ESAs Navigation Support Office contributes to the determination of the orientation of the Earth in the International Celestial Reference Frame and to the generation of the International Terrestrial Reference Frame (ITRF). This is achieved by an active involvement in numerous international initiatives, comities and services, by providing observation data and by operating analysis and combination centres of the IGS, the ILRS and the IDS.
ESAs Navigation Support Office is providing precise orbit and clock, atmospheric and Earth orientation parameter products for numerous ESA and non-ESA LEO, MEO, GEO and HEO missions. Further products are Earth Orientation Parameters and precise station coordinates for ESA's GNSS Observation Network (EGON), the Galileo Sensor Stations (GSS) and the IGS tracking network, which are an important input for the generation of Geodetic Reference Frames.
The Geodetic reference activities are supplemented by its contribution to ESAs UTC realisation. UTC(ESA) is a joint activity between the Radio Frequency Systems & Payloads Office in ESTEC, the Station Subsystems Section and the Navigation Support Office in ESOC.