Galilean satellite ephemeris improvement using Galileo tour encounter informationAccurate navigation of the satellite tour portion of the Galileo mission requires an accurate ephemeris of the Galilean satellites. The ephemeris is updated using radiometric and optical tracking data acquired during the satellite tour. The improved accuracy of the satellite ephemeris leads to improved targeting accuracy at subsequent encounters. The Galileo mission will benefit from improved targeting accuracy through reduced propellant costs and improved pointing accuracy. The predicted error in the updated ephemeris can be less than approximations inherent in the analytical theory used for the ephemeris, so an alternate numerical representation is applied. This alternate description shows promise but also raises questions of numerical stability.
Document ID
19880063155
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Murrow, D. W. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Jacobson, R. A. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking