Abstract
The influence of Earth orientation parameters inaccuracy on the Earth’s gravitational acceleration calculation error when predicting spacecraft motion is analyzed, for the example of GPS satellites. This influence is compared with the error introduced by the EGM-96 and EGM-2008 geopotential models, with and without taking account of the actual data of the polar motion and the Earth`s rotation irregularity according to final С04 bulletins of the International Earth Rotation and Reference Systems Service (IERS). Parameters of the GPS spacecraft real orbit are compared with that formed by integration of the perturbed motion equations. The contribution of uncertain factors to the error of modeling the trajectory of navigation system satellites is demonstrated. The results obtained demonstrate the impact level of EOPs errors on the accuracy of navigation satellite orbits prediction and expand the scope for creating models of errors in the ephemeris of global satellite systems due to uncontrolled factors of various nature.
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Translated by B. Gilbert
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Kozorez, D.A., Krasil’shchikov, M.N. & Kruzhkov, D.M. The Earth Orientation Parameters Inaccuracy and Spacecraft Motion Prediction Errors. 2. GPS Satellites. Russ. Engin. Res. 40, 1132–1134 (2020). https://doi.org/10.3103/S1068798X20120370
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DOI: https://doi.org/10.3103/S1068798X20120370