Yong Hua Liu

US Patent:

6356815, Mar 12, 2002

Filed:

Aug 25, 2000

Appl. No.:

09/648501

Inventors:

Rongsheng Li - Hacienda Heights CA
Yong Liu - San Marino CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

G01C 2102

US Classification:

701 13, 701222, 701226, 244164, 244171

Abstract:

Stellar attitude-control systems and methods are provided with enhanced accuracy because they recognize that important star tracker errors exhibit a boresight symmetry and that these errors can be accurately defined by weighting a measurement-noise covariance matrix R(t ) with variances that are functions of off-boresight angles of detected stars. A method of the invention derives off-boresight angles from star-tracker signals of detected stars. These off-boresight angles are combined with variance coefficients to generate off-boresight variances r (t ) that are functions of the off-boresight angles and, in particular, correspond to star tracker color shift errors. A gain matrix K(t ) is then calculated with a weighted measurement-noise covariance matrix R(t ) that includes the off-boresight variances r (t ). This gain matrix is used to generate an attitude estimate matrix X*(t ) for use in spacecraft attitude control. The variance coefficients are preferably modified to include star tracker focal length shift errors which are also a function of off-boresight angles.

US Patent:

6362464, Mar 26, 2002

Filed:

Feb 15, 2000

Appl. No.:

09/504543

Inventors:

Yong Liu - San Marino CA
Rongsheng Li - Hacienda Heights CA
Christopher L. Rice - Lawndale CA

Assignee:

Hughes Electronics Corp. - El Segundo CA

International Classification:

G01C 2102

US Classification:

2502061, 2502036, 244171

Abstract:

An apparatus for determining stellar inertial attitude based upon a plurality of stars includes a star tracker and a controller. The star tracker is used to sense the positions of stars and generate signals corresponding to the positions of the stars as seen in its field of view. The controller checks a star catalog and actively determines which stars to track. The controller does this determination in terms of each stars relative geometry. The controller then commands the star tracker to track these stars and uses them to determine the spacecraft attitude.

US Patent:

7724188, May 25, 2010

Filed:

May 23, 2008

Appl. No.:

12/126134

Inventors:

Yong Liu - San Marino CA, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

H01Q 3/00

US Classification:

342359

Abstract:

Gimbal system angle compensation methods and systems are provided. A particular method includes pointing an antenna at a first target using an initial set of at least four gimbal angles and determining first bore sight pointing errors resulting from a pointing direction of the antenna relative to the first target. The method also includes estimating values of a plurality of independently observable error variables based on the first bore sight pointing errors. The method further includes determining a set of gimbal angle corrections based on the values of the plurality of independently observable error variables.

US Patent:

8211747, Jul 3, 2012

Filed:

Dec 13, 2011

Appl. No.:

13/323979

Inventors:

Dan Kinzer - El Segundo CA, US
Yong Liu - Scarborough ME, US
Stephen Martin - South Portland ME, US

Assignee:

Fairchild Semiconductor Corporation - San Jose CA

International Classification:

H01L 21/00

US Classification:

438108, 257401, 257500, 257724, 257774, 257E23169, 257E2706

Abstract:

This document discusses, among other things, apparatus and methods for an IC package including first and a second discrete components fabricated into a semiconductor substrate. The first and second discrete components can be adjacent to one another in the semiconductor substrate, and an integrated circuit die can be mounted on the semiconductor substrate and coupled to the first and second discrete components.

US Patent:

8332181, Dec 11, 2012

Filed:

Dec 9, 2009

Appl. No.:

12/634529

Inventors:

Yong Liu - San Marino CA, US
A. Dorian Challoner - Manhattan Beach CA, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

G01C 9/00
G01C 17/38
G06F 19/00

US Classification:

702150, 345156, 367 96, 382103, 439135, 702 95

Abstract:

The present disclosure provides a small size hand-held device for aligning two or more structures by attaching the device to master and slave structures and providing real-time position/orientation data to enable the accurate alignment of the structures. The handheld device includes a sensor box containing at least one inertial sensor, such as for example, a gyroscope (such as a disc resonator gyroscope) or an accelerometer. The handheld device further includes an alignment socket designed to mate with an alignment key that may be fixed to the structures to be aligned, and a display for showing a position data output received from the at least one inertial sensor. The handheld device may further include a processor for processing and outputting data to the display and/or the handheld device may include a transmitter for transmitting the data to a central processing unit.

US Patent:

20120060837, Mar 15, 2012

Filed:

Sep 10, 2010

Appl. No.:

12/880022

Inventors:

Yong LIU - Yorba Linda CA, US

International Classification:

A61M 16/00

US Classification:

12820421

Abstract:

A ventilator including an inspiration flow control unit and an expiration flow control unit coupled to the inspiration flow control unit. The ventilator also includes a nasal intermittent mandatory ventilation (NIMV) control system coupled to the inspiration flow control unit and the expiration flow control unit. The NIMV control system is configured to automatically and simultaneously adjust an inspiration flow and an expiration flow. A pressure of the inspiration flow is increased from a baseline pressure to a control pressure. A pressure of the expiration flow is returned to the baseline pressure.

US Patent:

20130042868, Feb 21, 2013

Filed:

Aug 17, 2011

Appl. No.:

13/212157

Inventors:

Yong Liu - Yorba Linda CA, US

International Classification:

A61M 16/00

US Classification:

12820421

Abstract:

A high frequency oscillation ventilator including an oscillating piston control system and a mean airway pressure control system. The oscillating piston control system and the mean airway pressure control system are closed-loop control systems. The oscillating piston control system is independent of the mean airway pressure control system.

US Patent:

20130179105, Jul 11, 2013

Filed:

Jan 11, 2012

Appl. No.:

13/348263

Inventors:

Yong Liu - San Marino CA, US
Anthony Dorian Challoner - Manhattan Beach CA, US

Assignee:

THE BOEING COMPANY - Chicago IL

International Classification:

G06F 19/00

US Classification:

702 87

Abstract:

A method for compensating for bias of a gyroscope. In one embodiment, bias measurements for a plurality of drive angles are generated using the gyroscope. A set of equations for the bias of the gyroscope is identified using a model for motion of the gyroscope. The set of equations includes a set of parameters for the bias of the gyroscope. A set of values for the set of parameters is identified using the bias measurements and the set of equations.