Patents by Inventor Douglas N. Travers

Douglas N. Travers has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Sky wave direction finder
    Patent number: 5032844
    Abstract: A system using two magnetic quadrupole antennas, two magnetic dipole antennas and means for processing the respective antenna signal outputs provides unambiguous estimates of elevation and polarization for an incident RF signal. The system uses an efficient procedure to process the signals from a small aperture array of fixed loop elements for the purpose of providing radio direction of arrival information that is free of intrinsic polarization error. The directional information is developed by performing a simultaneous arctangent operation on signals output from the antennas or as the measured phase difference between a quadrature summed quadrupole output and a quadrature summed dipole output compensated by a phase offset between the dipole antennas and the quadrupole antennas.
    Type: Grant
    Filed: March 21, 1989
    Date of Patent: July 16, 1991
    Assignee: Southwest Research Institute
    Inventors: Jackie E. Hipp, Douglas N. Travers
  • Phase linear interferometer system and method
    Patent number: 4387376
    Abstract: A radio interferometer system and method for obtaining more accurate readings from a radio source by processing the received signal as a plane wave and establishing coincidence locations and conditions, and discarding readings which are noncoincidence within a selected tolerance.
    Type: Grant
    Filed: November 17, 1980
    Date of Patent: June 7, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: William M. Sherrill, Douglas N. Travers, Paul E. Martin
  • Sky wave DF antenna system
    Patent number: 4207572
    Abstract: A sky wave DF antenna system is disclosed. It is able to respond to an incoming transmitted signal and define the direction of the transmitter. It utilizes six or more simple loops connected and arranged to form a spaced loop antenna system which indicates the incoming direction of the transmitted signal without regard to the polarization or the elevational angle of the sky wave.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: June 10, 1980
    Assignee: Southwest Research Institute
    Inventors: Jackie E. Hipp, Douglas N. Travers, Terence C. Green, William M. Sherrill, Richard L. Johnson
  • Teletype mixer apparatus for coding and decoding
    Patent number: 4192967
    Abstract: Apparatus for terminating teletype signal lines and mixing cryptographic teletype signals to furnish an enciphered teletype signal including a secondary operating mode of the mixer unit to retransmit the incoming teletype signal in the event enciphering or deciphering is not required.
    Type: Grant
    Filed: May 26, 1966
    Date of Patent: March 11, 1980
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Martin J. Prucha, Willis L. Donaldson, Douglas N. Travers
  • Quadrupole adcock direction finder and antenna therefor
    Patent number: 3939477
    Abstract: A plurality of dipoles is arranged and connected to form a quadrupole Adcock Antenna system which is connected with direction finding circuitry to define a direction finder system of which two embodiments are disclosed. The system responds to any transmitter to be located.
    Type: Grant
    Filed: April 6, 1973
    Date of Patent: February 17, 1976
    Assignee: Southwest Research Institute
    Inventors: Terence C. Green, William G. Guion, Douglas N. Travers, William M. Sherrill