Airbus Defence and Space Gmbh

Alexander Zenzinger

Francis Soualle

Jean-Jacques Floch

Stefan Sassen

Oliver Baur

Mahamoudou Ouedraogo

Jens Heim

A method for each of a plurality of satellites of a secondary Global Navigation Satellite System, GNSS, in a Low Earth Orbit, LEO, comprising receiving GNSS signals, in a first frequency band, from Line-Of-Sight, LOS, satellites of at least one primary GNSS in a Medium Earth Orbit. Candidate sets of orbit and clock corrections for the LOS satellites are received. A Position-Velocity-Time, PVT, calculation is performed based on code and/or carrier pseudo-ranges between a respective satellite of the secondary GNSS and the LOS satellites. The code and/or carrier pseudo-ranges are derived from the GNSS signals and are corrected by a single set of the candidate sets. A short-term prediction model is determined for an orbit and clock of the respective satellite based on the PVT and is included in a navigation message, transmitted in a second frequency band, modulated onto a LEO navigation signal intended for terrestrial user equipment.

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Landshut, Germany

Alexander Zenzinger