GRAIL SCIENCE DATA SYSTEM ORBIT DETERMINATION: APPROACH, STRATEGY, AND PERFORMANCE

摘要

This paper details orbit determination techniques and strategies employed withineach stage of the larger iterative process (ref. Kruizinga et al., this meeting) ofpreprocessing raw GRAIL data into the gravity science measurements used withingravity field solutions. Each orbit determination pass used different data, correctionsto them, and/or estimation parameters. We compare performance metricsamong these passes. For example, for the primary mission, the magnitude ofresiduals using our orbits progressed from ≈19.4 to ≈0.077 μm/s for inter-satelliterange rate data and from ≈0.4 to ≈0.1 mm/s for Doppler data.