Method and system for frequency drift prediction

Details Method and system for frequency drift prediction Method and system for frequency drift prediction

2006-03-14

2006-03-14

Issing, Gregory C. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357490, C342S357490

Reexamination Certificate

active

07012563

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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