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GEO Platforms

SSTL's Telecommunication and Navigation products have been designed to fill the market requirement for cost-effective, rapid response small geostationary spacecraft providing solutions for telecommunications, frequency filing protection, service start-up, capacity augmentation, and technology demonstration.

Our product range can offer a wide range of mission solutions, including:


  • Ku and C/Ku Band
  • Mobile and Military Comms
  • Ka Band

Our platform designs deliver low CAPEX, low cost launch, and low cost operation.

We can also offer Know-How Transfer and Training programmes, with a mix of hands-on training and academic training.  




Transfer variant

Compatible with a wide range of launch vehicles:

  • Ariane 5
  • Zenit
  • Falcon 9
  • Soyuz
  • Proton

SSTL has developed the GMP-T platform with a Central Thrust Tube and modular propulsion tanks (700, 760, 815 or 863 litre).

The platform has been designed to maximise capacity and performance and accommodates either industry standard or custom-built payloads, including flexible antenna accommodation.

The GMP-T platform is currently in manufacture at SSTL for the Eutelsat Quantum telecommunications spacecraft.

Key Platform Characteristics  

Design life

up to 15 years*

Payload power available

Up to 5kW (7KW)

Payload mass accommodation

Up to 450kg (700kg)

Delivery schedule (recurrent)

24-28 months**

Flexible antenna accommodation  

Top deck of 2m by 1.7m
Deployed up to 2.6m diameter - F/D of 1.2

* Plus 1 year for launch insurance purposes
** On ground delivery: schedule affected by payload delivery schedule

SSTL GMP-T Stacked

Key Platform Characteristics

Design life

up to 15 years*

Payload power available

Up to 3.2kW

Payload mass accommodation

Up to 200kg

Wet mass


Stacked wet 

 * Plus 1 year for launch insurance purposes






Externally load bearing structure
  • Tremendous saving of launch cost due to compact size.
  • Scalable solution that covers a range of power options.
  • Choice of mission solution, without the need of extensive qualification campaign or significant NRE.
  • Compatible with single stack or dispenser configuration.
  • The structure can be launched using the spare space on a primary mission launch.





Adaptor upper stage flight opportunity

A new affordable and reliable opportunity to deliver payloads to GEO orbit.

GMP-A is an innovative satellite platform that optimises the unexploited spare capacity inside the adapter cone of the launch vehicle, under the primary payload.

GMP-A is designed to fit neatly inside the restricted space available, and has no impact on the primary payload or the fairing design.  Once launched, it deploys antennae and solar panels and utilises electric propulsion to complete the journey to GEO orbit, where it re-configures the antennae and solar panel orientations for start of operations.