NDLI: Continuous Real-Time GPS Carrier Phase Based Frequency Transfer on Medium

Content Provider	IEEE Xplore Digital Library
Author	Rieck, C. Jarlemark, P. Jaldehag, K.
Copyright Year	2007
Description	Author affiliation: SP Tech. Res. Inst. of Sweden, Boras (Rieck, C.; Jarlemark, P.; Jaldehag, K.)
Abstract	We have studied a continuous real-time frequency transfer method on the SP-PTB baseline by using GPS carrier phase observations from geodetic GNSS receivers SP01 and PTBB, and post-processed two time periods in 2004 and 2007 with a continuous working filter under real-time conditions using integer phase ambiguity fixing. The results are a continuous time series of the relative time difference of the receiver clocks UTC(SP) and UTC(PTB), which was compared to results from TWSTFT between the two laboratories. We found that as long as the filter parameter modeling is well tuned and the necessary real-time orbit predictions are within a typical accuracy of a few 100 mm, the use of ambiguity resolution offers a correct estimation of the phase relations of the common phase measurements on this baseline. However, if errors in the orbit predictions are in the order of a few meters, which is generally difficult to detect in real-time, then a wrong resolution of the phase ambiguities can occur and thus create wrong phase and frequency estimates. Within the investigated time periods we have detected erroneous IGS orbit predictions in the order of 10 m, which caused a wrong estimation of phase relations. The paper quantifies the quality of current IGS orbit predictions and the impact of orbit errors on the ambiguity resolution for medium baselines. Continuous real-time frequency estimations are useful for system critical oscillator monitoring as for example in real-time interferometry applications, or as input for the calculation of real-time time scales.
Starting Page	950
Ending Page	954
File Size	1348384
Page Count	5
File Format	PDF
ISBN	9781424406463
ISSN	10756787
DOI	10.1109/FREQ.2007.4319220
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-05-29
Publisher Place	Switzerland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Global Positioning System Phase estimation Frequency estimation Real time systems Filters Phase detection Satellite navigation systems Clocks Laboratories Predictive models
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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