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

Volume

56

Issue

2

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

523

Lastpage

528

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;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2007.891118

Filename

4126899