The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1995
Filed:
Aug. 17, 1993
Koichi Washizu, Mitaka, JP;
Toshihiro Kawazoe, Mitaka, JP;
Yorihisa Suwa, Mitaka, JP;
Yukio Yokoi, Mitaka, JP;
Chogo Sekine, Mitaka, JP;
Tomio Yasuda, Kariya, JP;
Toshimitsu Oka, Okazaki, JP;
Yuichi Murakami, Chiryu, JP;
Tomohiro Yamamoto, Anjo, JP;
Seiji Ishikawa, Kariya, JP;
Japan Radio Co., Ltd., Tokyo, JP;
Aisin Seiki Kabushiki Kaisha, Tokyo, JP;
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.