Patents Assigned to Cartesian Devices
  • Position tracking system
    Patent number: 5163004
    Abstract: The present invention is an improved position tracking system utilizing at least three cw transmitting stations generally symmetrically disposed about an area of interest, and also including a mobile receiving station receiving the transmitted signals, converting the received signals to a common frequency, and comparing the phase difference between the converted signals to produce and output signal indicating the location of the mobile station relative to any desired point or points in the area of interest.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: November 10, 1992
    Assignee: Cartesian Devices
    Inventor: Mark L. Rentz