Patents by Inventor Rakesh Nayak

Rakesh Nayak 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).

  • Asymmetry technique for multipath mitigation in pseudorandom noise ranging receiver
    Patent number: 7876807
    Abstract: This invention is directed to a method for estimating and compensating for multipath errors in a pseudorandom noise ranging receiver. The method exploits the asymmetry of the correlation function and proportionately relates it to the magnitude of multipath error. In a pseudorandom noise ranging receiver, the correlation function is obtained by generating the local pseudorandom noise sequences at different programmed non-uniform phases resulting in non-uniformly spaced correlators. Numerically controlled oscillators, code generators and shift registers are programmed to determine the correlation values at non-uniformly distributed points on a correlation function. Curve fitting is undertaken to determine the code phase at which the correlation function peaks. A proportionality constant is applied to the measure of asymmetry of the correlation function to determine the multipath error in the pseudorandom noise signal. A filter is used to detect and eliminate outliers.
    Type: Grant
    Filed: July 5, 2004
    Date of Patent: January 25, 2011
    Assignee: Accord Software & Systems Pvt. Ltd.
    Inventors: Jayanta Kumar Ray, Rakesh Nayak
  • Asymmetry Technique for Multipath Mitigation in Pseudorandom Noise Ranging Receiver
    Publication number: 20070274375
    Abstract: This invention is directed to a method for estimating and compensating for multipath errors in a pseudorandom noise ranging receiver. The method exploits the asymmetry of the correlation function and proportionately relates it to the magnitude of multipath error. In a pseudorandom noise ranging receiver, the correlation function is obtained by generating the local pseudorandom noise sequences at different programmed non-uniform phases resulting in non-uniformly spaced correlators. Numerically controlled oscillators, code generators and shift registers are programmed to determine the correlation values at non-uniformly distributed points on a correlation function. Curve fitting is undertaken to determine the code phase at which the correlation function peaks. A proportionality constant is applied to the measure of asymmetry of the correlation function to determine the multipath error in the pseudorandom noise signal. A filter is used to detect and eliminate outliers.
    Type: Application
    Filed: July 5, 2004
    Publication date: November 29, 2007
    Applicant: Accord Software & Systems Pvt. Ltd.
    Inventors: Jayanta Ray, Rakesh Nayak