Title:
測位方法
Document Type and Number:
Japanese Patent JP5361228
Kind Code:
B2
Abstract:
A navigation-satellite receiver comprises a real-time clock that can be slaved to the highly accurate time base of the GPS system. During such times, the amount of correction and the operating temperature are both tracked. It is. assumed the operating temperature will has the greatest influence of frequency errors later when the real-time clock cannot be slaved to the GPS time base. When the receiver is powered-down, the real time clock is nevertheless kept alive. Its free-running frequency is corrected for temperature. The next time the receiver is powered up, time accurate to better than one millisecond in a day can be obtained instantly for use in other receiver initialization procedures.
Inventors:
Paul Double McBurney
Application Number:
JP2008072149A
Publication Date:
December 04, 2013
Filing Date:
March 19, 2008
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
G01S19/23; G01S1/00; G01S19/25; H03L1/02; H03L7/00
Domestic Patent References:
| JP2001249174A | ||||
| JP11326487A | ||||
| JP11258326A | ||||
| JP2001059864A | ||||
| JP2001083228A | ||||
| JP7311290A |
Attorney, Agent or Firm:
Yasushi Kuroda
Takekoshi Noboru
Inoue Ichi
Takekoshi Noboru
Inoue Ichi
Previous Patent: JPS5361227
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