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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 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.

A variant of the GMP-T platform is in manufacture 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
  • 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 spare space of a primary mission.



Adaptor upper stage flight opportunity

A novel satellite platform designed to utilise the unused launch vehicle capacity, while providing state-of-the-art approaches to manufacturing and propulsion.  


LEO telecommunications Platforms

SSTL's X3 series of next generation LEO platforms for telecom constellations