal, spectral and redundancy patterns resembling that of human speech.

Abstract: A sand spike system anchors a cable in an earthen substrate. A penetrator connected to the cable has folded petal-shaped sections of spring steel propelled into the earth by a propellant. Cables connected to opposite petal-shaped sections help arrest penetration and spread the folded petal-shaped sections outwardly to increase the resistance to tensile loads. Sand spike system may use a delay activated or an electrically initiated propellant to drive the penetrator into the earth instead of mechanical, hydraulic, or pneumatic force. This permits remote initiation of sand spikes from a safe distance on land or underwater. In addition, each sand spike creates far a greater surface area to entrain and use the earthen substrate and not friction to anchor, and, as a consequence, it safely bears greater tensile loads on the cable.

Abstract: An active magnetic anomaly sensing system includes a transmitter for transmitting a magnetic field towards a target. The magnetic field induces magnetic moments in the target which cause a magnetic anomaly field to propagate from the target. A first sensor positioned a distance D from the target directly senses magnetic field strength and produces a first output. A second sensor positioned a distance (D+d) from the target directly senses magnetic field strength and produces a second output. A controllable power supply is coupled to the transmitter for selectively activating and deactivating the transmitter. The first and second outputs are produced when the transmitter is deactivated. The second output is subtracted from the first output to generate a differential output indicative of the magnetic anomaly field propagating from the target.

Abstract: A small target weapon (STW) delivers a warhead to a remote target and detonates it in response to remote command signals from a swimmer delivery vehicle (SDV) and internal control signals generated by a self-contained internal electronics section. When deployed from the SDV, STW is capable of traveling several nautical miles underwater. The STW contains a warhead section and has a spool of optical fiber disposed aft to deploy optical fiber from the housing as it transits through water from a submerged delivery vehicle. Motor-driven propellers disposed aft on the housing of the STW propel it the through the water, and a mast member extends above the housing. Control fins disposed aft on the housing, a vertical thruster and the motor driven propellers are controlled by electronics sections and guidance and control sections to selectively keep the housing beneath the surface of the water and the mast member extending through the surface.

Abstract: A mine neutralization device (MND) is deployed from launch platform, such as an aircraft or surface craft, and travels several miles underwater to destroy a mine. Optical and/or acoustic command signals are coupled to the MND through an optical fiber and ambient water to control the MND on its way to the mine. The MND has a visible light system to illuminate the region around the MND, a camera system to provide optical data signals, and a sonar system to provide acoustic data signals transmitted to the launch platform. The optical and acoustic data signals are representative of images of features in the region to permit control signals from the platform to navigate the MND along the marine topography until the mine is located and identified. Once the mine is located and identified, explosives aboard the MND are detonated to destroy the mine.

Abstract: A noise suppressing microphone employing a thin film of piezoelectric material sandwiched between two conductive layers, one of which is laminated to a flat inflexible laminate. The sandwich is embedded in a mechanical sound filter except for one exposed face which is placed in contact with a user's body for sound pickup.

Abstract: A system and method are provided for supplying breathable gas to an underwater habitat submerged in water. A flow of respired gas that includes metabolically-produced carbon dioxide is extracted from the underwater habitat and mixed with water from the surrounding environment. As a result of such mixing, carbon dioxide in the respired gas is substantially absorbed by the water while a first gas is produced. Moisture in the first gas is filtered out to produce a breathable gas which is then introduced back into the underwater habitat.

Abstract: A system for arresting a fleeing seagoing vessel deploys a net using one or more self-propelled vehicles from a platform. The net is flown over and draped onto a seagoing vessel of interest such that a portion of the net's periphery resides in the water. Drag devices are coupled to the net to generate drag forces at the portion of the net's periphery in the water as the seagoing vessel moves through the water. The system can also include a variety of non-lethal weapon systems that are coupled to or incorporated with the net, and designed to subdue the crew of the vessel and/or the vessel's engine and electronic components.