Patents by Inventor Joel L. Ekstrom

Joel L. Ekstrom 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).

  • Cancellation system for transmitter interference with nearby receiver
    Patent number: 4660042
    Abstract: Interference from frequency modulated transmitter signals, such as radar jamming signals, is cancelled in a nearby receiver by orthogonally related cancellation signals derived from the transmitter signal. The cancellation signals are controlled or modulated by corresponding cancellation modulation signals derived from the transmitter frequency modulation signal superposed on weighting signals. The employment of the transmitter frequency modulation signal as part of the cancellation modulation signals reduces cancellation error resulting from differences in frequency dependent delay shift in different transmission paths for the interfering signal and the cancellation signal.
    Type: Grant
    Filed: February 24, 1984
    Date of Patent: April 21, 1987
    Assignee: Litton Systems, Inc.
    Inventor: Joel L. Ekstrom