Patents by Inventor Yorihisa Suwa

Yorihisa Suwa 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).

  • Signal receiver for global positioning system
    Patent number: 5402441
    Abstract: A GPS signal receiver has a PN code generator for producing a PN code identical to a PN code in a received GPS signal which is transmitted from a GPS satellite, the PN code produced by the PN code generator being controllable in phase, a PN code correlator for correlating the received GPS signal with the PN code produced by the PN code generator so as to code-strip the received GPS signal, a signal search unit for monitoring a correlated output signal from the PN code correlator and controlling the phase of the PN code produced by the PN code generator to search for a correlated output signal in excess of a predetermined value, a signal determining unit for determining the correlated output signal in excess of the predetermined value as being produced by a direct wave of the GPS signal, and a signal tracking unit for controlling the phase of the PN code produced by the PN code generator to track a peak of the correlated output signal that is determined as being produced by the direct wave of the GPS signal.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: March 28, 1995
    Assignees: Japan Radio Co., Ltd., Aisin Seiki Kabushiki Kaisha
    Inventors: Koichi Washizu, Toshihiro Kawazoe, Yorihisa Suwa, Yukio Yokoi, Chogo Sekine, Tomio Yasuda, Toshimitsu Oka, Yuichi Murakami, Tomohiro Yamamoto, Seiji Ishikawa