SpaceX Defends ITU EPFD Limits as Protecting GSOs
ITU equivalent power flux-density (EPFD) limits are more than enough to protect geostationary orbit (GSO) satellites from nongeostationary orbit (NGSO) satellites, SpaceX said in an FCC docket 16-408 filing posted Thursday. It said once its NGSO constellation is operational, it…
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will likely use 3,300 earth stations over a service area of 110 million square kilometers, slightly less than the planet's land surface. It said worst-case interference from those earth stations for reference antennas would be negligible and even if five similar NGSO systems were operating at the EPFD limit, the aggregate interference "would still be very reasonable." The company said when a SpaceX earth station is in the boresight of a geostationary antenna emitting the maximum planned effective isotropic radiated power toward the GSO arc, the interference would still be negligible. ViaSat said the FCC needs to adopt stricter EPFD limits.