An Efficient and Configurable Preprocessing Algorithm to Improve Stability Analysis
- 30 October 2015
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 63 (4), 575-581
- https://doi.org/10.1109/tuffc.2015.2496280
Abstract
The Allan variance (AVAR) is widely used to measure the stability of experimental time series. Specifically, AVAR is commonly used in space applications such as monitoring the clocks of the global navigation satellite systems (GNSSs). In these applications, the experimental data present some peculiar aspects which are not generally encountered when the measurements are carried out in a laboratory. Space clocks' data can in fact present outliers, jumps, and missing values, which corrupt the clock characterization. Therefore, an efficient preprocessing is fundamental to ensure a proper data analysis and improve the stability estimation performed with the AVAR or other similar variances. In this work, we propose a preprocessing algorithm and its implementation in a robust software code (in MATLAB language) able to deal with time series of experimental data affected by nonstationarities and missing data; our method is properly detecting and removing anomalous behaviors, hence making the subsequent stability analysis more reliable.Keywords
This publication has 11 references indexed in Scilit:
- Detection of atomic clock frequency jumps with the Kalman filterIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2012
- INRIM Tool for Satellite Clock Characterization: Frequency Drift Estimation and RemovalMAPAN, 2012
- Application of the Dynamic Allan Variance for the Characterization of Space Clock BehaviorIEEE Transactions on Aerospace and Electronic Systems, 2011
- The In-Orbit performances of GIOVE clocksIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2010
- The dynamic Allan varianceIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2009
- Detection and identification of atomic clock anomaliesMetrologia, 2008
- Estimating the Allan variance in the presence of long periods of missing data and outliersMetrologia, 2008
- Detection of Anomalies in the Behavior of Atomic ClocksIEEE Transactions on Instrumentation and Measurement, 2007
- Outliers in process modeling and identificationIEEE Transactions on Control Systems Technology, 2002
- The Identification of Multiple OutliersJournal of the American Statistical Association, 1993