Space systems and satellite services
Space systems and satellite services provide positioning, timing, communication and observation from orbit. Many terrestrial systems depend on them, making their disruption a cross-sector risk. Space and Earth Observation stewards this page for the Nexus Consortium.
- 01In briefThe short answer
- 02The methodWhat space systems and satellite services covers
- 03Reference practiceSpace operations follow UN guidelines and coordination bodies
- 04In systemic risk workSatellites as critical infrastructure
- 05Applied inPlatforms that apply this method
- 06StewardshipWho maintains this page
- 07Key termsTerms used on this page
GCRI · Institution · service level R0
The short answer.
Space systems and satellite services provide positioning, timing, communication and observation from orbit. Space systems analysis reveals dependencies of finance, power grids and transport on satellite timing and navigation. In the Nexus Consortium, Space and Earth Observation stewards its canonical page, and 2 other platforms apply it, including Climate and Hazards as well as Critical Infrastructure.
Land surface in Chile.
Surface classes an Earth-observation programme reads: ranges, deserts, glaciers, lakes and reefs, shown for Chile as an example geography for this subject.
What space systems and satellite services covers.
- 01
Core methods
orbit determination; space situational awareness; link budget analysis; space weather impact assessment; mission reliability analysis; ground segment design.
- 02
Data and instruments
satellite telemetry; space object catalogues; space weather monitors; ground station records; timing and positioning signal monitors.
- 03
Validation
Systems are tested on the ground before launch and monitored in orbit. Conjunction assessments and service performance are checked against independent tracking.
- 04
Limits
Debris growth, solar storms and interference are hard to forecast precisely. Ground segments and launch capacity are concentrated.
- 05
Use in risk decisions
Space systems analysis reveals dependencies of finance, power grids and transport on satellite timing and navigation. It supports planning for backups and space weather events.
Space operations follow UN guidelines and coordination bodies.
| Reference | What it sets |
|---|---|
| COPUOS guidelines for the long-term sustainability of outer space activities | Debris, space weather and operations |
| International Charter Space and Major Disasters | Emergency data provision |
| ITU radio regulations | Spectrum and orbit coordination |
Satellites as critical infrastructure.
Navigation, timing, communications and observation satellites support finance, power, transport and warnings. Space weather, debris and ground segment failures are risks to all of these simultaneously. Analysis maps which services depend on which constellations and what backup exists.
- Map dependence on satellite timing and navigation.
- Consider space weather as a common-mode hazard.
- Assess ground segment single points of failure.
- Applications on Space and Earth Observation and Critical Infrastructure.
Platforms that apply this method.
Who maintains this page.
Space and Earth Observation stewards space systems and satellite services: it keeps this description current and reviews how the method is applied across the platforms.
Terms used on this page.
Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.
| Term | Definition |
|---|---|
| Observing system | The combination of instruments and platforms that systematically measures a variable. |
| Mission continuity | The planned succession of satellites so that a record continues without gaps. |
| GNSS | Global navigation satellite systems, such as GPS and Galileo, that provide positioning and timing. |
| Holdover | The period a clock can keep accurate time after losing its external timing reference. |
Where this page's references lead.
The bodies and documents this page is read against. Status and editions change; each link goes to the issuing body.
Questions and answers.
Why does one institution host every method page?
How do I suggest a correction to a method page?
Around GCRI.
Start with an enquiry.
The current service level is R0: information and enquiries. An enquiry receives a reference and names the next step; applications, payments, compute allocations and registrations open only when their team, terms and review capacity exist.