Orbit determination of the SELENE satellites using multi-satellite data types and evaluation of SELENE gravity field models
Autor: | Goossens, Sander, Rowlands, D. D., Lemoine, F. G., Matsumoto, Koji, Noda, Hirotomo, Araki, Hiroshi |
---|---|
Rok vydání: | 2011 |
Předmět: |
law.invention
Orbit determination Orbiter symbols.namesake Geochemistry and Petrology law Very-long-baseline interferometry Altimeter Computers in Earth Sciences Lunar gravity Remote sensing Physics Lunar satellite orbits business.industry Tracking system Laser altimetry crossovers Geodesy Geophysics Physics::Space Physics symbols Satellite Astrophysics::Earth and Planetary Astrophysics Orbit (control theory) business Doppler effect |
Zdroj: | Journal of Geodesy. 85:487-504 |
ISSN: | 1432-1394 0949-7714 |
Popis: | The SELENE mission, consisting of three separate satellites that use different terrestrial-based tracking systems, presents a unique opportunity to evaluate the contribution of these tracking systems to orbit determination precision. The tracking data consist of four-way Doppler between the main orbiter and one of the two sub-satellites while the former is over the far side, and of same-beam differential VLBI tracking between the two sub-satellites. Laser altimeter data are also used for orbit determination. The contribution to orbit precision of these different data types is investigated through orbit overlap analysis. It is shown that using four-way and VLBI data improves orbit consistency for all satellites involved by reducing peak values in orbit overlap differences that exist when only standard two-way Doppler and range data are used. Including laser altimeter data improves the orbit precision of the SELENE main satellite further, resulting in very smooth total orbit errors at an average level of 18 m. The multi-satellite data have also resulted in improved lunar gravity field models, which are assessed through orbit overlap analysis using Lunar Prospector tracking data. Improvements over a pre-SELENE model are shown to be mostly in the along-track and cross-track directions. Orbit overlap differences are at a level between 13 and 21 m with the SELENE models, depending on whether 1-day data overlaps or 1-day predictions are used. |
Databáze: | OpenAIRE |
Externí odkaz: |