Title :
Detection of Anomalies in the Behavior of Atomic Clocks
Author :
Nunzi, Emilia ; Galleani, Lorenzo ; Tavella, Patrizia ; Carbone, Paolo
Author_Institution :
Dipt. di Ingegneria Elettronica e dell´´Informazione, Universita degli Studi di Perugia
fDate :
4/1/2007 12:00:00 AM
Abstract :
In this paper, the problem of identifying variations in the nature of atomic clock noise is addressed. Two methods are proposed. One method is based on a generalized likelihood ratio test (GLRT), and the other is based on the dynamic Allan variance (DAVAR), which is a representation of the instantaneous clock stability that is able to point out possible nonstationary behaviors. Both methods efficiently track variations in the experimental clock data and, thus, appear as suitable tools for the detection of atomic clock anomalies
Keywords :
atomic clocks; frequency stability; noise measurement; time measurement; anomaly detection; atomic clock; clock stability; dynamic Allan variance; generalized likelihood ratio test; nonstationary behaviors; nonstationary noise; Associate members; Atomic clocks; Data analysis; Frequency measurement; Global Positioning System; Navigation; Performance evaluation; Signal to noise ratio; Stability; Testing; Anomaly detection; atomic clock; dynamic Allan variance (DAVAR); generalized likelihood ratio test (GLRT); nonstationary noise;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.891118
