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An ever increasing number of low Earth orbiting (LEO)\udsatellites is, or will be, equipped with retro-reflectors for\udSatellite Laser Ranging (SLR) and on-board receivers\udto collect observations from Global Navigation Satellite\udSystems (GNSS) such as the Global Positioning Sys-\udtem (GPS) and the Russian GLONASS and the European\udGalileo systems in the future. At the Astronomical Insti-\udtute of the University of Bern (AIUB) LEO precise or-\udbit determination (POD) using either GPS or SLR data is\udperformed for a wide range of applications for satellites at\uddifferent altitudes. For this purpose the classical numeri-\udcal integration techniques, as also used for dynamic orbit\uddetermination of satellites at high altitudes, are extended\udby pseudo-stochastic orbit modeling techniques to effi-\udciently cope with potential force model deficiencies for\udsatellites at low altitudes. Accuracies of better than 2 cm\udmay be achieved by pseudo-stochastic orbit modeling for\udsatellites at very low altitudes such as for the GPS-based\udPOD of the Gravity field and steady-state Ocean Circula-\udtion Explorer (GOCE)

Precise Orbit Determination of Low Earth Satellites at AIUB using GPS and SLR data