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. 07, 2017
Filed:
Apr. 26, 2011
Hideyuki Torimoto, Tokyo, JP;
Makoto Ishii, Tokyo, JP;
Masahiro Asako, Tokyo, JP;
Hiroaki Maeda, Kanagawa, JP;
Hideyuki Torimoto, Tokyo, JP;
Makoto Ishii, Tokyo, JP;
Masahiro Asako, Tokyo, JP;
Hiroaki Maeda, Kanagawa, JP;
GNSS Technologies Inc., Tokyo, JP;
Lighthouse Technology & Consulting Co., Ltd., Kanagawa, JP;
Abstract
Provided is a navigation signal transmitter capable of ensuring reduction in frequency deviation of a terrestrially transmitted navigation signal at low cost. The navigation signal transmitter is operable to receive a transmission wave, generate a synchronization pulse in synchronization with a predetermined data frame, generate an internal clock fundamental oscillation by a reference signal synchronizing section () using the synchronization pulse as a reference signal, generate an IMES signal based on the internal clock fundamental oscillation, and transmit the IMES signal. The reference signal synchronizing section () comprises a counter circuit (), a comparator (), a low-pass control filter (), a D/A converter () and a voltage controlled oscillator (). The reference signal synchronizing section () is configured to, when a magnitude relationship between the number of clock pulses generated in the voltage controlled oscillator () using the synchronization pulse as the reference signal and a reference value falls within a predetermined value and continues a predetermined number of times in one direction, adjust a level of control voltage of the voltage controlled oscillator ().