What is the ground segment?
The ground segment encompasses all terrestrial facilities and equipment required to operate a satellite system: telemetry, tracking and command (TT&C) stations that monitor and control the spacecraft; gateway or hub stations that process user traffic; network operations centres (NOC) that manage the overall network; mission control facilities for complex manoeuvres; and the terrestrial fibre, microwave, and internet infrastructure interconnecting these facilities. For a LEO broadband constellation, the ground segment includes hundreds of gateway sites distributed globally.
Key facilities
TT&C stations: Typically operate in S-band and connect to the satellite operations centre (SOC) via encrypted links. A global operator maintains TT&C sites at multiple latitudes to maintain contact with its satellite throughout each orbit. Gateway stations: Handle user traffic in bulk — connecting satellite spot beams to terrestrial internet exchange points (IXPs) or private network backbones via fibre. Network Operations Centre (NOC): Monitors real-time network performance, manages capacity allocation, responds to faults, and coordinates maintenance windows. For LEO mega-constellations like Starlink, the NOC manages automated systems that adjust beam patterns, frequency plans, and routing across thousands of satellites simultaneously.
Ground segment cost
The ground segment represents a significant fraction of total system cost — often 20–40% of total lifecycle cost for LEO constellations. For HTS GEO satellites, the requirement for dozens of geographically distributed gateway sites creates substantial real estate, antenna, and terrestrial connectivity costs. Ground-as-a-Service providers (AWS Ground Station, KSAT, Leaf Space) offer on-demand access to existing ground station networks, allowing satellite operators to avoid building proprietary ground infrastructure.