Patents by Inventor John Y. Liu
John Y. Liu 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).
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Patent number: 10061008Abstract: A system and methods for calculating an attitude and a position of an object in space are disclosed. Measurements in relation to an object, stars, and a signal timing are received at a combined orbit and attitude determination system to provide received measurements. An estimated separation angle error, an estimated position error, and an estimated attitude error are estimated based upon the received measurements to provide estimated errors.Type: GrantFiled: June 8, 2015Date of Patent: August 28, 2018Assignee: The Boeing CompanyInventor: John Y. Liu
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Patent number: 9709399Abstract: Provided herein is a Coriolis vibratory gyroscope (“CVG”). The CVG includes a first plurality of actuators electrically coupled to the vibratory member and arranged about a drive axis of the CVG and operable to obtain a control signal from the controller and provide a voltage sufficient to cause and maintain the vibratory member to vibrate in a first mode of oscillation; a second plurality of actuators electrically coupled to the vibratory member and arranged about a sense axis of the CVG and operable to detect a voltage based on a second mode of oscillation of the vibratory member caused by a rotation of the CVG about an axis of rotation and to provide a counter-balancing signal sufficient to null the voltage based on the second mode of oscillation, wherein the controller is operable to determine a rate of the rotation of the CVG based, in part, on the counter-balancing signal.Type: GrantFiled: January 12, 2015Date of Patent: July 18, 2017Assignee: THE BOEING COMPANYInventor: John Y. Liu
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Patent number: 9534897Abstract: Provided herein is a method for determining a bias-compensated inertial rotation rate of a Coriolis vibratory gyroscope (“CVG”). The method comprises determining an initial mode that the CVG is operating; obtaining average uncompensated inertial rotation rate measurements from a previous mode transition period; obtaining average uncompensated bias measurements from the previous mode transition period; determining a first transition between a AGC mode and a FTR mode of a given axis; calculating a first estimate of bias of the CVG based on the first transition that was determined and the average uncompensated bias measurements from the previous mode transition period; and calculating, by a processor, a first bias-compensated inertial rotation rate of the CVG based on the first bias that was calculated and the average uncompensated inertial rotation rate measurements from a previous mode transition period.Type: GrantFiled: January 12, 2015Date of Patent: January 3, 2017Assignee: THE BOEING COMPANYInventor: John Y. Liu
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Publication number: 20160202059Abstract: Provided herein is a Coriolis vibratory gyroscope (“CVG”). The CVG includes a first plurality of actuators electrically coupled to the vibratory member and arranged about a drive axis of the CVG and operable to obtain a control signal from the controller and provide a voltage sufficient to cause and maintain the vibratory member to vibrate in a first mode of oscillation; a second plurality of actuators electrically coupled to the vibratory member and arranged about a sense axis of the CVG and operable to detect a voltage based on a second mode of oscillation of the vibratory member caused by a rotation of the CVG about an axis of rotation and to provide a counter-balancing signal sufficient to null the voltage based on the second mode of oscillation, wherein the controller is operable to determine a rate of the rotation of the CVG based, in part, on the counter-balancing signal.Type: ApplicationFiled: January 12, 2015Publication date: July 14, 2016Inventor: John Y. Liu
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Publication number: 20160202060Abstract: Provided herein is a method for determining a bias-compensated inertial rotation rate of a Coriolis vibratory gyroscope (“CVG”). The method comprises determining an initial mode that the CVG is operating; obtaining average uncompensated inertial rotation rate measurements from a previous mode transition period; obtaining average uncompensated bias measurements from the previous mode transition period; determining a first transition between a AGC mode and a FTR mode of a given axis; calculating a first estimate of bias of the CVG based on the first transition that was determined and the average uncompensated bias measurements from the previous mode transition period; and calculating, by a processor, a first bias-compensated inertial rotation rate of the CVG based on the first bias that was calculated and the average uncompensated inertial rotation rate measurements from a previous mode transition period.Type: ApplicationFiled: January 12, 2015Publication date: July 14, 2016Inventor: John Y. Liu
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Publication number: 20160047878Abstract: A system and methods for calculating an attitude and a position of an object in space are disclosed. Measurements in relation to an object, stars, and a signal timing are received at a combined orbit and attitude determination system to provide received measurements. An estimated separation angle error, an estimated position error, and an estimated attitude error are estimated based upon the received measurements to provide estimated errors.Type: ApplicationFiled: June 8, 2015Publication date: February 18, 2016Inventor: John Y. Liu
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Patent number: 9091552Abstract: A system and methods for calculating an attitude and a position of an object in space are disclosed. Measurements in relation to an object, stars, and a signal timing are received at a combined orbit and attitude determination system to provide received measurements. An estimated separation angle error, an estimated position error, and an estimated attitude error are estimated based upon the received measurements to provide estimated errors.Type: GrantFiled: October 25, 2011Date of Patent: July 28, 2015Assignee: THE BOEING COMPANYInventor: John Y. Liu
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Publication number: 20130103343Abstract: A system and methods for calculating an attitude and a position of an object in space are disclosed. Measurements in relation to an object, stars, and a signal timing are received at a combined orbit and attitude determination system to provide received measurements. An estimated separation angle error, an estimated position error, and an estimated attitude error are estimated based upon the received measurements to provide estimated errors.Type: ApplicationFiled: October 25, 2011Publication date: April 25, 2013Inventor: John Y. Liu
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Patent number: 7823836Abstract: A method and apparatus for maneuvering a satellite in orbit to alternately optimize the collection of solar energy and to take sensor data of terrestrial objects is disclosed The longitudinal axis of a large payload package is oriented perpendicular to the orbital plane to minimize the disturbance torque due to gravity gradient, and to allow simple rotation about the axis for attitude change between optimal Sun and optimal ground coverage.Type: GrantFiled: December 4, 2006Date of Patent: November 2, 2010Assignee: The Boeing CompanyInventors: Yiu-Hung M. Ho, John Y. Liu
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Patent number: 7787134Abstract: Systems and techniques for laser metrology. Two or more fanned probe beams are scanned relative to a surface including one or more targets. A position detection module receives return beam information from the fanned probe beams, and determines a position of at least a first target of the one or more targets based on the return beam information.Type: GrantFiled: April 19, 2006Date of Patent: August 31, 2010Assignee: The Boeing CompanyInventors: Kirk Kohnen, Peter J. Sedivec, Douglas Bender, Gregory S. Becker, John Y. Liu, Richard W. Guthrie, Ketao Liu, Ray McVey, Mark A. Lundgren
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Patent number: 7450251Abstract: Systems and techniques for laser metrology. A system may include a laser source and a fanning apparatus configured to generate a fanned laser beam. The fanned laser beam may be scanned across the surface of an object, and may reflect off a plurality of targets positioned on the surface. A position detection module may determine a position of the metrology targets based on the reflected beam.Type: GrantFiled: November 9, 2005Date of Patent: November 11, 2008Assignee: The Boeing CompanyInventors: Ketao Liu, Peter J. Sedivec, Douglas Bender, Gregory S. Becker, John Y. Liu, Richard W. Guthrie, Mark A. Lundgren
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Publication number: 20080128559Abstract: A method and apparatus for maneuvering a satellite in orbit to alternately optimize the collection of solar energy and to take sensor data of terrestrial objects is disclosed The longitudinal axis of a large payload package is oriented perpendicular to the orbital plane to minimize the disturbance torque due to gravity gradient, and to allow simple rotation about the axis for attitude change between optimal Sun and optimal ground coverage.Type: ApplicationFiled: December 4, 2006Publication date: June 5, 2008Inventors: Yiu-Hung M. Ho, John Y. Liu
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Patent number: 6820947Abstract: Method and device for controlling the braking action of at least one wheel brake of a four-wheel-drive motor vehicle having at least one rear axle and one front axle. A first rpm signal representing the speeds of rotation of the front-axle wheels and a second rpm signal representing the speeds of rotation of the rear-axle wheels are detected. The difference between the first and second rpm signals is then determined, and braking action is controlled as a function of the difference that has been determined.Type: GrantFiled: December 29, 1999Date of Patent: November 23, 2004Assignee: Robert Bosch GmbHInventors: Carlos Atoche-Juarez, John Gatza, Michael Lindemann, John Y. Liu
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Patent number: 6458732Abstract: A dry refractory composition having superior insulating value. The dry refractory composition also may have excellent resistance to molten metals and slags. The composition includes filler lightweight material, which may be selected from perlite, vermiculite, expanded shale, expanded fireclay, expanded alumina silica hollow spheres, bubble alumina, sintered porous alumina, alumina spinel insulating aggregate, calcium alumina insulating aggregate, expanded mulllite, cordierite, and anorthite, and matrix material, which may be selected from calcined alumina, fused alumina, sintered magnesia, fused magnesia, silica fume, fused silica, silicon carbide, boron carbide, titanium diboride, zirconium boride, boron nitride, aluminum nitride, silicon nitride, Sialon, titanium oxide, barium sulfate, zircon, a sillimanite group mineral, pyrophyllite, fireclay, carbon, and calcium fluoride.Type: GrantFiled: June 7, 1999Date of Patent: October 1, 2002Assignee: Allied Mineral Products, Inc.Inventors: Douglas K. Doza, John Y. Liu
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Publication number: 20020057014Abstract: Method and device for controlling the braking action of at least one wheel brake of a four-wheel-drive motor vehicle having at least one rear axle and one front axle. A first rpm signal representing the speeds of rotation of the front-axle wheels and a second rpm signal representing the speeds of rotation of the rear-axle wheels are detected. The difference between the first and second rpm signals is then determined, and braking action is controlled as a function of the difference that has been determined.Type: ApplicationFiled: December 29, 1999Publication date: May 16, 2002Applicant: KENYON & KENYONInventors: CARLOS ATOCHE-JUAREZ, JOHN GATZA, MICHAEL LINDEMANN, JOHN Y. LIU
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Patent number: 5344800Abstract: Improved gunnable plastic refractory compositions consist of a mass of friable clusters of granular material which has a moisture content of from about 4% to about 10% by weight of the total composition and contains from about 0.05% to about 0.5% by weight (added), preferably 0.1% to 0.3%, of a hydrocolloid selected from the class consisting of a polysaccharide ether and xanthan gum and from about 0.05% to about 1.0% by weight (added), preferably 0.15% to about 0.50%, carbon.Type: GrantFiled: June 10, 1993Date of Patent: September 6, 1994Assignee: A.P. Green Industries, Inc.Inventors: Cheryl L. Jackson, John Y. Liu