Patents by Inventor Tooru Yoshihara

Tooru Yoshihara 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).

  • Apparatus and method for positioning of a GPS receiver
    Patent number: 5248981
    Abstract: A GPS receiver and related method for positioning on the Globe. The GPS receiver receives satellite signals in a sequential manner with a plurality of antennas, whereby any of the plurality of antennas which receives satellite signals from the maximum number of GPS satellites is selected by an antenna switching unit under the control of a control unit, a combination of GPS satellites having the smallest PDOP value or the signal strength in due order is selected by the control unit from among all of GPS satellites in contact with respective antennas when each of the antennas fails to receive satellite signals transmitted by the predetermined minimum number of GPS satellites.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: September 28, 1993
    Assignee: Pioneer Electronic Corporation
    Inventors: Tooru Yoshihara, Masashi Shimakata, Toshiaki Tsuchiya, Shigeru Tsujimura