Patents by Inventor Patrick A. Hwang

Patrick A. Hwang 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).

  • Enhanced differential GNSS carrier-smoothed code processing using dual frequency measurements
    Patent number: 6198430
    Abstract: A method of generating a differentially corrected pseudorange residual in a differential global positioning system includes tracking at a base station first and second GPS signals, having first and second frequencies, from a first satellite. At the base station, a first pseudorange measurement is determined from the tracked first GPS signal. At the base station, a first smoothed pseudorange measurement is calculated from the determined first pseudorange measurement as a function of both the first and second GPS signals. The first smoothed pseudorange measurement is provided to a remote GPS receiver. The remote GPS receiver calculates the differentially corrected pseudorange residual as a function of the first smoothed pseudorange measurement provided by the base station.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: March 6, 2001
    Assignee: Rockwell Collins, Inc.
    Inventors: Patrick A. Hwang, Gary A. McGraw, John R. Bader