NDLI: Combined multi-system GNSS analysis for time and frequency transfer

Content Provider	IEEE Xplore Digital Library
Author	Dach, R. Schaer, S. Hugentobler, U. Schildknecht, T. Gade, A.
Copyright Year	2006
Description	Author affiliation: Fed. Office of Topography (swisstopo), Switzerland (Schaer, S.) \|\| Astron. Inst., Univ. of Bern, Bern, Switzerland (Dach, R.; Hugentobler, U.; Schildknecht, T.; Gade, A.)
Abstract	The Center for Orbit Determination in Europe (CODE) is one of the Analysis Centers (AC) of the International GNSS Service (IGS). It is located at the Astronomical Institute of the University of Bern (AIUB). Since May 2003, CODE provides consistent GPS and GLONASS satellite orbits from a combined analysis using the Bernese GPS Software package. The data of about 30 stations in the IGS network that are equipped with GNSS receivers tracking GPS as well as GLONASS satellites are analyzed for that purpose together with numerous stations that only track the GPS satellites. With the background of the experience in orbit determination for more than one satellite system, we discuss the use of both GPS and GLONASS observations in a combined analysis for geodetic time and frequency transfer using code and phase measurements. The number of satellites that can be used for time transfer is increased when adding the GLONASS observations to the analysis. This may help to improve the redundancy for the receiver clock parameters that are estimated for each station from all satellites in view. GLONASS satellites emit the signals on individual frequencies. This may lead to frequency-dependent biases in the receivers that have been investigated, e.g., in [1]. Of course, these biases must be considered in a combined analysis of GPS and GLONASS code data. Corresponding parameters can be estimated for all GNSS receivers even if they are not connected to an external reference clock. This offers the possibility to investigate the frequency-dependent biases for all receiver types that are represented in the IGS network. The estimated biases can be interpreted as a relative “calibration” of each individual frequency used by a GLONASS satellite with respect to the GPS frequency.
Starting Page	530
Ending Page	537
File Size	863061
Page Count	8
File Format	PDF
ISBN	9781467326421
e-ISBN	9783980574181
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-03-27
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	PTB
Subject Keyword	GNSS carrier phase Satellites Global Navigation Satellite Systems Satellite broadcasting Time transfer GLONASS interfrequency code biases Receivers Orbits Frequency transfer Global Positioning System Clocks
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
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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