The ARTES 4 initiative is aimed at supporting close to market developments within industry. Developments within this ARTES 4 project are part of the wider GMP development programme at SSTL that is applying the Company's low-cost, rapid-schedule approaches to the GEO (Geostationary Earth Orbit) market. GMP is targeted on a platform designed for a 10-year mission life and capable of supporting a 200kg, 2.5kW power payload.

The design review was successfully completed with no outstanding actions and SSTL received very encouraging feedback from ESA. The review followed an accelerated study phase in which the baseline design of the "transfer orbit" variant of the GMP was defined and marked the end of Phase 1 of the project. Phase 2 will look in more detail at aspects of the structural, thermal and propulsion subsystem designs.

Group Executive Chairman, Professor Sir Martin Sweeting, is confident that the economics of space could be changed by rethinking the approach to geostationary satellite design. "We are determined to offer the industry's shortest order-to-orbit timescales for geostationary platforms. At the current rate of technology development in communications, operators want to see their payloads in orbit as soon as possible", said Sir Martin.

SSTL sees the ESA contract as a valuable opportunity to progress its on-going Geostationary Minisatellite Platform (GMP) work, which started under the British National Space Centre's MOSAIC programme. Work completed under MOSAIC (MicrO Satellite Applications In Collaboration) enabled SSTL to develop GIOVE-A for ESA, the first satellite of the Galileo navigation constellation. At an orbital height of over 23,000 km, GIOVE-A also constituted a successful first move "beyond LEO" for the company.

SSTL's Dr Kathryn O'Donnell is confident that the GMP developments provide new possibilities: "The move from LEO and even MEO to geostationary orbits demanded a rethink rather than a simple scaling-up of existing technologies. Our team of engineers, the majority of whom have significant experience on GEO telecommunications missions, have taken a top-down approach to the GMP design. This promises a dramatic reduction in project timescales whilst incorporating proven SSTL heritage designs and processes."

The move from LEO to MEO orbits and out to GEO is not without its challenges. Key differences will arise: the structural design must support much more weight and a larger payload, the thermal design must address the heat dissipation from potentially power-intensive communications payloads and the propulsion system must be capable of transferring the spacecraft from Geostationary Transfer Orbit (GTO) to GEO for this transfer variant of the GMP. The focus of Phase 2 of the ARTES 4 project is to address the developments required in these areas.

Surrey Satellite Technology Ltd (SSTL) develops innovative technologies to change the economics of space, delivering cost effective satellite missions within rapid timescales. The Company is a world leader in the design, manufacture and operation of high performance small satellites with experience gained over more than 25 years and 27 missions launched.

SSTL employs 250 staff working on LEO, GEO and interplanetary missions, turnkey satellite platforms and space-proven satellite subsystems and optical systems. The Company also provides know-how transfer and training programmes and consultancy services, and performs studies for ESA, NASA and commercial customers related to platform design, mission analysis and planning.

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