Gte Internetworking Incorporated

Laitram, LLC

Bolt Beranek and Newman Inc.

Douglas C Gilbert

James Edwin Barger

Gregory L Duckworth

John T Fowler

Peter G Cable

A low cost and highly accurate sniper detection and localization system uses observations of the shock wave from supersonic bullets to estimate the bullet trajectory, Mach number, and caliber. If available, muzzle blast observations from an unsilenced firearm is used to estimate the exact sniper location along the trajectory. The system may be fixed or portable and may be wearable on a user's body. The system utilizes a distributed array of acoustic sensors to detect the projectile's shock wave and the muzzle blast from a firearm. The detection of the shock wave and muzzle blast is used to measure the wave arrival times of each waveform type at the sensors. This time of arrival (TOA) information for the shock wave and blast wave are used to determine the projectile's trajectory and a line of bearing to the origin of the projectile. A very accurate model of the bullet ballistics and acoustic radiation is used which includes bullet deceleration. This allows the use of very flexible acoustic sensor types and placements, since the system can model the bullet's flight, and hence the acoustic observations, over a wide area very accurately. System sensor configurations can be as simple as two small three element tetrahedral microphone arrays on either side of the area to be protected or six omnidirectional microphones spread over the area to be monitored. Sensors may also be monitored to a helmet as used with the wearable system. Sensor nodes provide information to a command node via wireless network telemetry or hardwired cables for the command node comprising a computer to effect processing and display.

Acoustic counter-sniper system

A low cost and highly accurate sniper detection and localization system uses observations of the shock wave from supersonic bullets to estimate the bullet trajectory, Mach number, and caliber. If available, muzzle blast observations from an unsilenced firearm is used to estimate the exact sniper location along the trajectory. The system utilizes a distributed array of acoustic sensors to detect the leading edge of a projectile's shock wave and the muzzle blast from a firearm. The detection of the shock wave and muzzle blast is used to measure the wave arrival times of each waveform type at the sensors. This time of arrival (TOA) information for the shock wave and blast wave are used to determine the projectile's trajectory and a line of bearing to the origin of the projectile. A very accurate model of the bullet ballistics and acoustic radiation is used which includes bullet deceleration. This allows the use of very flexible acoustic sensor types and placements, since the system can model the bullet's flight, and hence the acoustic observations, over a wide area very accurately. System sensor configurations can be as simple as two small three element tetrahedral microphone arrays on either side of the area to be protected, or six omnidirectional microphones spread over the area to be monitored. Sensor nodes provide information to a Command node via wireless network telemetry or hardwired cables for the Command Node comprising a computer to effect processing and display.

A method and apparatus for automated separation of fluid borne magnetically responsive spheres into different populations by carefully manipulating forces of gravity, buoyancy, fluid friction, and magnetism. Distinct homogeneous sphere populations are separated from a non-homogeneous population including a plurality of intermixed homogeneous sphere populations, without significant manual processing, by: effecting magnetic distancing of an initial non-homogeneous sphere population; facilitating enhanced separation of the non-homogeneous population in accordance with rate of descent of spheres within homogeneous populations; providing magnetic acceleration of the separation process; and effecting magnetic concentration of the separated homogeneous sphere populations. The process and apparatus provide for improved bio-sensing resulting from the automated condensing of homogeneous groups of spheres from a non-homogeneous sphere population.

Method and apparatus for separation of magnetically responsive spheres

A method and apparatus for providing a magnetic compass, and system to accurately calibrate the compass with a rotation of the vessel on which the compass is mounted through a single rotation of 360 degrees. The compass comprises gimballed field sensing elements, and processor to provide a signal which is corrected for compass offsets, for permanent magnetic field anomalies and for induced magnetic field anomalies.

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Ledyard, CT, United States of America

Douglas C Gilbert