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  • Satellite Evolution Group

Inmarsat to launch I-8 satellites to power L-band network

The satellite operator has announced its new Inmarsat-8 small satellites will launch in 2026 to provide crucial safety services and support advances in emergency tracking.

Inmarsat, a world leader in global, mobile satellite communications, has announced that SWISSto12, one of Europe’s fastest-growing aerospace providers, will develop its new eighth-generation of spacecraft. The three I-8 satellites will provide additional network resilience, securing the future of Inmarsat’s global L-band safety services.


Swissto12, headquartered in Switzerland, will use its HummingSat satellite platform - in conjunction with unique 3D-printing technologies and specialised Radio-Frequency (RF) and payload products - to develop and manufacture the geostationary satellites, which will launch by 2026.

Just 1.5 cubic metres in volume, the I-8’s will use SWISSto12’s innovative new class of spacecraft which has a form factor up to five times smaller than conventional geostationary satellites yet can still deliver critical safety services with certainty.


The three l-8 satellites will continue to provide the extra layer of resilience to complement the existing constellation and Inmarsat’s two I-6 generation satellites, which were launched in December 2021 and February 2023. In March 2023, Inmarsat announced the first, I-6 F1, had successfully completed testing with ground stations in Western Australia and has now started to provide Ka-band services for the fast-growing Asia Pacific region. The company will begin introducing its L-band capacity and transitioning services to the new satellite throughout 2023.

The second, I-6 F2, which launched in February 2023, is expected to enter operational service over Europe, Africa, and much of the Americas in early 2024.


Each I-8 will also extend Inmarsat’s history of launching and operating radio navigation transponders for Governments and international space agencies. These transponders can enable Satellite-Based Augmentation System (SBAS) services around the world, for example for air traffic controllers or coastguards. SBAS systems use satellite connectivity, land-based infrastructure, and software to enhance standard GPS/Galileo accuracy of 5 to 10 metres to as little as just 10cm.

Such precise tracking could enable pinpoint safety navigation on aircraft, help emergency services reach vessels in distress more quickly, or allow a raft of industrial innovations, like device tracking in agriculture or advanced, automated transport management systems.


The I-8 satellites will continue to secure Inmarsat’s global safety services into the 2040s. The company was founded in 1979 under the auspices of the United Nations specifically to provide highly reliable safety communications. Today some 1.6 million seafarers and over 200 airlines rely on Inmarsat’s global L-band network to deliver 99.9% availability every day.


The Inmarsat-8 programme forms part of Inmarsat’s fully-funded technology roadmap, which will include five new satellite payloads added by 2025 to further Inmarsat’s high-speed broadband Global Xpress (GX) network with the launch of the software-defined satellites GX 7,8, and 9, aimed for 2025, and the polar coverage satellites GX10a and b, which are aimed for the first half of 2024.

Peter Hadinger, Chief Technology Officer, Inmarsat, said “Every single day people around the world depend on Inmarsat services. Our customers have demanding, and often safety-critical, missions that rely on our satellite technology for links that can make the difference. The I-8’s will not only underpin our existing capabilities for the future, but enable ever more advanced safety innovations like SBAS that can ultimately help save more lives. We have chosen SWISSto12 because they have the ground-breaking technology that can make it a reality.”


Emile de Rijk, CEO, SWISSto12, said “We are delighted that Inmarsat has selected SWISSto12 as its partner for its landmark l-8 program. It demonstrates that, with HummingSat, we have created a highly-advanced new class of small geostationary spacecraft that delivers world-leading connectivity capabilities at a fraction of the cost. Our proprietary 3D printing of Radio Frequency payload technology allows us to push the limits of existing capability and service new and existing business cases for geostationary satellite communications. This is an important step in our journey to better connect and protect every corner of the world.”


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