Patents by Inventor Clifford W. Kelley

Clifford W. Kelley 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: 20170004400
    Abstract: A coherent process for the acquiring and tracking of time varying signals includes receiving a time varying signal, sampling the received time varying signal, processing received data samples of the time varying signal using a global optimization method and processing received data samples of the time varying signal using a local optimization method.
    Type: Application
    Filed: December 22, 2014
    Publication date: January 5, 2017
    Inventors: Jeffrey Frericks, Clifford W. Kelley
  • Patent number: 8676501
    Abstract: An improved approach to satellite-based navigation (e.g., GPS) is provided. In one embodiment, a method includes receiving a first set of tracking information. A nominal orbital path for the navigation satellite is determined using the first set of tracking information. Ephemeris data corresponding to the nominal orbital path is computed and uploaded to the navigation satellite. Long-term navigation information corresponding to the nominal orbital path is transmitted to a communication system for broadcast to a plurality of navigation devices. A second set of tracking information is received, an orbital path of the navigation satellite using the second set of tracking information is predicted, and a difference between the predicted orbital path and the nominal orbital path is determined. Commands configured to instruct the navigation satellite to adjust an actual orbital path of the navigation satellite to substantially conform to the nominal orbital path are uploaded to the navigation satellite.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: March 18, 2014
    Assignee: The Boeing Company
    Inventors: Jonathan A. Tekawy, Raymond S. DiEsposti, Clifford W. Kelley
  • Patent number: 8259012
    Abstract: A system that provides GPS-based navigation/orbit determination capabilities for high-altitude spacecraft. The system uses an existing spacecraft processor and an easy-to-space-qualify minimum-hardware front end to minimize the need for new space-qualified hardware. The system also uses coherent integration to acquire and track the very weak GPS signals at high altitudes. The system also uses diurnal thermal modeling of a spacecraft clock and precision orbit propagation to enable longer coherent integration, a special Kalman filter to allow weak signal tracking by integrated operation of orbit determination and GPS signal tracking, and a segment-by-segment, post-processing, delayed-time approach to allow a low-speed spacecraft processor to provide the software GPS capability.
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: September 4, 2012
    Assignee: The Boeing Company
    Inventors: Rongsheng Li, Kamran Ghassemi, Clifford W. Kelley
  • Patent number: 8099186
    Abstract: An improved approach to satellite-based navigation (e.g., GPS) is provided. In one embodiment, a method includes determining a nominal orbital path of a navigation satellite. The method also includes transmitting ephemeris data corresponding to the nominal orbital path from the navigation satellite to a plurality of navigation devices. The method further includes determining an actual orbital path of the navigation satellite locally at the navigation satellite. In addition, the method includes determining a deviation between the actual orbital path and the nominal orbital path locally at the navigation satellite. The method also includes autonomously adjusting the actual orbital path locally at the navigation satellite to reduce the deviation between the actual orbital path and the nominal orbital path.
    Type: Grant
    Filed: May 1, 2007
    Date of Patent: January 17, 2012
    Assignee: The Boeing Company
    Inventors: Jonathan A. Tekawy, Raymond S. DiEsposti, Clifford W. Kelley, Jya-Syin W. Chien
  • Publication number: 20110254734
    Abstract: A system that provides GPS-based navigation/orbit determination capabilities for high-altitude spacecraft. The system uses an existing spacecraft processor and an easy-to-space-qualify minimum-hardware front end to minimize the need for new space-qualified hardware. The system also uses coherent integration to acquire and track the very weak GPS signals at high altitudes. The system also uses diurnal thermal modeling of a spacecraft clock and precision orbit propagation to enable longer coherent integration, a special Kalman filter to allow weak signal tracking by integrated operation of orbit determination and GPS signal tracking, and a segment-by-segment, post-processing, delayed-time approach to allow a low-speed spacecraft processor to provide the software GPS capability.
    Type: Application
    Filed: April 14, 2010
    Publication date: October 20, 2011
    Applicant: THE BOEING COMPANY
    Inventors: Rongsheng Li, Kamran Ghassemi, Clifford W. Kelley
  • Patent number: 7667642
    Abstract: A system and method autonomously and precisely track objects moving along a known course. The objects include, for example, racing horses, other racing animals, or racing vehicles. The system and method utilize modern satellite navigation satellite systems, signal processing, radio communications systems and computer processing to acquire and analyze performance data of the moving objects during competitions and during training and practice. The data acquisition is performed continuously at a rate of at least 1 Hz during the competition, training or practice even in the presence of objects which affect the quality of the signals received from the satellite system.
    Type: Grant
    Filed: August 13, 2006
    Date of Patent: February 23, 2010
    Assignee: Technaumics
    Inventors: Jeff E. Frericks, Clifford W. Kelley
  • Patent number: 7492314
    Abstract: User equipment navigation solution with position determination of a navigation signal reflector methods and systems are described. In an embodiment, navigation signals transmitted from global positioning system (GPS) platform(s) can be received at a GPS-enabled receiver as direct navigation signals and reflected navigation signals. The direct navigation signals can then be isolated from the reflected navigation signals. Receiver range measurements can be determined from the direct navigation signals which are received via direct signal paths from the GPS platform(s), and a navigation solution of the GPS-enabled receiver can then be resolved from the receiver range measurements. Similarly, reflector range measurements can be determined from the reflected navigation signals which are received via reflected signal paths from a signal reflector, and a position of the signal reflector can then be resolved from the reflector range measurements at the GPS-enabled receiver.
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: February 17, 2009
    Assignee: The Boeing Company
    Inventors: Raymond S. DiEsposti, Jonathan A. Tekawy, Clifford W. Kelley
  • Publication number: 20080177430
    Abstract: An improved approach to satellite-based navigation (e.g., GPS) is provided. In one embodiment, a method includes determining a nominal orbital path of a navigation satellite. The method also includes transmitting ephemeris data corresponding to the nominal orbital path from the navigation satellite to a plurality of navigation devices. The method further includes determining an actual orbital path of the navigation satellite locally at the navigation satellite. In addition, the method includes determining a deviation between the actual orbital path and the nominal orbital path locally at the navigation satellite. The method also includes autonomously adjusting the actual orbital path locally at the navigation satellite to reduce the deviation between the actual orbital path and the nominal orbital path.
    Type: Application
    Filed: May 1, 2007
    Publication date: July 24, 2008
    Inventors: Jonathan A. Tekawy, Raymond S. DiEsposti, Clifford W. Kelley, Jya-Syin W. Chien
  • Publication number: 20080154502
    Abstract: An improved approach to satellite-based navigation (e.g., GPS) is provided. In one embodiment, a method includes receiving a first set of tracking information. A nominal orbital path for the navigation satellite is determined using the first set of tracking information. Ephemeris data corresponding to the nominal orbital path is computed and uploaded to the navigation satellite. Long-term navigation information corresponding to the nominal orbital path is transmitted to a communication system for broadcast to a plurality of navigation devices. A second set of tracking information is received, an orbital path of the navigation satellite using the second set of tracking information is predicted, and a difference between the predicted orbital path and the nominal orbital path is determined. Commands configured to instruct the navigation satellite to adjust an actual orbital path of the navigation satellite to substantially conform to the nominal orbital path are uploaded to the navigation satellite.
    Type: Application
    Filed: December 22, 2006
    Publication date: June 26, 2008
    Inventors: Jonathan A. Tekawy, Raymond S. DiEsposti, Clifford W. Kelley
  • Publication number: 20080129587
    Abstract: User equipment navigation solution with position determination of a navigation signal reflector methods and systems are described. In an embodiment, navigation signals transmitted from global positioning system (GPS) platform(s) can be received at a GPS-enabled receiver as direct navigation signals and reflected navigation signals. The direct navigation signals can then be isolated from the reflected navigation signals. Receiver range measurements can be determined from the direct navigation signals which are received via direct signal paths from the GPS platform(s), and a navigation solution of the GPS-enabled receiver can then be resolved from the receiver range measurements. Similarly, reflector range measurements can be determined from the reflected navigation signals which are received via reflected signal paths from a signal reflector, and a position of the signal reflector can then be resolved from the reflector range measurements at the GPS-enabled receiver.
    Type: Application
    Filed: December 1, 2006
    Publication date: June 5, 2008
    Applicant: The Boeing Company
    Inventors: Raymond S. DiEsposti, Jonathan A. Tekawy, Clifford W. Kelley
  • Patent number: 5355241
    Abstract: An IFF device comprises a beam generator for directing an unmodulated beam at a target. The target has a plurality of retro-reflectors mounted on it. These retro-reflectors have internal reflecting surfaces for reflecting the unmodulated beam penetrating the retro-reflector. A device is associated with the internal reflecting surfaces for modulating the beam at a predetermined frequency so that the reflected beam emerging from the retro-reflector is modulated at the same frequency. A tuner is positioned in the path of the reflected modulated beam and tuned to predetermined frequency, so that if the tuner receives a signal, it indicates the target is friendly.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: October 11, 1994
    Inventor: Clifford W. Kelley
  • Patent number: 5168152
    Abstract: A guidance system for of vehicle, such as a model airplane which has directional control devices. A device is mounted on the vehicle or at some remote station to generate a command attitude signal. At least two sensors are mounted on the body of the vehicle and face in opposite directions away from the body of the vehicle. These sensors are connected together in such a way that radiation falling on the sensors causes the sensors to produce a signal such that the signal at the junction between the sensor is functionally related to the orientation of the vehicle. A servo mechanism is mounted on the body of the vehicle and is connected to the directional control devices of the vehicle. An electric circuit is connected between the signal from the sensors and the device that generates a command attitude signal and the servo mechanism.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: December 1, 1992
    Inventor: Clifford W. Kelley