Patents by Inventor Michael E. Glidewell

Michael E. Glidewell 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).

  • Correcting frequency errors in frequency difference of arrival geolocation systems
    Patent number: 9797987
    Abstract: A frequency correction for frequency difference of arrival geolocation of transmitted target signals may be provided. A frequency of a target signal may be determined at a first collector based upon a first reference timebase source. A frequency of the target signal may be determined at a second collector based upon a second reference timebase source. An observed frequency of a reference carrier signal based upon the first reference timebase source may be determined at the second collector based upon the second reference timebase source. A relative timebase error between the first collector and the second collector may be calculated based upon a difference between the intended frequency of the reference carrier signal and the observed frequency of the reference carrier signal. A corrected frequency difference for the target signal may be calculated based upon the relative timebase error and a proportional scaling factor.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: October 24, 2017
    Assignee: Zeta Associates, Inc.
    Inventors: John M. Holford, James M. Williams, Michael E. Glidewell
  • CORRECTING FREQUENCY ERRORS IN FREQUENCY DIFFERENCE OF ARRIVAL GEOLOCATION SYSTEMS
    Publication number: 20140104108
    Abstract: A frequency correction for frequency difference of arrival geolocation of transmitted target signals may be provided. A frequency of a target signal may be determined at a first collector based upon a first reference timebase source. A frequency of the target signal may be determined at a second collector based upon a second reference timebase source. An observed frequency of a reference carrier signal based upon the first reference timebase source may be determined at the second collector based upon the second reference timebase source. A relative timebase error between the first collector and the second collector may be calculated based upon a difference between the intended frequency of the reference carrier signal and the observed frequency of the reference carrier signal. A corrected frequency difference for the target signal may be calculated based upon the relative timebase error and a proportional scaling factor.
    Type: Application
    Filed: October 15, 2013
    Publication date: April 17, 2014
    Applicant: Zeta Associates, Inc.
    Inventors: John M. Holford, James M. Williams, Michael E. Glidewell