Patents by Inventor Rongsheng Li

Rongsheng Li 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).

  • Publication number: 20100059631
    Abstract: A method of controlling attitude of a spacecraft during a transfer orbit operation is provided. The method includes providing a slow spin rate, determining the attitude of the spacecraft using a unified sensor set, and controlling the attitude of the spacecraft using a unified control law. The use of a unified set of sensors and a unified control law reduces spacecraft complexity, cost, and weight.
    Type: Application
    Filed: November 3, 2009
    Publication date: March 11, 2010
    Applicant: THE BOEING COMPANY
    Inventors: H. Grant Wang, Rongsheng Li
  • Patent number: 7665695
    Abstract: A method of controlling attitude of a spacecraft during a transfer orbit operation is provided. The method includes providing a slow spin rate, determining the attitude of the spacecraft using a unified sensor set, and controlling the attitude of the spacecraft using a unified control law. The use of a unified set of sensors and a unified control law reduces spacecraft complexity, cost, and weight.
    Type: Grant
    Filed: August 9, 2005
    Date of Patent: February 23, 2010
    Assignee: The Boeing Company
    Inventors: H. Grant Wang, Rongsheng Li
  • Patent number: 7546983
    Abstract: A system for, and method of recovering a solar-powered spacecraft from an anomaly that renders the attitude of the spacecraft unknown includes maintaining a power-safe attitude by switching between two orthogonal axes using solar panel current sensors. The system and method may also include simultaneously determining spacecraft attitude using a star sensor. The system is applicable to spacecraft operating in a solar wing-stowed configuration.
    Type: Grant
    Filed: August 9, 2005
    Date of Patent: June 16, 2009
    Assignee: The Boeing Company
    Inventors: H. Grant Wang, Rongsheng Li
  • Patent number: 7487016
    Abstract: A method for controlling an actuator of a vehicle comprises providing a dynamic condition sensor generating a vehicle movement signal and a position sensor for generating a reported position. A processor is coupled to the inertial sensor and the position sensor and comprises an estimator, a position measurement predictor having a filter, a comparator and a control shaping block, said estimator generating a vehicle position based upon the dynamic condition sensor, said position measurement predictor generating an estimated position measurement in response to the reported vehicle position and a matched frequency response to the movement signal, said control shaping block generating an actuator control signal in response to a comparison of the estimated position measurement and the reported vehicle position.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: February 3, 2009
    Assignee: The Boeing Company
    Inventors: Richard A. Fowell, Rongsheng Li, Yeong-Wei A. Wu
  • Publication number: 20080046138
    Abstract: A method for controlling an actuator of a vehicle comprises providing a dynamic condition sensor generating a vehicle movement signal and a position sensor for generating a reported position. A processor is coupled to the inertial sensor and the position sensor and comprises an estimator, a position measurement predictor having a filter, a comparator and a control shaping block, said estimator generating a vehicle position based upon the dynamic condition sensor, said position measurement predictor generating an estimated position measurement in response to the reported vehicle position and a matched frequency response to the movement signal, said control shaping block generating an actuator control signal in response to a comparison of the estimated position measurement and the reported vehicle position.
    Type: Application
    Filed: September 7, 2005
    Publication date: February 21, 2008
    Inventors: Richard Fowell, Rongsheng Li, Yeong-Wei Wu
  • Patent number: 7310578
    Abstract: A system (18) includes: a) A vehicle (12) includes an attitude or angular velocity control system (38), a plurality of star trackers or star sensors (22) each having a field of view (28); b) a memory (30) having a star catalog (32), a star pair catalog (58) and a reference table (56) stored therein; and c) a processor (24) coupled to the attitude or angular velocity control system (38), the star trackers or star sensors (22), and the memory (30). The processor (24) determines the vehicle inertial attitude or angular velocity or sensor alignment, based, in part, on the star pair catalog (58) and reference table (56). The design of the star pair catalog (58) and reference table (56) is suitable for rapid determination of attitude or angular velocity or sensor alignment, and an efficient use of memory.
    Type: Grant
    Filed: June 24, 2004
    Date of Patent: December 18, 2007
    Assignee: The Boeing Company
    Inventors: James P. Alstad, David D. Needelman, Rongsheng Li, Richard A. Fowell, Peter C. Lai, Yeong-Wei A. Wu
  • Patent number: 7228231
    Abstract: A vehicle (12) including a control system (18) is used for controlling vehicle attitude or angular velocity (38). The processor (24) is coupled to a star sensor or tracker (22) and a memory (30) that may include a star catalog (32), and an exclusion list (36). The exclusion list (36), a list of stars to be temporarily excluded from consideration when determining attitude or angular velocity or relative alignment of star sensors or trackers, is calculated on board. Such a calculation prevents the necessity for a costly, periodic, ground calculation and upload of such data. By manipulating the star catalog, or sub-catalogs derived from said catalog, based upon the exclusion list (36), measurements of such excluded stars are prevented from corrupting the attitude or angular velocity or alignment estimates formulated on board. The system uses multiple stayout zones for excluding stars from the exclusion list.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: June 5, 2007
    Assignee: The Boeing Company
    Inventors: David D. Needelman, Richard A. Fowell, Peter C. Lai, Yeong-Wei A. Wu, Rongsheng Li
  • Patent number: 7219014
    Abstract: A vehicle (12) including a control system (18) is used for controlling vehicle attitude or angular velocity (38). The processor (24) is coupled to a star sensor or tracker (22) and a memory (30) that may include a star catalog (32), and an exclusion list (36). The exclusion list (36), a list of stars to be temporarily excluded from consideration when determining attitude or angular velocity or relative alignment of star sensors or trackers, is calculated on-board. Such a calculation prevents the necessity for a costly, periodic, ground calculation and upload of such data. By manipulating the star catalog, or sub-catalogs derived from said catalog, based upon the exclusion list (36), measurements of such excluded stars are prevented from corrupting the attitude or angular velocity or alignment estimates formulated on board.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: May 15, 2007
    Assignee: The Boeing Company
    Inventors: David D. Needelman, Rongsheng Li, Richard A. Fowell, Peter C. Lai, Yeong-Wei A. Wu, Bruce N. Eyerly, Jonathan French
  • Publication number: 20070023579
    Abstract: A method of controlling attitude of a spacecraft during a transfer orbit operation is provided. The method includes providing a slow spin rate, determining the attitude of the spacecraft using a unified sensor set, and controlling the attitude of the spacecraft using a unified control law. The use of a unified set of sensors and a unified control law reduces spacecraft complexity, cost, and weight.
    Type: Application
    Filed: August 9, 2005
    Publication date: February 1, 2007
    Applicant: THE BOEING COMPANY
    Inventors: H. Wang, Rongsheng Li
  • Patent number: 7149610
    Abstract: A method and apparatus for estimating spacecraft momentum is disclosed. The method comprises the steps of generating a plurality of spacecraft momentum measurements, fitting the plurality of spacecraft momentum measurements to a parametric model of a spacecraft momentum profile having a time period of tp, determining the momentum of the spacecraft from the parametric model; and generating an estimate of the momentum to be removed from the spacecraft at least in part from the determined momentum of the spacecraft.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: December 12, 2006
    Assignee: The Boeing Company
    Inventors: Hanching G. Wang, Rongsheng Li
  • Patent number: 7136752
    Abstract: A system (18) includes: a) A vehicle (12) includes an attitude or angular velocity control system (38), a plurality of star trackers or star sensors (22) each having a field of view (28); b) a memory (30) having a star catalog (32), an allocated area for a star pair catalog (58) and a reference table (56) stored therein; and c) a processor (24) coupled to the attitude or angular velocity control system (38), the star trackers or star sensors (22), and the memory (30). The processor (24) populates the star pair catalog (58), using the method described herein. The processor (24) then periodically determines the vehicle inertial attitude or angular velocity or sensor alignment, based, in part, on the star pair catalog (58) and reference table (56). The novel ability of the software to autonomously populate the star pair catalog (58) allows users to avoid uploading a large amount of data, and the problems associated with such an upload.
    Type: Grant
    Filed: June 24, 2004
    Date of Patent: November 14, 2006
    Assignee: The Boeing Company
    Inventors: David D. Needelman, Rongsheng Li, Richard A. Fowell, Peter C. Lai, Yeong-Wei A. Wu
  • Patent number: 7124001
    Abstract: A method and apparatus for estimating a slave payload attitude is disclosed. The method includes accepting a plurality of slave payload attitude measurements, deriving a model of the relative attitude of the slave payload and a master payload attitude at least in part from the plurality of slave attitude measurements, predicting the relative attitude between the slave payload attitude and the master payload attitude using the derived model, and estimating the relative attitude between the slave payload attitude and the master payload attitude at least in part from the predicted relative attitude between the slave payload attitude and the master payload attitude. Furthermore, the absolute attitude of the slave payload is computed using the relative attitude and the master payload attitude.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: October 17, 2006
    Assignee: The Boeing Company
    Inventors: Rongsheng Li, Hanching Grant Wang, Yeong-Wei A. Wu
  • Publication number: 20060186274
    Abstract: A system for, and method of recovering a solar-powered spacecraft from an anomaly that renders the attitude of the spacecraft unknown includes maintaining a power-safe attitude by switching between two orthogonal axes using solar panel current sensors. The system and method may also include simultaneously determining spacecraft attitude using a star sensor. The system is applicable to spacecraft operating in a solar wing-stowed configuration.
    Type: Application
    Filed: August 9, 2005
    Publication date: August 24, 2006
    Applicant: THE BOEING COMPANY
    Inventors: H. Wang, Rongsheng Li
  • Publication number: 20060149474
    Abstract: A method of estimating the alignment of a star sensor (20) for a vehicle (12) includes generating star tracker data. A vehicle attitude and a star sensor attitude are determined in response to the star tracker data. A current alignment sample is generated in response to the vehicle attitude and the star sensor attitude. A current refined estimate alignment signal is generated in response to the current alignment sample and a previously refined estimate alignment signal via a vehicle on-board filter (38).
    Type: Application
    Filed: January 3, 2005
    Publication date: July 6, 2006
    Inventors: David Needelman, Rongsheng Li, Yeong-Wei Wu
  • Patent number: 7062363
    Abstract: A method and apparatus for refining a spacecraft state estimate, such as an attitude estimate or an angular velocity estimate, is disclosed. The method computes a plurality equations using residuals describing the difference between observed star positions and predicted positions based on inertial measurements, and solves those equations to generate refined estimates of the spacecraft state estimates.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: June 13, 2006
    Assignee: The Boeing Company
    Inventors: David D. Needelman, Rongsheng Li, Yeong-Wei A. Wu
  • Publication number: 20050246073
    Abstract: A vehicle (12) including a control system (18) is used for controlling vehicle attitude or angular velocity (38). The processor (24) is coupled to a star sensor or tracker (22) and a memory (30) that may include a star catalog (32), and an exclusion list (36). The exclusion list (36), a list of stars to be temporarily excluded from consideration when determining attitude or angular velocity or relative alignment of star sensors or trackers, is calculated on board. Such a calculation prevents the necessity for a costly, periodic, ground calculation and upload of such data. By manipulating the star catalog, or sub-catalogs derived from said catalog, based upon the exclusion list (36), measurements of such excluded stars are prevented from corrupting the attitude or angular velocity or alignment estimates formulated on board. The system uses multiple stayout zones for excluding stars from the exclusion list.
    Type: Application
    Filed: April 29, 2004
    Publication date: November 3, 2005
    Applicant: THE BOEING COMPANY
    Inventors: David Needelman, Richard Fowell, Peter Lai, Yeong-Wei Wu, Rongsheng Li
  • Publication number: 20050246072
    Abstract: A vehicle (12) including a control system (18) is used for controlling vehicle attitude or angular velocity (38). The processor (24) is coupled to a star sensor or tracker (22) and a memory (30) that may include a star catalog (32), and an exclusion list (36). The exclusion list (36), a list of stars to be temporarily excluded from consideration when determining attitude or angular velocity or relative alignment of star sensors or trackers, is calculated on-board. Such a calculation prevents the necessity for a costly, periodic, ground calculation and upload of such data. By manipulating the star catalog, or sub-catalogs derived from said catalog, based upon the exclusion list (36), measurements of such excluded stars are prevented from corrupting the attitude or angular velocity or alignment estimates formulated on board.
    Type: Application
    Filed: April 29, 2004
    Publication date: November 3, 2005
    Applicant: THE BOEING COMPANY
    Inventors: David Needelman, Rongsheng Li, Richard Fowell, Peter Lai, Yeong-Wei Wu, Bruce Eyerly, Jonathan French
  • Publication number: 20050154529
    Abstract: A system (18) includes: a) A vehicle (12) includes an attitude or angular velocity control system (38), a plurality of star trackers or star sensors (22) each having a field of view (28); b) a memory (30) having a star catalog (32), an allocated area for a star pair catalog (58) and a reference table (56) stored therein; and c) a processor (24) coupled to the attitude or angular velocity control system (38), the star trackers or star sensors (22), and the memory (30). The processor (24) populates the star pair catalog (58), using the method described herein. The processor (24) then periodically determines the vehicle inertial attitude or angular velocity or sensor alignment, based, in part, on the star pair catalog (58) and reference table (56). The novel ability of the software to autonomously populate the star pair catalog (58) allows users to avoid uploading a large amount of data, and the problems associated with such an upload.
    Type: Application
    Filed: June 24, 2004
    Publication date: July 14, 2005
    Applicant: THE BOEING COMPANY
    Inventors: David Needelman, Rongsheng Li, Richard Fowell, Peter Lai, Yeong-Wei Wu
  • Publication number: 20050154528
    Abstract: A system (18) includes: a) A vehicle (12) includes an attitude or angular velocity control system (38), a plurality of star trackers or star sensors (22) each having a field of view (28); b) a memory (30) having a star catalog (32), a star pair catalog (58) and a reference table (56) stored therein; and c) a processor (24) coupled to the attitude or angular velocity control system (38), the star trackers or star sensors (22), and the memory (30). The processor (24) determines the vehicle inertial attitude or angular velocity or sensor alignment, based, in part, on the star pair catalog (58) and reference table (56). The design of the star pair catalog (58) and reference table (56) is suitable for rapid determination of attitude or angular velocity or sensor alignment, and an efficient use of memory.
    Type: Application
    Filed: June 24, 2004
    Publication date: July 14, 2005
    Applicant: THE BOEING COMPANY
    Inventors: James Alstad, David Needelman, Rongsheng Li, Richard Fowell, Peter Lai, Yeong-Wei Wu
  • Publication number: 20050133670
    Abstract: Systems and method of attitude determination and control for spacecraft include the use of a unified set of sensors for all phases of space flight. For example, the same set of sensors may be used for on-station operations and transfer orbit operations. The use of a unified set of sensors reduces complexity, spacecraft cost, and spacecraft weight.
    Type: Application
    Filed: December 3, 2003
    Publication date: June 23, 2005
    Inventors: H. Wang, Rongsheng Li