发明名称 |
Flat model software compensated crystal oscillator for GPS receiver |
摘要 |
A GPS receiver comprises a crystal oscillator with a manufacturer's characteristic curve, a GPS radio, a TCO temperature sensor, and a GPS receiver software. The crystal oscillator serves as a local reference oscillator for the GPS radio. The GPS receiver software instructs the GPS radio to search radio spectrum for GPS satellite transmissions. Once the combination locks onto a minimum number of GPS satellites and produces a user position fix, the precise crystal oscillator frequency can be measured and associated with a temperature reading from the TCO to software-compensate the local oscillator in later cold-start frequency searches. A "flat" SCXO model is piecemeal upgraded with individual calibrations as they are collected over the life of the GPS receiver. During manufacturing of the GPS receiver such flat-SCXO model begins as a device characteristic curve supplied by the crystal manufacturer.
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申请公布号 |
US7253767(B1) |
申请公布日期 |
2007.08.07 |
申请号 |
US20050217693 |
申请日期 |
2005.09.01 |
申请人 |
JUNKAR MARTIN;BERGERENGEN JOHAN |
发明人 |
JUNKAR MARTIN;BERGERENGEN JOHAN |
分类号 |
G01S1/00;G01S19/23;G01S19/37;H03L1/00 |
主分类号 |
G01S1/00 |
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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