METHOD AND SYSTEM FOR FREQUENCY DRIFT PREDICTION
First Claim
1. A method of frequency drift prediction for use by a positioning receiver, comprising the steps of:
- determining a moving average of a frequency error in a communication device;
determining a moving average of a frequency drift rate of the communication device;
determining a frequency drift rate uncertainty in a communication device; and
providing the moving average of the frequency error, the moving average of the frequency drift rate, and the frequency drift rate uncertainty to the positioning receiver.
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Accused Products
Abstract
A method (200) of frequency drift prediction for use by a positioning receiver (106) can include the steps of determining (202) a moving average of a frequency error, determining (206) a moving average of a frequency drift rate in a communication device, determining (212) a frequency drift rate uncertainty, and providing (214) the moving average of frequency error and frequency drift rate, and the frequency drift rate uncertainty to the positioning receiver. A point-to-point slope from the running average of the instantaneous frequency error and a running average of the point-to-point slope for a predetermined time period can be determined (208 & 210). The frequency drift uncertainty or window is determined using information determined from the moving average of the frequency drift rate. The positioning receiver can be a global positioning receiver.
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Citations
18 Claims
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1. A method of frequency drift prediction for use by a positioning receiver, comprising the steps of:
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determining a moving average of a frequency error in a communication device;
determining a moving average of a frequency drift rate of the communication device;
determining a frequency drift rate uncertainty in a communication device; and
providing the moving average of the frequency error, the moving average of the frequency drift rate, and the frequency drift rate uncertainty to the positioning receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for generating a frequency reference in a hybrid communications device, comprising the steps of:
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generating a clock signal at a base frequency;
performing communications processing in a communications receiver based on an input of the clock signal at the base frequency;
generating frequency tracking data containing a moving average of a frequency error, frequency drift rate and a drift rate uncertainty of the communications receiver;
transmitting a control message to the positioning receiver to adapt positioning processing based on the frequency tracking data; and
performing positioning processing in a positioning receiver based on an input of the clock signal at the base frequency. - View Dependent Claims (11)
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12. A system for generating a frequency reference in a hybrid communications device, comprising:
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a clock source generating a clock signal at a base frequency;
a communications receiver, the communications receiver performing communications processing based on an input of the clock signal at the base frequency, the communications receiver generating frequency tracking data containing a moving average of frequency error, a frequency drift rate and a drift rate uncertainty;
a positioning receiver, the positioning receiver performing positioning processing based on an input of the clock signal at the base frequency; and
a processor, the processor transmitting a control message to the positioning receiver to adapt positioning processing based on the frequency tracking data, the processor communicating with the communications receiver and the positioning receiver. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification