Backup Hydrogen Maser Steering System for Galileo Precise Timing Facility
Joint Authors
Rochat, Pascal
Wang, Qinghua
Stehlin, Xavier
Source
International Journal of Navigation and Observation
Issue
Vol. 2008, Issue 2008 (31 Dec. 2008), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2008-01-03
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
Two hydrogen masers (HMs) are used in the Precise Timing Facility to provide the physical realization of Galileo System Time, insuring the extremely high short-term stability required for the navigation functions.
In order to allow a smooth switch over between backup and primary HMs, the “backup HM steering algorithm” is developed.
This acquires the phase difference measured between two HMs, computes a steering correction, and generates the steering correction to the backup HM via a PicoStepper with a 0.1-picosecond resolution.
The algorithm design is based on outlier removal and a proportional-integral filtering controller.
To verify the steering operability and the loop performance, the overall backup HM steering system is simulated using real HM-HM measurements, and with simulated anomalies (phase/frequency spikes, jumps, and drift).
American Psychological Association (APA)
Wang, Qinghua& Rochat, Pascal& Stehlin, Xavier. 2008. Backup Hydrogen Maser Steering System for Galileo Precise Timing Facility. International Journal of Navigation and Observation،Vol. 2008, no. 2008, pp.1-6.
https://search.emarefa.net/detail/BIM-494086
Modern Language Association (MLA)
Wang, Qinghua…[et al.]. Backup Hydrogen Maser Steering System for Galileo Precise Timing Facility. International Journal of Navigation and Observation No. 2008 (2008), pp.1-6.
https://search.emarefa.net/detail/BIM-494086
American Medical Association (AMA)
Wang, Qinghua& Rochat, Pascal& Stehlin, Xavier. Backup Hydrogen Maser Steering System for Galileo Precise Timing Facility. International Journal of Navigation and Observation. 2008. Vol. 2008, no. 2008, pp.1-6.
https://search.emarefa.net/detail/BIM-494086
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-494086