Correction of Ionospheric Effects for the Precise Orbit Determination of Satellites,
CENTRE NATIONAL D'ETUDES DES TELECOMMUNICATIONS LANNION (FRANCE)
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In a near future, space missions in altimetry, geodesy or precise positioning will often require satellite orbits to be determined with subdecimetric accuracies. In orbit determination systems extensive use is made of Doppler measurements performed on radio signals propagating between the satellite and ground stations. Such systems, however, are highly sensitive to propagation errors brought about by the atmosphere. In this paper the effects of the ionosphere on Doppler measurements is assessed and a model of the ionospheric error is described. A correction scheme is examined for orbit determination systems based on Doppler data. A correction scheme is examined for orbit determination systems based on Doppler data. Particular emphasis is placed on the post-processing of the Doppler data from the DORIS system, a precise orbit determination system designed for remote sensing satellites of the new generation. Simulation results show that the major part of the ionospheric error can be removed by model correction.
- Radiofrequency Wave Propagation