Frequency Calibration Based on the Adaptive Neural-Fuzzy Inference System

被引:9
作者
Hsu, Wang-Hsin [1 ,2 ]
Tu, Kun-Yuan [2 ]
Wu, Jung-Shyr [3 ]
Liao, Chia-Shu [4 ]
机构
[1] Natl Cent Univ, Dept Elect Engn, Tao Yuan 32001, Taiwan
[2] Vanung Univ, Dept Comp Sci & Informat Engn, Chungli 32061, Taiwan
[3] Natl Cent Univ, Grad Inst Commun Engn, Chungli 32001, Taiwan
[4] Chunghwa Telecom Co Ltd, Telecommun Labs, Chungli 32601, Taiwan
关键词
Adaptive neural-fuzzy inference system (ANFIS); calibration; frequency; frequency stability; holdover;
D O I
10.1109/TIM.2008.2011109
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
080906 [电磁信息功能材料与结构]; 082806 [农业信息与电气工程];
摘要
This paper proposes a novel frequency-calibration approach based on an adaptive neural-fuzzy inference system (ANFIS). In normal mode, an oven-controlled crystal oscillator (OCXO) is steered by integrating a time-interval counter, a fuzzy controller, a digital-to-analog (D/A) converter, and other components such that its frequency can follow a primary cesium atomic clock. In addition, under the effects of aging on the OCXO and the variation in ambient temperature, the control messages are collected to train an ANFIS in this mode. When the system enters holdover mode, the control messages predicted by the ANFIS are used to steer the OCXO to maintain its performance within the tolerance required by user applications. Experimental results indicate that the frequency stability of the OCXO can be improved from a few parts in 10(10) to 10(13) for an average time of one day in normal mode, and its frequency stability can be maintained within a few parts in 10(12) over a measurement period of one day in holdover mode.
引用
收藏
页码:1229 / 1233
页数:5
相关论文
共 10 条
[1]
*3GPP TS, 2005, 25133 3GPP TS
[2]
[Anonymous], 2006, IEEE Standard 802.16--2005
[3]
[Anonymous], 1995, CDMA: Principles of Spread Spectrum Communication
[4]
[Anonymous], IEEE T SYST MAN CYB
[5]
DAVIS JA, 1999, P FREQ TIM FOR IEEE, V1, P291
[6]
Driankov D., 1992, INTRO FUZZY CONTROL
[7]
ESKELINEN P, 1999, P FREQ TIM FOR IEEE, V1, P186
[8]
Nicholls C. W. T., 2004, Proceedings of the 2004 IEEE International Frequency Control Symposium And Exhibition (IEEE Cat. No.04CH37553C), P509
[9]
*TTA STD, 2004, SPEC 2 3 GHZ BAND PO
[10]
TU KY, 2008, P C PREC EL MEAS BRO, P616