Initial acquisition using crystal oscillator
First Claim
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1. A method, comprising:
- holding in a memory of a receiver, for multiple temperatures, (i) respective first parameters indicative of frequency errors of a crystal oscillator in the receiver at the respective temperatures, and (ii) respective second parameters that specify whether the corresponding first parameters were most-recently updated during successful operation of the receiver at the respective temperatures or only during initial characterization of the crystal oscillator;
measuring an operating temperature of the crystal oscillator;
selecting a center frequency based on one of the first parameters corresponding to the measured operating temperature;
selecting, based on one of the second parameters corresponding to the measured operating temperature, a size of a frequency uncertainty range around the center frequency, over which to attempt initial acquisition of signals from a transmitter; and
tuning the receiver to acquire the signals from the transmitter over the selected frequency uncertainty range around the center frequency.
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Abstract
A method includes holding in a memory of a receiver, for each temperature in a range of temperatures, a respective first parameter indicative of a frequency error of a crystal oscillator in the receiver at the temperature, and a respective second parameter indicative of an uncertainty of the first parameter. An operating temperature of the crystal oscillator is measured. One or more frequencies, for initial acquisition of signals from a transmitter, are selected based on the first and second parameters corresponding to the measured operating temperature. The receiver is tuned to receive the signals from the transmitter on at least one of the selected frequencies.
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Citations
20 Claims
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1. A method, comprising:
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holding in a memory of a receiver, for multiple temperatures, (i) respective first parameters indicative of frequency errors of a crystal oscillator in the receiver at the respective temperatures, and (ii) respective second parameters that specify whether the corresponding first parameters were most-recently updated during successful operation of the receiver at the respective temperatures or only during initial characterization of the crystal oscillator; measuring an operating temperature of the crystal oscillator; selecting a center frequency based on one of the first parameters corresponding to the measured operating temperature; selecting, based on one of the second parameters corresponding to the measured operating temperature, a size of a frequency uncertainty range around the center frequency, over which to attempt initial acquisition of signals from a transmitter; and tuning the receiver to acquire the signals from the transmitter over the selected frequency uncertainty range around the center frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus, comprising:
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a receiver, which is configured to receive signals; a memory, which is configured to hold, for multiple temperatures, (i) respective first parameters indicative of frequency errors of a crystal oscillator in the receiver at the respective temperatures, and (ii) respective second parameters that specify whether the corresponding first parameters were most-recently updated during successful operation of the receiver at the respective temperatures or only during initial characterization of the crystal oscillator; and control circuitry, which is configured to obtain a measured operating temperature of the crystal oscillator, to select a center frequency based on one of the first parameters corresponding to the measured operating temperature, to select, based on one of the second parameters corresponding to the measured operating temperature, a size of a frequency uncertainty range around the center frequency, over which to attempt initial acquisition of the signals from a transmitter, and to tune the receiver to acquire the signals from the transmitter over the selected frequency uncertainty range around the center frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification