NDLI: DORIS time bias estimated using Jason-1, TOPEX/Poseidon and ENVISAT orbits

Content Provider	Springer Nature Link
Author	Zelensky, Nikita P. Berthias, Jean Paul Lemoine, Frank G.
Copyright Year	2006
Abstract	DORIS is a globally distributed, all-weather satellite tracking system providing near-continuous precise Doppler coverage of the TOPEX/Poseidon (T/P), Jason-1, ENVISAT, and SPOT series of satellites. The DORIS system, which has been critical in establishing the high-precision orbit determination standards now enjoyed by these missions, continues to evolve and improve. There is a small, 5 to 10 μs, discrepancy between the DORIS time-tag computed by Centre National d’Etudes Spatiales (CNES) using the DORIS timing data, and a time-tag estimated using DORIS range-rate data with respect to orbits referred to Satellite Laser Ranging (SLR) or Global Positioning System (GPS) time. This discrepancy is evaluated using DORIS time biases estimated over T/P, Jason-1, and ENVISAT orbits, which are computed using SLR or GPS tracking and reference SLR or GPS time. Although DORIS is installed on other satellites, these are the only three where the DORIS time bias can be observed with the help of an alternate tracking system – SLR or GPS. For T/P, Jason-1 and ENVISAT, this DORIS time bias quantities to 5–10 μs. Over the span of the T/P mission following cycle 92, this time bias has ranged from +10 to − 10 μs. This paper addresses the precision and nature of the estimated time biases by evaluating such estimates over orbits computed with various gravity field models, computed using SLR + DORIS and GPS tracking, and computed by the Goddard Space Flight Center (GSFC), Jet Propulsion Laboratory (JPL), and CNES analysis centers. The paper includes descriptions of the DORIS measurement, time-tag processing, expected time-tag error, and time bias estimation. In describing the estimated DORIS time bias, the paper offers a new approach for evaluating the DORIS resolution capability.
Starting Page	497
Ending Page	506
Page Count	10
File Format	PDF
ISSN	09497714
Journal	Journal of Geodesy
Volume Number	80
Issue Number	8-11
e-ISSN	14321394
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-07-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	DORIS Precise orbit determination (POD) Time-tag error TOPEX/Poseidon (T/P) Jason-1 ENVISAT SLR GPS IDS Math. Applications in Geosciences Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology Computers in Earth 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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