Long-wavelength lunar gravity field recovery from simulated orbit and inter-satellite tracking data |
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Authors: | Jianguo Yan Oliver Baur Li Fei Ping Jinsong |
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Affiliation: | 1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430070, China;2. Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria;3. RISE Project, National Astronomical Observatory of Japan, Oshu 0230861, Japan;4. National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China |
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Abstract: | As has been demonstrated recently, inter-satellite Ka-band tracking data collected by the GRAIL (Gravity Recovery And Interior Laboratory) spacecraft have the potential to improve the resolution and accuracy of the lunar gravity field by several orders of magnitude compared to previous models. By means of a series of simulation studies, here we investigate the contribution of inter-satellite ranging for the recovery of the Moon’s gravitational features; the evaluation of results is made against findings from ground-based Doppler tracking. For this purpose we make use of classical dynamic orbit determination, supported by the analysis of satellite-to-satellite tracking observations. This study sheds particularly light on the influence of the angular distance between the two satellites, solar radiation modeling and the co-estimation of the lunar Love number k2. The quality of the obtained results is assessed by gravity field power spectra, gravity anomalies and precision orbit determination. We expect our simulation results to be supportive for the processing of real GRAIL data. |
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Keywords: | Satellite-to-satellite tracking Doppler tracking Lunar gravity field GRAIL Precision orbit determination |
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