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Satellite internet and GPS do not simply use one shared frequency. They operate under allocations and technical rules for particular radio bands and services. Those rules can coordinate systems using the same band or limit emissions that might spill into a neighboring band. They reduce interference risk; they cannot guarantee that interference will never occur.

What does “sharing spectrum” mean?

Radio spectrum is finite, so national regulators and international bodies allocate frequency bands to radio services and set conditions for their use. Satellite broadband transmissions use satellite-service bands; GPS is a use of the radionavigation-satellite service (RNSS). The exact rules depend on the band, the direction and location of transmissions, which services already use the band, and the jurisdiction.

“Sharing” can describe two different situations. Systems may be authorized to operate in the same band under defined priorities and coordination rules, or one service may be required to limit emissions so it does not disrupt receivers in an adjacent band. Neither arrangement means every system can transmit freely across the spectrum.

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Arrangement What is being managed Typical protections
Same-band sharing Multiple authorized services use some or all of the same frequencies. Service priority, coordination, and limits such as power-flux-density (PFD) or equivalent power-flux-density (EPFD) requirements.
Adjacent-band protection A transmitter in one band could affect a receiver tuned to a nearby band. Emission limits and receiver-level compatibility testing to establish what nearby-band signals receivers can tolerate.

To compare two sharing arrangements, ask which services and bands are involved, whether they are co-primary or one is unprotected, where and in what direction they transmit, what technical limits apply, how coordination or disputes work, and which jurisdiction and effective date govern them.

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How are GPS receivers protected from nearby signals?

GPS signals use spectrum reserved for radio navigation. A nearby-band transmitter is not necessarily using GPS frequencies, but strong emissions near a GPS band can still affect a sensitive receiver. That is an adjacent-band compatibility problem, distinct from intentional jamming, in which a signal is deliberately used to disrupt reception.

GPS.gov says: “The U.S. government works to minimize human sources of GPS interference through spectrum regulations (domestic and international), interference detection and mitigation efforts, and law enforcement.” These measures reduce risk and provide ways to detect, address, and enforce against interference; they do not make interference impossible.

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What the U.S. compatibility assessment established

The U.S. Department of Transportation released its final GPS Adjacent Band Compatibility Assessment in April 2018. A related gap analysis reviewed five test efforts and concluded that results from three were sufficient and appropriate to inform policymakers about major impacts of a proposed LTE network on GPS receivers. The testing helped identify power levels GPS/GNSS receivers can tolerate from adjacent-band interference sources.

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This is evidence for receiver-focused testing and adjacent-band protection, not a field test of satellite internet systems. It should not be read as proof that a particular broadband satellite network was tested against GPS.

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What does a current U.S. satellite-sharing rule look like?

FCC Report and Order 24-70 provides a specific example of band- and service-specific rules. As summarized in the Federal Register on December 5, 2024, and effective January 6, 2025, it permits non-geostationary fixed-satellite-service (NGSO FSS) downlinks in 17.3–17.8 GHz in the United States.

U.S. band segment Sharing status described in FCC 24-70 Protection condition
17.3–17.7 GHz NGSO FSS operates co-primary with specified incumbent services and geostationary-orbit (GSO) services. The order applies ITU EPFD limits and PFD limits across the band to protect incumbent operations.
17.7–17.8 GHz NGSO FSS is co-primary with GSO FSS, but unprotected relative to terrestrial fixed service. The same order’s band-wide EPFD and PFD limits apply; the unprotected status means NGSO FSS cannot claim protection from terrestrial fixed service in this segment.

FCC 24-70 also cites 1,300 MHz of contiguous spectrum for NGSO FSS downlink operations. That is a regulatory figure for the U.S. framework described by the FCC, not a claim that the specific 17.3–17.8 GHz segment alone spans 1,300 MHz or that every country provides the same spectrum.

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Coordination is not a substitute for technical rules

The FCC’s broader GSO/NGSO sharing framework illustrates how coordination and binding limits can work together. The U.S. Government Accountability Office describes a revised framework that expanded good-faith coordination, allowed voluntary private agreements on interference protections, and retained technical backstops when coordination does not succeed. The framework also relied on NGSO compliance with EPFD limits developed in the late 1990s. Operator agreements can help resolve sharing issues, but they do not replace all regulatory limits.

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How do international rules fit in?

International technical recommendations address particular service pairings and bands; they are not universal rules for every satellite broadband or GPS coexistence question. For example, ITU Recommendation F.1249-5, approved January 30, 2018 and listed as in force by the ITU, addresses technical and operational requirements for sharing between point-to-point fixed-service systems and the inter-satellite service in 25.25–27.5 GHz.

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That recommendation illustrates the specificity of sharing rules: it concerns named services in a defined band. It does not describe GPS protection generally, nor does it establish a single worldwide frequency plan for satellite internet.

What can readers conclude about interference?

Allocation answers which services may use a band; compatibility rules and coordination address how they can operate without causing unacceptable interference. For GPS, nearby-band emissions matter because receivers can be sensitive even when a transmitter is not assigned to GPS frequencies. For satellite services, co-primary status, unprotected status, emission limits, and coordination obligations determine what protections apply in a given band and place.

There is no single provider-by-provider global list of current satellite broadband frequencies established by the cited material, and the U.S. 17 GHz example should not be generalized to all operators or countries. The practical answer is therefore specific to the band, service, receiver, and regulator involved.

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