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Prototype of the DLR operational composite clock: methods and test cases

Suess, Matthias und Hammesfahr, Jens (2009) Prototype of the DLR operational composite clock: methods and test cases. 41st Annual Precise Time and Time Interval Meeting (PTTI), November 16 - 19, 2009, Santa Ana Pueblo, New Mexico.

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Kurzfassung

The operational implementation of the ensemble Kalman filter Composite Clock (CC developed by K. R. Brown), is subject of the paper. Although the mathematical background of the CC is well-known, its autonomous and robust operation in a clock laboratory requires further modifications of the CC. The suitable initialization of the first ensemble estimate is discussed. Due to the fact, that only difference measurements are available, there is a dimensional degree of freedom in the first as in the following ensemble estimates. Furthermore, to guarantee a robust, consistent, and autonomous estimation of the ensemble clocks, a consistency check is described. It outputs a so-called consistency matrix which describes the active and nonactive clocks. Since the identified active clocks can change from measurement to measurement, the corresponding Kalman filter (KF) parameters are adapted in a consistent way. Finally, the non-active clocks are estimated based on the KF output. The performance of the OCC using an ensemble of five DLR laboratory clocks, measured over a period of one year, is outlined. The clock ensemble consists of three high-performance Cesiumclocks (HP5071A), an active H-Maser (CH1-75) and a GPS disciplined Rb clock. Although miscellaneous anomalies like phase steps, outliers and clock exclusions arise, the OCC autonomously processes the five ensemble clocks and establishes a robust system time. Analysis results of this ensemble with different types of clocks when applying the OCC are presented.

elib-URL des Eintrags:https://elib.dlr.de/62197/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Prototype of the DLR operational composite clock: methods and test cases
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Suess, Matthiasmatthias.suess (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hammesfahr, Jensjens.hammesfahr (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:November 2009
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:composite clock, DLR, operational, kalman filter, filtering
Veranstaltungstitel:41st Annual Precise Time and Time Interval Meeting (PTTI)
Veranstaltungsort:Santa Ana Pueblo, New Mexico
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:November 16 - 19, 2009
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W KN - Kommunikation/Navigation
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W KN - Kommunikation/Navigation
DLR - Teilgebiet (Projekt, Vorhaben):W - Projekt Galileo Advanced Applications (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Kommunikation und Navigation > Navigation
Hinterlegt von: Süß, Matthias
Hinterlegt am:11 Jan 2010 11:43
Letzte Änderung:31 Jul 2019 19:26

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