NDLI: High-rate clock variations of the Galileo IOV-1/2 satellites and their impact on carrier tracking by geodetic receivers

Content Provider	Springer Nature Link
Author	Montenbruck, O. Hauschild, A. Häberling, S. Braun, B. Katsigianni, G. Hugentobler, U.
Copyright Year	2015
Abstract	The carrier signals of the first two Galileo satellites, IOV-1 and IOV-2, exhibit subtle phase variations, which may cause high-rate oscillations in carrier phase measurements of geodetic-grade receivers as well as associated Doppler measurement errors. The carrier phase oscillations slightly exceed the noise level of the measurements and have been attributed to a subtle cross talk of signals from two active atomic frequency standards in the clock monitoring and control unit (CMCU). This cross talk is only present in the first two IOV satellites, and its practical implications have partly been compensated by now through a suitable configuration of the CMCU. Nevertheless, a proper understanding of the phenomenon is deemed relevant to the interpretation of Galileo IOV measurements collected with global ground networks in the 2012 to early 2015 time frame. Also, the data collected so far offer valuable insight into the tracking of high-frequency signal variation of geodetic receivers that are of interest for applications such as structural monitoring or earthquake research. We present practical measurements from zero-baseline tests of common geodetic receivers with data rates of 1/30–1 Hz as well as dedicated tests with high-rate (50–100 Hz) receivers to evidence the phenomenon. Efforts are made to understand the different response of specific receivers based on generic receiver tracking and measurement generation concepts.
Starting Page	43
Ending Page	52
Page Count	10
File Format	PDF
ISSN	10805370
Journal	GPS Solutions
Volume Number	21
Issue Number	1
e-ISSN	15211886
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-11-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Galileo Clock oscillation CMCU Geophysics/Geodesy Atmospheric Sciences Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) Automotive Engineering Electrical Engineering
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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