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SSTL are the small satellite constellation experts.  Small satellite constellations are financially viable, enable rapid revisit and provide flexibility for replenishing space assets for data continuity. 

The DMC3/TripleSat Constellation

Designed and built by SSTL and launched in 2015, the DMC3/Triplesat Constellation provides daily revisit times which is crucial for change detection, disaster monitoring and response planning, and essential for acquiring cloud-free imagery.  Beijing-based company, 21AT,have leased 100% of the imaging capacity of the three satellites.

More about the DMC3 Constellation


The FORMOSAT-7 Constellation

SSTL is supplying 6 satellite platforms to NOAA/Taiwan for the FORMOSAT-7 weather forecasting constellation.

More about the FORMOSAT-7 Constellation


The Galileo GNSS Constellation

SSTL teamed with OHB System of Bremen, Germany for the provision of the first 30 satellites in the full operational capability phase of the programme.  Within the team, OHB take the role of prime contractor and builder of the spacecraft platform and SSTL take full responsibility for the navigation payloads onboard the satellite that will form the heart of the navigation system.

SSTL's payload solution is based on European sourced atomic clocks, signal generators, high power TWTAs and antennas. Each payload will be formed of a number of subsystems that will combine to generate the navigation messages broadcast by the satellites directly to a user's receiver. 

More about SSTL's Galileo FOC Navigation Payload

NASA CYGNSS Constellation

The Cyclone Global Navigation Satellite System (CYGNSS) program is part of the NASA Earth System Science Pathfinder program and aims to improve extreme weather prediction. The intent of the CYGNSS program is to study how tropical cyclones form in order to advance forecasting and tracking methods.

The CYGNSS space segment will implement a constellation of eight micro-satellites carried to orbit on a single launch vehicle in 2016. The on-orbit CYGNSS observatory payloads are the Delay Doppler Mapping Instrument (DDMI) which are used to collect ocean surface roughness data via GPS Reflectometry, from which wind speed will be derived. The CYGNSS DDMI is SSTL's SGR-ReSI which we will design, manufacture, test, and deliver.  We will also support the SGR-ReSI/DDMI integration into the observatories.


The RapidEye Constellation

5 RapidEye platforms in SSTL's cleanroom

SSTL supplied the platforms for the 5-satellite RapidEye constellation which launched in 2008. RapidEye is a commercial small satellite mission developed by MacDonald Dettwiler & Associates (MDA). The constellation is now owned and operated by BlackBridge.  This unique system enables unprecedented global monitoring of the Earth’s surface. The mission provides rapid delivery of land information products and services to the agricultural industry for crop monitoring and mapping, yield predictions and natural disaster assessment.

The constellation provides:

Daily revisit
Multispectral imagery
6.5m GSD resolution 

The Disaster Monitoring Constellation

SSTL conceived the innovative and unique Disaster Monitoring Constellation (DMC), the first Earth observation constellation of low cost small satellites providing daily images for applications including global disaster monitoring.

The Disaster Monitoring Constellation is coordinated by DMC International Imaging Ltd (DMCii)  for both commercial imaging programmes and to provide free satellite imagery for humanitarian use in the event of major international disasters within the International Charter: Space & Major Disasters ( 

The DMC is represented by the UK Space Agency on the Charter board and DMCii in the executive secretariat. The national civil protection authorities of Algeria, China, Nigeria, Turkey and UK are direct authorised users of the Charter.

More about the DMC Constellation