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Detection and Identification of Faults in Clock Ensembles

Trainotti, Christian and Giorgi, Gabriele and Furthner, Johann (2019) Detection and Identification of Faults in Clock Ensembles. In: Proceedings of the 32nd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2019, pp. 3342-3358. Institute of Navigation. ION GNSS+ 2019, 16-20 Sep 2019, Miami, Florida, USA. ISSN 2331-5954

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Abstract

The quality of the positioning and time dissemination services provided by Global Navigation Satellite Systems is tightly coupled with the provision of a stable system time scale. The robustness of time generation is important to ensure the continuity of service without performance degradation. A well-established method to generate a stable and robust time scale is the composite clock approach. Here, the contributions from each clock are combined to generate a weighted average, the so-called Implicit Ensemble Mean. A clock ensemble offers an enhanced robustness with respect to a system depending on a master clock, since the IEM is less sensitive to failures of single units. The time scale generation can be monitored by employing Fault Detection and Identification techniques. These are based on statistical tests designed to detect and identify faults at single clocks. In this work, these techniques are applied to provide statistically rigorous fault detectors for an ensemble of clocks. The clock composition algorithm can be equipped with a number of statistical tests, which are applied to detect and identify abrupt events (e.g. phase and frequency jumps) and slow deviations from the nominal expected clock behavior.

Item URL in elib:https://elib.dlr.de/129721/
Document Type:Conference or Workshop Item (Speech)
Title:Detection and Identification of Faults in Clock Ensembles
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Trainotti, ChristianChristian.Trainotti (at) dlr.deUNSPECIFIED
Giorgi, Gabrielegabriele.giorgi (at) dlr.dehttps://orcid.org/0000-0003-0552-9790
Furthner, JohannJohann.Furthner (at) dlr.deUNSPECIFIED
Date:October 2019
Journal or Publication Title:Proceedings of the 32nd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 3342-3358
Publisher:Institute of Navigation
ISSN:2331-5954
Status:Published
Keywords:clock, ensemble, composition, fault, detection, identification
Event Title:ION GNSS+ 2019
Event Location:Miami, Florida, USA
Event Type:international Conference
Event Dates:16-20 Sep 2019
Organizer:The Institute of Navigation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben GNSS2/Neue Dienste und Produkte
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Trainotti, Christian
Deposited On:25 Oct 2019 09:39
Last Modified:25 Oct 2019 09:39

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