Recursive frequency aging estimation and prediction devices, met

Details Recursive frequency aging estimation and prediction devices, met Recursive frequency aging estimation and prediction devices, met

1997-06-05

1998-08-04

Trammell, James P.

Boots, shoes, and leggings

364572, G01R 2300

Patent

active

057904120

ABSTRACT:
A recursive crystal oscillator aging estimation and prediction device is vided comprising a crystal oscillator connected to a calculation means having several software programs, including frequency aging calculation algorithms based on new mathematical models for estimating and predicting frequency aging, respectively. The calculation means, being an oscillator model, and having a means to use a plurality of shifted logarithmic functions which describe the effects of a given frequency output of said crystal oscillator is connected to a frequency correction circuit. When a frequency reference is available, the calculation means performs a plurality of parameter. When a frequency reference is not available, an output of oscillator is compared to an output of the oscillator model of the calculation means, resulting in a frequency error, which is then fed to the crystal oscillator to correct the frequency with the calculation means acting as a temporary frequency reference to correct the frequency error within said frequency output. The present invention also discloses recursive crystal oscillator aging estimation and prediction methods and a computer-readable medium whose contents cause a computer system to recursively estimate and predict the aging of a crystal oscillator, as an article of manufacture.

REFERENCES:
patent: 4949055 (1990-08-01), Leitl
patent: 5512863 (1996-04-01), Vig et al.
patent: 5659884 (1997-08-01), Daughtry, Jr. et al.

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