A practical breakdown for CubeSat and SmallSat mission teams

Ground stations are not footnotes in your FCC authorization. They are licensed components of the system — and in 2026, the Space Bureau is scrutinizing ground segment disclosures with the same rigor it applies to space segment filings. Yet many CubeSat and SmallSat operators treat ground infrastructure as an afterthought, assuming their space-side authorization covers it. That assumption is expensive.

This post explains exactly what FCC ground station licensing requires, how earth station authorizations interact with your satellite license, and where operators most commonly create compliance exposure through incomplete or outdated ground segment disclosures.

Why Ground Stations Are Part of Your Licensed System

Under Part 100 of the FCC’s rules — which replaced the legacy Part 25 framework for non-geostationary satellite systems — the satellite authorization encompasses the entire communications system, including the ground infrastructure used to command, control, and communicate with the spacecraft.

The FCC’s Space Bureau evaluates ground segment disclosures as part of its assessment of whether a proposed satellite system will operate within its licensed parameters. This means the location, frequency use, and operational control characteristics of your ground stations are all regulatory variables, not just operational ones.

Key principle: your FCC authorization is a system license, not just a satellite license

In practice, this means:

• All earth stations used for telemetry, tracking, and command (TT&C) must be identified in your filing.
• Ground stations operated by third parties on your behalf — including commercial ground network providers — must be disclosed and their FCC authorization status confirmed.
• Frequencies used at ground stations must align with the spectrum authorizations in your space station filing.
• Any change to the ground segment that alters the interference scenario or operating parameters may trigger an amendment obligation.

Part 100 and Earth Station Authorizations: The Basics

Most CubeSat and SmallSat operators are familiar with the space station licensing requirements under Part 100. Fewer are fluent in how the earth station side of the framework operates. To dive in deeper on Part 100, continue reading on FCC Part 100 Explained: A Practical Guide for Small Satellite Operators.

Under the FCC’s rules, earth stations may be licensed in one of three ways, depending on the service type and operational context:

1. Individually licensed earth stations — required for gateways, primary TT&C facilities, and any ground station transmitting in frequency bands that require individual coordination.
2. Blanket-licensed earth stations — available for certain operational configurations, particularly where multiple terminals operate under common technical parameters.
3. Ancillary earth station authorizations under your space station license — in some cases, the FCC may authorize limited ground operations as part of the broader satellite system authorization, subject to conditions.

For most CubeSat missions, the primary concern is ensuring that the TT&C earth station(s) — whether operated in-house, at a university, or through a commercial provider — are properly authorized and that their authorization is referenced or incorporated into the overall system filing.

The existing Ground Stations, TT&C, and FCC Compliance guide on this site provides the foundational framework. This post builds on that by walking through the specific authorization scenarios that arise most often in CubeSat missions.

Disclosure Requirements: What You Must Tell the FCC

Operators are required to disclose all ground facilities used for command and control. The FCC’s review of your application will include assessment of whether these disclosures are complete, accurate, and consistent with the technical characteristics of the proposed system.

At minimum, your filing should address:

• Physical location: Ground station location(s) (geographic coordinates)
• ITU consistency: ITU notification data for any earth stations that require international coordination
• Frequency alignment: Frequencies and power levels at each facility, consistent with the space station authorization
• Third-party disclosure: Identification of any third-party ground network providers and confirmation of their FCC authorization status
• Contingency stations: Contingency or backup facilities, particularly if they operate on different frequencies or from different locations

One frequently missed requirement: changes to ground infrastructure after the initial authorization must be evaluated for amendment triggers. If you switch ground station providers, add a geographic location outside the originally authorized coverage, or alter frequency use, you may be required to file an amendment under Part 100 before making the change operationally.

The post on FCC Licensing Timelines in 2026 covers what these amendment review periods typically look like and why operators should plan for them early. Further reading in FCC Licensing Timelines in 2026: What CubeSat and SmallSat Operators Should Realistically Expect.

The TT&C Authorization Problem

Telemetry, tracking, and command operations sit at the compliance intersection of space segment and ground segment regulation. The FCC expects your TT&C architecture to be clearly articulated in your filing — including the frequencies used for uplink commands and downlink telemetry, the earth station(s) from which TT&C operations are conducted, and the technical safeguards that prevent unauthorized command access.

Where operators routinely create exposure:

• Using a university or shared facility for TT&C without confirming whether the facility is independently authorized by the FCC.
• Operating from multiple TT&C locations for redundancy without disclosing all locations in the original filing.
• Failing to update the authorization when a commercial ground station service provider (AWS Ground Station, Leaf Space, etc.) is added post-launch.

The last point is increasingly common as operators scale. Adding a commercial ground network provider is often an operationally minor decision — but from the FCC’s perspective, it introduces new facilities, new potential interference sources, and new authorization relationships that may not have been part of the original system analysis.

Spectrum Sharing and Interference: Why Ground Station Locations Matter

The interference analysis in your FCC filing assumes a specific ground station configuration. When you add facilities in new geographic areas, you may be introducing interference scenarios that were not modeled in your original authorization.

This matters practically in several ways:

• A ground station added in a dense urban or industrial area may face different terrestrial interference than your original facility — which can affect TT&C reliability and may require coordination with incumbent users.
• Earth stations in certain frequency bands are subject to coordination requirements with other licensed users, and adding a new facility may trigger those obligations even if your space station license already covers the frequencies.
• Operating from an unlicensed or insufficiently authorized ground facility creates enforcement exposure regardless of whether interference actually occurs.

The post on When Spectrum Sharing Fails: Case Studies in Ground Segment Interference (Post 2 in this series) covers specific interference scenarios operators encounter and how they typically escalate.

Action Steps for Mission Teams

Ground segment compliance does not require a specialist regulatory team — it requires accurate documentation and a system for tracking changes. Here is a practical starting point:

1. Inventory every ground station currently used for TT&C, mission data downlink, or contingency command. Confirm the FCC authorization status of each.
2. Review your existing FCC filing to ensure all current ground facilities are disclosed and consistent with the technical parameters described.
3. Establish a change management process that routes ground segment changes through a compliance check before implementation.
4. If you use commercial ground network providers, request confirmation of their FCC authorization and keep that documentation on file.
5. Set a calendar reminder to review ground segment disclosures at each significant mission phase — not just at launch.

Further reading on ground stations, TT&C and FCC compliance can be found in Ground Stations, TT&C, and FCC Compliance for Small Satellite Missions.