Technical analysis and engineering reference.
Radio frequency spectrum is governed internationally by the International Telecommunication Union (ITU), a specialized agency of the United Nations. Under the international treaty framework of the ITU Radio Regulations, satellite constellations do not 'own' spectrum; they receive operating priority based on the date of their formal national filing (advance publication and coordination).
To prevent Non-Geostationary (NGSO) mega-constellations from blinding legacy Geostationary (GSO) television and telecommunications satellites, ITU Article 22 imposes strict EPFD limits: - When a low-orbit satellite's trajectory crosses within a specified angular exclusion zone of a geostationary orbital arc, the LEO satellite must shut off active beams pointing at Earth terminals. - Sophisticated phase nulling algorithms steer beams away from the equatorial GSO belt in real time.
NTNStandard maintains automated compliance tools that calculate EPFD interference vectors across overlapping orbital planes, enabling satellite operators to reach bilateral technical coordination agreements with civil and military frequency incumbents.