NDLI: An investigation of GNSS atomic clock behavior at short time intervals

Content Provider	Springer Nature Link
Author	Griggs, Erin Kursinski, E. Robert Akos, Dennis
Copyright Year	2013
Abstract	A technique for obtaining clock measurements from individual GNSS satellites at short time intervals is presented. The methodology developed in this study allows for accurate satellite clock stability analysis without an ultra-stable clock at the ground receiver. Variations in the carrier phase caused by the satellite clock are isolated using a combination of common GNSS carrier-phase processing techniques. Furthermore, the white phase variations caused by the thermal noise of the collection and processing equipment are statistically modeled and removed, allowing for analysis of clock performance at subsecond intervals. Allan deviation analyses of signals collected from GPS and GLONASS satellites reveal distinct intervals of clock noise for timescales less than 100 s. The clock data collected from GPS Block IIA, IIR, IIR-M, and GLONASS satellites reveal similar stability performance at time periods greater than 20 s. The GLONASS clock stability in the 0.6–10 s range, however, is significantly worse than GPS. Applications that rely on ultra-stable clock behavior from the GLONASS satellites at these timescales may therefore require high-rate corrections to estimate and remove oscillator-based errors in the carrier phase.
Starting Page	443
Ending Page	452
Page Count	10
File Format	PDF
ISSN	10805370
Journal	GPS Solutions
Volume Number	18
Issue Number	3
e-ISSN	15211886
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-10-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Allan deviation Clock analysis GPS GLONASS Radio occultation Geophysics/Geodesy Atmospheric Sciences Extraterrestrial Physics, Space Sciences Automotive Engineering Electrical Engineering
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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