Patents by Inventor Lawrence Sheldon

Lawrence Sheldon 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).

  • Geolocation using time difference of arrival and long baseline interferometry
    Patent number: 10884095
    Abstract: Techniques are provided for geolocation of a radar emitting source. A methodology implementing the techniques according to an embodiment includes calculating time difference of arrival (TDOAs) of ground emitter radar pulses, within a dwell period, between two long baseline interferometer (LBI) antennas. The TDOA calculations are based on a precision estimate of the time of arrival of the radar pulses. The method further includes calculating an LBI phase wrap disambiguation factor based on (1) the TDOAs, (2) an average of frequencies of the radar pulses within the dwell period, and (3) an average of phase shifts of the radar pulses between the LBI antennas within the dwell period. The method further includes mapping a curve of points onto the surface of the earth based on an LBI cone angle calculation employing the LBI phase wrap disambiguation factor. The curve of points is associated with a geolocation of the ground emitter.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: January 5, 2021
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Richard Schiffmiller, Lawrence Sheldon
  • GEOLOCATION USING TIME DIFFERENCE OF ARRIVAL AND LONG BASELINE INTERFEROMETRY
    Publication number: 20200292655
    Abstract: Techniques are provided for geolocation of a radar emitting source. A methodology implementing the techniques according to an embodiment includes calculating time difference of arrival (TDOAs) of ground emitter radar pulses, within a dwell period, between two long baseline interferometer (LBI) antennas. The TDOA calculations are based on a precision estimate of the time of arrival of the radar pulses. The method further includes calculating an LBI phase wrap disambiguation factor based on (1) the TDOAs, (2) an average of frequencies of the radar pulses within the dwell period, and (3) an average of phase shifts of the radar pulses between the LBI antennas within the dwell period. The method further includes mapping a curve of points onto the surface of the earth based on an LBI cone angle calculation employing the LBI phase wrap disambiguation factor. The curve of points is associated with a geolocation of the ground emitter.
    Type: Application
    Filed: March 13, 2019
    Publication date: September 17, 2020
    Applicant: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Richard Schiffmiller, Lawrence Sheldon