发明名称 |
GPS receiver and terminal device having search frequency band switching function |
摘要 |
A terminal device has a GPS receiver which receives GPS signals from a GPS satellite. The terminal device has an operation unit for instructing operation modes of the GPS receiver, and the GPS receiver has a clock unit, a radio frequency unit and a data extraction unit. The data extraction unit extracts GPS data by scanning signal-to-noise ratios of each frequency over a search frequency band. When a band correction mode is instructed by the operation unit, the data extraction unit switches its search frequency band from a first frequency band determined based on a maximum temperature-dependent change in the frequency of a clock signal to a second frequency band determined based on a maximum aging-dependent change in the frequency of the clock signal.
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申请公布号 |
US6384774(B1) |
申请公布日期 |
2002.05.07 |
申请号 |
US20000723620 |
申请日期 |
2000.11.27 |
申请人 |
DENSO CORPORATION;NTT DOCOMO, INC. |
发明人 |
MUTOH KATSUHIKO;YAMAMORI OSAMU;ISOGIMI KATSUMI |
分类号 |
G01C21/00;G01S1/00;G01S1/04;G01S19/23;H03J1/00;(IPC1-7):G01S7/19 |
主分类号 |
G01C21/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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