Patents by Inventor YOUNGMIN ALBERT CHOI

YOUNGMIN ALBERT CHOI 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).

  • Patent number: 10648811
    Abstract: One embodiment includes a gyroscope system. The system includes a sensor system comprising a vibrating-mass and electrodes each arranged to provide one of a driving force and a force-rebalance to the vibrating-mass in each of three orthogonal axes. The system also includes a gyroscope controller that generates a drive signal provided to a first electrode of the electrodes to provide the driving force to facilitate an in-plane periodic oscillatory motion of the vibrating-mass along a first axis of the three orthogonal axes. The gyroscope controller also generates a force-rebalance signal provided to each of a second electrode and a third electrode of the plurality of electrodes associated with a respective second axis and a respective third axis of the three orthogonal axes to calculate a rotation of the gyroscope system about the respective second axis and the respective third axis of the three orthogonal axes.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: May 12, 2020
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: Alexander A. Trusov, Youngmin Albert Choi, David Dexter Lynch
  • Publication number: 20190170514
    Abstract: One embodiment includes a gyroscope system. The system includes a sensor system comprising a vibrating-mass and electrodes each arranged to provide one of a driving force and a force-rebalance to the vibrating-mass in each of three orthogonal axes. The system also includes a gyroscope controller that generates a drive signal provided to a first electrode of the electrodes to provide the driving force to facilitate an in-plane periodic oscillatory motion of the vibrating-mass along a first axis of the three orthogonal axes. The gyroscope controller also generates a force-rebalance signal provided to each of a second electrode and a third electrode of the plurality of electrodes associated with a respective second axis and a respective third axis of the three orthogonal axes to calculate a rotation of the gyroscope system about the respective second axis and the respective third axis of the three orthogonal axes.
    Type: Application
    Filed: December 1, 2017
    Publication date: June 6, 2019
    Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: ALEXANDER A. TRUSOV, YOUNGMIN ALBERT CHOI, DAVID DEXTER LYNCH
  • Patent number: 10119820
    Abstract: A gyroscope sensor is provided that comprises a resonator including a stem extending along an axis and a shell extending from the stem. The shell includes a hemispherical portion extending from the stem and a cylindrical portion extending from the hemispherical portion. The cylindrical portion includes an outer surface and an inner surface and terminates at an axial end surface that is perpendicular to the outer surface and the inner surface. The resonator further comprises an inner cylindrical substrate that extends along an axis and includes a set of inner electrodes arranged annularly about the axis, and a passage that extends along the axis through a central region of the inner cylindrical substrate. The stem extends through the passage to position the inner cylindrical substrate within the inner surface of the cylindrical portion of the resonator forming gaps between the set of inner electrodes and the inner surface.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: November 6, 2018
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: David M. Rozelle, Youngmin Albert Choi, James M. Pavell
  • Publication number: 20160231113
    Abstract: A gyroscope sensor is provided that comprises a resonator including a stem extending along an axis and a shell extending from the stem. The shell includes a hemispherical portion extending from the stem and a cylindrical portion extending from the hemispherical portion. The cylindrical portion includes an outer surface and an inner surface and terminates at an axial end surface that is perpendicular to the outer surface and the inner surface. The resonator further comprises an inner cylindrical substrate that extends along an axis and includes a set of inner electrodes arranged annularly about the axis, and a passage that extends along the axis through a central region of the inner cylindrical substrate. The stem extends through the passage to position the inner cylindrical substrate within the inner surface of the cylindrical portion of the resonator forming gaps between the set of inner electrodes and the inner surface.
    Type: Application
    Filed: February 10, 2015
    Publication date: August 11, 2016
    Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: DAVID M. ROZELLE, YOUNGMIN ALBERT CHOI, JAMES M. PAVELL