Automatic Frequency Calibration Using a Fuzzy Logic Controller

Ching-Haur Chang, Chia-Shu Liao, Kun-Yuan Tu

Abstract:	A way of frequency calibration using fuzzy logic controller (FLC) is presented in this paper. Generally, atomic clocks tend to drift due to temperature, aging, or some environmental effects. It is sure that one cannot compensate for the drift with a fixed amount of control quantity. As a controller, it has the task to adaptively catch up with the variation. Our approach takes advantage of FLC to determine the control quantity. Three procedures are employed in our approach. Firstly the performance of the device being calibrated is observed continuously. Then the FLC uses the performance data to generate the control quantity, Finally the FLC calibrates the device using the computed control quantity. The FLC can calibrate the device at any time since the performance of the device is continuously being monitored In the experiment, we use FMAS (Frequency Measurement and Analysis System) as the performance evaluation equipment and the FLC is realized by a PC. In the experiment, a cesium-beam oscillator is chosen as the target. The result validates the effectiveness of our approach. An oscillator with frequency offset of --1.4 x 10^-13 can be improved to approximate& - 1.0 x 10^-l4 after one week of calibration.
Published in:	Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 3, 1998 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	83 - 88
Cite this article:	Chang, Ching-Haur, Liao, Chia-Shu, Tu, Kun-Yuan, "Automatic Frequency Calibration Using a Fuzzy Logic Controller," Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1998, pp. 83-88.
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