Accuracy of mean earth ellipsoid based on Doppler,laser and altimeter observations |
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| Authors: | Richard J Anderle |
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| Institution: | (1) Naval Surface Weapons Center, 22448 Dahlgren, Virginia, (U.S.A.) |
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| Abstract: | The error in the mean earth ellipsoid computer on the basis of Doppler or laser observations of artificial earth satellites
or radar altimeter observations of the ocean surface from a satellite depends upon instrument precision, on uncertainties
in the specification of the earth's gravity field at both long and short wave lengths, on uncertainties in the origin of the
coordinate system, on modeling errors in ionospheric (except laser) and tropospheric refraction, and, for altimetry, on oceanographic
effects. The magnitude of the uncertainty in the computed ellipsoid will vary depending on the size of these errors and on
the number and distribution of observation stations. Review of computations based on various data sets indicates that differences
in the computed ellipsoids are consistent with those expected due to the various error sources and that the best fitting ellipsoid
has a semi-major axis of6378136±2 m. |
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