Method and apparatus for self-calibration and adaptive temperature compensation in GPS receivers
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United States of America Patent
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Dec 2, 2008
Grant Date -
Nov 30, 2006
app pub date -
May 26, 2005
filing date -
May 26, 2005
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Abstract
The invention provides a method and apparatus to optimally estimate and adaptively compensate the temperature-induced frequency drift of a crystal oscillator in a navigational signal receiver. A Read-Write memory encodes two tables, one for looking up frequency drift values versus temperature readings and another one for valid data confirmation on the first table. The initially empty look-up table is gradually populated with frequency drift values while the receiver computes the frequency drift along with its position. During initial start of the receiver or re-acquisition of satellite signals, the stored frequency drift value corresponding to the current temperature is used. If no valid frequency drift value is available, the frequency drift value is computed based on the existing frequency drift values in the table. This invention reduces the Time-To-First-Fix (TTFF) of the receiver and enables the receiver to self-calibrate, thus no additional factory calibration would be necessary.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- CSR TECHNOLOGY HOLDINGS INC.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Han, Shaowei | Palo Alto, CA | 19 | 366 |
Mo, Jun | San Jose, CA | 15 | 152 |
Shridhara, Kudrethaya A | Cupertino, CA | 2 | 35 |
Wang, Chi-Shin | Half Moon Bay, CA | 26 | 303 |
Wang, Hansheng | San Jose, CA | 55 | 354 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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