Patents by Inventor Jih-Fang A. Liu

Jih-Fang A. Liu 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: 9857454
    Abstract: A range-gated Doppler radar configured to mitigate the effects of pulsed interference. A Doppler filter is constructed using a vector of weights, the vector of weights being calculated as the matrix product of (i) the inverse of an reduced overall covariance matrix and (ii) a reduced progressive phasor vector. The reduced overall covariance matrix is formed by deleting from an overall covariance matrix rows and columns corresponding to pulses corrupted by pulsed interference. The reduced progressive phasor vector is formed by deleting from a progressive phasor vector elements corresponding to pulses corrupted by pulsed interference. The elements of the progressive phasor vector have constant modulus and the phase of the elements changes linearly within the vector. The overall covariance matrix is a weighted sum of an identity matrix and several specific covariance matrices, that may represent distributed clutter with positive velocity, distributed clutter with negative velocity, and ground clutter.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: January 2, 2018
    Assignee: Raytheon Command And Control Solutions LLC
    Inventors: Sien-Chang C. Liu, Jih-Fang A. Liu