Orbit determination of the Lunar Reconnaissance Orbiter |
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| Authors: | Email author" target="_blank">Erwan?MazaricoEmail author D?D?Rowlands G?A?Neumann D?E?Smith M?H?Torrence F?G?Lemoine M?T?Zuber |
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| Institution: | (1) Massachusetts Institute of Technology, Cambridge, USA;(2) NASA Goddard Space Flight Center, Planetary Geodynamics Laboratory, Greenbelt, USA;(3) S.G.T. Inc., Greenbelt, USA |
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| Abstract: | We present the results on precision orbit determination from the radio science investigation of the Lunar Reconnaissance Orbiter
(LRO) spacecraft. We describe the data, modeling and methods used to achieve position knowledge several times better than
the required 50–100 m (in total position), over the period from 13 July 2009 to 31 January 2011. In addition to the near-continuous
radiometric tracking data, we include altimetric data from the Lunar Orbiter Laser Altimeter (LOLA) in the form of crossover
measurements, and show that they strongly improve the accuracy of the orbit reconstruction (total position overlap differences
decrease from ~70 m to ~23 m). To refine the spacecraft trajectory further, we develop a lunar gravity field by combining
the newly acquired LRO data with the historical data. The reprocessing of the spacecraft trajectory with that model shows
significantly increased accuracy (~20 m with only the radiometric data, and ~14 m with the addition of the altimetric crossovers).
LOLA topographic maps and calibration data from the Lunar Reconnaissance Orbiter Camera were used to supplement the results
of the overlap analysis and demonstrate the trajectory accuracy. |
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