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- W2056540171 abstract "The Theory of General Relativity (GR) can be tested by precisely measuring the shift of a spacecraft trajectory due to GR as it flies near the Sun. We apply the PPN metric to define the governing equations of motion for the spacecraft, and carry out a covariance analysis to estimate the Eddington-Robertson-Schiff parameters, γ and β, by simulating radiometric measurements of range, Very Long Baseline Interferometry, and Doppler. We show that the transient effect of GR over a short timespan is measurable to a significant level and that there is a potential for obtaining independent estimates of γ and β. Assuming the spacecraft state as the only additional uncertain parameters, our baseline study gives 1-σ accuracies of σγ=8.90×10−5 and σβ=4.09×10−4 with X-band tracking capability, and potentially an order of magnitude reduction if a K-band tracking system is used. These numbers serve as a lower bound on accuracy. When the additional uncertainties of station location errors, unmodeled non-gravitational accelerations, and solar quadrupole moment are included, σγ and σβ can rise by one to two orders of magnitude. We show that these estimates are highly sensitive to the relative geometry between the spacecraft and Earth tracking stations, and discuss the bounds on error sources needed to achieve significant accuracies." @default.
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- W2056540171 date "2004-09-01" @default.
- W2056540171 modified "2023-09-26" @default.
- W2056540171 title "A Test of General Relativity: Estimating PPN parameters γ and β from Spacecraft Radiometric Tracking Data" @default.
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- W2056540171 doi "https://doi.org/10.1016/j.nuclphysbps.2004.08.028" @default.
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