Patents by Inventor Graham William Pulford

Graham William Pulford 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).

  • Navigation system integrity
    Patent number: 8629805
    Abstract: A method for modelling integrity of a filtered global navigation satellite system, by calculating component navigation system error distributions for a set of fault conditions and a fault free condition, and determining overall navigation error distribution by forming a mixture distribution from these component navigation system error distributions. The mixture distribution may be determined by weighted summation of navigation system error (NSE) distributions with weightings determined according to prior probabilities for the fault conditions. Once the overall NSE mixture distribution is determined in this way, it can be used to derive one or more statistical quantities relevant to the integrity of the navigation system such as the probability of exceeding given alert limits in a desired coordinate geometry.
    Type: Grant
    Filed: January 20, 2010
    Date of Patent: January 14, 2014
    Assignee: Qinetiq Limited
    Inventor: Graham William Pulford
  • NAVIGATION SYSTEM INTEGRITY
    Publication number: 20110291887
    Abstract: A method for modelling integrity of a filtered global navigation satellite system, by calculating component navigation system error distributions for a set of fault conditions and a fault free condition, and determining overall navigation error distribution by forming a mixture distribution from these component navigation system error distributions. The mixture distribution may be determined by weighted summation of navigation system error (NSE) distributions with weightings determined according to prior probabilities for the fault conditions. Once the overall NSE mixture distribution is determined in this way, it can be used to derive one or more statistical quantities relevant to the integrity of the navigation system such as the probability of exceeding given alert limits in a desired coordinate geometry.
    Type: Application
    Filed: January 20, 2010
    Publication date: December 1, 2011
    Applicant: QINETIQ LIMITED
    Inventor: Graham William Pulford
  • Tracking method for a radar system
    Patent number: 6243037
    Abstract: A tracking method for a signal echo system, including generating a plurality of gates for respective propagation modes on the basis of a target state prediction for a dwell time, and generating a target state estimate for the dwell time on the basis of target measurement points which fall within the gates.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: June 5, 2001
    Assignee: The Commonwealth of Australia
    Inventors: Graham William Pulford, Robert Keith Jarrott, Robin John Evans