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JASON-1 Precise Orbit Determination (POD)with SLR and DORIS TrackingJason-1, the TOPEX/POSEIDON (T/P) radar altimeter follow-on, is intended to continue measurement of the ocean surface with the same, if not better accuracy. T/P has demonstrated that, the time variation of ocean topography can be determined with an accuracy of a few centimeters, thanks to the availability of highly accurate orbits based on SLR and DORIS tracking. For verification and cross-calibration, Jason-1, was initially injected into the T/P orbit, flying just 72 seconds ahead of T/P. This configuration lasted over 21 Jason cycles. In mid-August T/P was maneuvered into its final tandem configuration, a parallel groundtrack, in order to improve the combined coverage. Preliminary investigations using cycles 1-9, shown at the June 2002 SWT, indicated that nominal Jason orbits can achieve the 2-3 cm accuracy objective, however several puzzling aspects of SLR and DORIS measurement modeling were also observed. This paper presents recent analysis of Jason SLR+DORIS POD spanning more than 20 cycles, and revisits several of the more puzzling issues, including estimation of the Laser Retroreflector Array (LRA) offset. The accuracy of the orbits and of the measurement modeling are evaluated using several tests, including SLR, DORIS, and altimeter crossover residual analysis, altimeter collinear analysis, and direct comparison with GPS and other orbits. T/P POD results over the same period are used as a reference.
Document ID
20030032291
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Zelensky, N. P.
(Raytheon Information Technology and Scientific Services Greenbelt, MD, United States)
Luthcke, S. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rowlands, D. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Beckley, B. D.
(Raytheon Information Technology and Scientific Services Greenbelt, MD, United States)
Lemoine, Frank G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wang, Y. M.
(Raytheon Information Technology and Scientific Services Greenbelt, MD, United States)
Chinn, D. S.
(Raytheon Information Technology and Scientific Services Greenbelt, MD, United States)
Williams, T. A.
(Raytheon Information Technology and Scientific Services Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Subject Category
Optics
Meeting Information
Meeting: Jason-1/TOPEX/Poseidon Science Working Team Meeting
Location: New Orleans, LA
Country: United States
Start Date: October 21, 2002
End Date: October 23, 2002
Distribution Limits
Public
Copyright
Other

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