Patents by Inventor Billy D. Pettijohn

Billy D. Pettijohn 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).

  • Patent number: 9860085
    Abstract: A Least Mean Squares (LMS) polynomial estimator is disclosed. The LMS polynomial estimator may be a LMS moving window polynomial estimator capable of performing real-time polynomial estimation and evaluation of successive time derivatives of a function of a single variable up to a specified polynomial order. The estimator makes a unique use system memory that allows for the evaluation of the least squares normal equations with a very low computational footprint. This allows the estimator to be realizable in computationally-constrained environments such as embedded systems. The LMS polynomial estimator may be implemented in a frequency estimator for estimation of the phase, frequency, Doppler, delta Doppler, and/or higher order time derivatives of phase. Estimates may be performed in real time, running at the same rate as the inbound signal.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: January 2, 2018
    Assignee: Lockheed Martin Corporation
    Inventors: Billy D. Pettijohn, Erik Jan Paulley, MacDaniel J. Radigan
  • Patent number: 8880758
    Abstract: A non-transitory computer-readable medium, method, and system for processing a first data stream being in a first format from a link, the first data stream having a plurality of frames, each frame having a fixed frame length; selecting a plurality of sections of the first data stream based on a harmonic pattern of the first format, each selected section being separated from a neighboring selected section by a fixed separation length that is a whole number multiple of the fixed frame length; and creating a second data stream in a second format that includes a contiguous sequence of the selected sections. The second data stream can be further processed to acquire frame alignment with a reduction of required processing power.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: November 4, 2014
    Assignee: Lockheed Martin Corporation
    Inventor: Billy D. Pettijohn
  • Publication number: 20140164652
    Abstract: A non-transitory computer-readable medium, method, and system for processing a first data stream being in a first format from a link, the first data stream having a plurality of frames, each frame having a fixed frame length; selecting a plurality of sections of the first data stream based on a harmonic pattern of the first format, each selected section being separated from a neighboring selected section by a fixed separation length that is a whole number multiple of the fixed frame length; and creating a second data stream in a second format that includes a contiguous sequence of the selected sections. The second data stream can be further processed to acquire frame alignment with a reduction of required processing power.
    Type: Application
    Filed: December 7, 2012
    Publication date: June 12, 2014
    Applicant: LOCKHEED MARTIN CORPORATION
    Inventor: Billy D. PETTIJOHN
  • Patent number: 6892343
    Abstract: Disclosed is a system and method for joint source-channel encoding, symbol decoding and error correction, preferably utilizing an arithmetic encoder with operational error detection space; and a combination sequential, and arithmetic, encoded symbol decoder structure.
    Type: Grant
    Filed: March 24, 2001
    Date of Patent: May 10, 2005
    Assignee: Board of Regents of the University of Nebraska
    Inventors: Khalid Sayood, Michael W. Hoffman, Billy D. Pettijohn
  • Publication number: 20020016945
    Abstract: Disclosed is a system and method for joint source-channel encoding, symbol decoding and error correction, preferably utilizing an arithmetic encoder with operational error detection space; and a combination sequential, and arithmetic, encoded symbol decoder means.
    Type: Application
    Filed: March 24, 2001
    Publication date: February 7, 2002
    Inventors: Khalid Sayood, Michael W. Hoffman, Billy D. Pettijohn
  • Patent number: RE43231
    Abstract: Disclosed is a A system and method for joint source-channel encoding, symbol decoding and error correction, preferably utilizing an arithmetic encoder with operational error detection space; and a combination sequential, and arithmetic, encoded symbol decoder structure.
    Type: Grant
    Filed: May 10, 2007
    Date of Patent: March 6, 2012
    Assignee: Board of Regents of the University of Nebraska
    Inventors: Khalid Sayood, Michael W. Hoffman, Billy D. Pettijohn