Patents by Inventor Walter R. Fried

Walter R. Fried 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).

  • Accurate location system using transponded and correlated LORAN signals
    Patent number: 5181041
    Abstract: An accurate location system 10 for use in locating the position of a tracked unit 16 having at least a first and a second transmitter 14, 22 for propagating at least first and second signals and a master station 12 for receiving and storing the first and second signals, respectively. The tracked unit 16 receives and operates on the first and second signals from the first and second transmitters 14, 22, respectively, for providing third and fourth signals which are transponded to the master station 12. A correlation detector 40 located within the master station 12 receives and cross-correlates the transponded third and fourth signals with the stored first and second signals within the master station for determining the additional times of flight (.tau.) of the third and fourth signals transponded to the master station. The locus of points of constant (.tau.
    Type: Grant
    Filed: July 2, 1991
    Date of Patent: January 19, 1993
    Assignee: Hughes Aircraft Company
    Inventors: Harold V. Lind, Walter R. Fried, Jacob L. Bricker