On August 31, 2026, SpaceX submitted a petition to the Federal Communications Commission (FCC) requesting that regulators block or attach strict operational conditions to a proposed satellite deployment by geostationary (GSO) operator Viasat.

In its filing, SpaceX argued that Viasat’s planned radio frequency allocation and orbital configuration would create harmful electromagnetic interference across Starlink’s Low Earth Orbit (LEO) megaconstellation.

Regulatory Context and Non-GSO Spectrum Governance

The regulatory petition represents the latest escalation in an ongoing dispute over spectrum access between low Earth orbit satellite broadband operators and incumbent geostationary satellite systems. The filing builds on previous regulatory filings where SpaceX and geostationary operators including Viasat and SES clashed over Equivalent Power Flux-Density (EPFD) limits.

The petition follows a series of reciprocal challenges at the FCC. Previously, Viasat filed petitions seeking to halt SpaceX’s Direct-to-Cell rollout, alleging that non-geostationary mobile satellite operations in shared bands risked degrading regional communications. The ongoing proceedings highlight the structural friction between legacy radio frequency rules established by the International Telecommunication Union (ITU) and the real-time beamforming capabilities deployed by modern LEO megaconstellations, as detailed in SatNews’ review of SpaceX’s administrative filings at the FCC.

Technical Parameters and Equivalent Power Flux-Density Limits

In its technical submission to the FCC’s Space Bureau, SpaceX urged commissioners to apply rigorous interference modeling before granting operational licenses to Viasat’s proposed payload. SpaceX claimed that uncoordinated transmissions in overlapping Ku- and Ka-band frequencies would exceed statutory Equivalent Power Flux-Density (EPFD) thresholds, degrading downlink throughput for ground terminals.

The technical arguments submitted in the filing highlight specific operational parameters:

• Frequency Coordination: SpaceX requested that the FCC condition any authorization on Viasat maintaining strict signal power caps across shared $12/14text{ GHz}$ (Ku-band) and $20/30text{ GHz}$ (Ka-band) frequencies.
• Beam-Steering and Masking: The filing calls for mandatory physical slant-angle masking to prevent Viasat’s spot beams from illuminating active Starlink user terminals during low-elevation passes.
• Interference Cease-Operation Conditions: SpaceX requested that the FCC embed automatic “cease operation” provisions into Viasat’s license, forcing immediate signal mitigation if harmful interference is demonstrated.

Market Rationale and Non-GSO Escalation

The regulatory challenge comes as LEO broadband providers capture market share from legacy geostationary consumer internet services. With SpaceX managing an active constellation of more than 7,000 satellites and expanding its Gen2 footprint, the density of low-Earth orbit signals passing through geostationary orbital arcs has increased substantially.

Incumbent GSO operators maintain that legacy EPFD limits are essential to prevent low-orbit constellations from overpowering geostationary signals directed at fixed Earth stations. Conversely, SpaceX argues that static EPFD caps are outdated, asserting that modern phased-array beamforming and dynamic spatial filtering allow high-density LEO networks to coexist with GSO satellites without causing harmful interference.

FCC Enforcement and Coordination Outlook

The FCC, led by Chairman Brendan Carr, is evaluating the petition alongside broader rulemaking proposals regarding EPFD limits and spectrum-sharing guidelines. The Commission’s decision will determine whether Viasat must modify its technical configuration or accept operational power caps prior to launching its proposed satellite payload.

As commercial operators scale both LEO megaconstellations and high-throughput GSO platforms, the FCC’s ruling will establish important precedents for spectrum coordination, operational power limits, and orbital coexistence across the commercial satellite industry.