Jay B. Chase - Alameda CA, US Philip A. Pincosy - Oakland CA, US Donna M. Chato - Tracy CA, US Hugh Kirbie - Los Alamos CA, US Glen F. James - Livermore CA, US
Assignee:
The Regents of the University of California - Oakland CA
International Classification:
F42D 1/02 F42D 1/045
US Classification:
102217, 1022027, 102218, 102206, 361248
Abstract:
The present invention is directed to a system having a plurality of capacitor discharge units (CDUs) that includes electrical bridge type detonators operatively coupled to respective explosives. A pulse charging circuit is adapted to provide a voltage for each respective capacitor in each CDU. Such capacitors are discharged through the electrical bridge type detonators upon receiving an optical signal to detonate respective operatively coupled explosives at substantially the same time.
The United States of America as represented by the Secretary of the Navy - Washington DC
International Classification:
H04B 1100
US Classification:
367134
Abstract:
An inertial measurement underwater tracking system which determines range sition onboard an underwater vehicle using inertial navigation techniques. The system uses acoustic telemetry to relay the range position from the vehicle to an operations site. The position data is also recorded onboard the vehicle for post-run analysis. An onboard computer receives the inertial measurements from an inertial measurement unit and computes vehicle position with respect to an initialized reference. An acoustic transmitter receives the measurements, formats the data and transmits it by acoustic telemetry. An underwater hydrophone receives the acoustic telemetry and inputs the data to an acoustic processor to reconstruct the original position data. A range computer processes in real-time the data, and displays and records the time history of vehicle location on the range. After recovery the onboard recorded data is played back into the range computer to provide a maximum accuracy, continuous vehicle-run history.
Tracking And Telemetry System For Severe Multipath Acoustic Channels
The United States of America as represented by the Secretary of the Navy - Washington DC
International Classification:
H04B 1100
US Classification:
367134
Abstract:
A modulation/signal processing technique for acoustic communication in show water. Digital information is transmitted in a time expended version of frequency shift keying where a tone burst at a first frequency represents a logical zero and a tone burst at a second frequency represents a logical one. There is a long quiet time between bits to allow multipath interference to decay. A relative energy detector with a fast attack/slow decay circuit for Doppler compensation is used to receive the transmitted tone bursts and reproduce a digital data train equivalent to the transmitted pulse train. A single communication channel employs two frequencies to transmit an identity code as a signal validating and identification method and two frequencies to simultaneously transmit telemetry data.