System and method for frequency management in a communication device having a positioning device
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United States of America Patent
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May 25, 2004
Grant Date -
Apr 1, 2004
app pub date -
Sep 30, 2002
filing date -
Sep 30, 2002
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Abstract
A frequency management scheme for a hybrid cellular/GPS or other device generates a local clock signal for the communications portion of the device, using a crystal oscillator or other part. The oscillator output may be corrected by way of an automatic frequency control (AFC) circuit or software, to drive the frequency of that clock signal to a higher accuracy. Besides being delivered to the cellular or other communications portion of the hybrid device, the compensated clock signal may also be delivered to a comparator to measure the offset between the cellular oscillator and the GPS oscillator. The error in the cellular oscillator may be measured from the AFC operation in the cellular portion of the device. An undershoot or overshoot in the delta between the two oscillators may thus be deduced to be due to bias in the GPS oscillator, whose value may then be determined. That value may then be used to adjust Doppler search, bandwidth or other GPS receiver characteristics to achieve better time to first fix or other performance characteristics.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- GOOGLE TECHNOLOGY HOLDINGS LLC
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Goldberg, Mark A | Davie, FL | 50 | 620 |
Haverkamp, Kristi Annette | Mesa, AZ | 1 | 160 |
Korneluk, Jose | Boynton Beach, FL | 2 | 171 |
Meraj, Atif | Plantation, FL | 2 | 162 |
Patel, Anil | Boca Raton, FL | 35 | 448 |
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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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