RECOMMENDATION ITU-R S.1069* - Compatibility between the fixed-satellite service and the space ... ANNEX 1 - Maximum pfd levels produced at the geostationary orbit by space stations in the space science services ANNEX 2 - Guidelines for the operation of satellites in the space science services ... 1 Protection of FSS satellites in the GSO (see Note 1) 2 Interference environment for the space science services