Statistics – Computation
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jansc..28..345m&link_type=abstract
Journal of the Astronautical Sciences, vol. 28, Oct.-Dec. 1980, p. 345-369.
Statistics
Computation
5
Altimeters, Orbital Position Estimation, Satellite Orbits, Seasat Satellites, Ephemerides, Geodynamics, Position Errors, Radiation Pressure, Satellite Drag, Satellite Tracking
Scientific paper
It is noted that major improvements have been made in the Goddard Space Flight Center (GSFC) geodynamic models for Seasat. It is pointed out that the dominant error source in Seasat ephemeris computation is currently the uncertainty in modeling the earth's gravity field. Attention is also given to significant errors arising from atmospheric drag and solar radiation pressure modeling. It is noted that a comparison of GSFC and Naval Surface Weapons Center (NSWC) Seasat ephemerides indicate the presence of an unexplained difference of about 4 m in the location of the center of mass along the Z axis. This difference is consistent with that obtained with earlier geoid and station coordinated comparisons performed by other investigators. It is expected that future combinations of Seasat and GEOS-3 altimeter data, together with laser and Unified S-Band tracking data, will ultimately produce a gravity field which allows computations of a global Seasat ephemeris with an rms radial accuracy of about 50 cm.
Marsh James G.
Williamson Ronald G.
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