Patents Assigned to Electronic Tracking Systems, Inc.
  • Beacon signal receiving system
    Patent number: 5657026
    Abstract: A method and apparatus for locating and tracking a portable transmitter that may be deposited with currency or other items desired to be tracked, comprising a doppler antenna array, analog antenna switching, radio frequency and intermediate frequency circuitry and a digital signal processor, exhibiting increasing sensitivity, accuracy, and range.
    Type: Grant
    Filed: January 26, 1996
    Date of Patent: August 12, 1997
    Assignee: Electronic Tracking Systems, Inc.
    Inventors: Jerry W. Culpepper, John D. Markus, Lawrence M. Smith, Zhaoliang Chen