How Europe's tenth Galileo satellite marked a major milestone for orbital navigation
In short: On 11 September 2015, a Soyuz launch from French Guiana propelled two critical satellites into orbit. This mission brought the Galileo constellation to one-third completion, signaling that Europe's independent navigation system was rapidly gathering pace toward full global operational capability.
The launch of Galileo 9 and 10 represented a pivotal moment for the European Union's navigation infrastructure. Departing from Europe's spaceport in Kourou, these satellites were released into a target orbit at an altitude of approximately 23,500 km by the Fregat upper stage. This deployment occurred roughly 3 hours and 48 minutes after liftoff, marking a significant step in the partnership between the European Commission and the European Space Agency (ESA). The mission successfully utilized the Fregat upper stage to achieve the desired orbital placement. This specific deployment was a key component of the broader European strategy to establish a reliable, independent positioning service.
The manufacturing and testing of these units involved a complex, pan-European supply chain. While OHB in Bremen, Germany, manufactured the satellites, the navigation payloads were provided by Surrey Satellite Technology Ltd in the UK. These components were subjected to rigorous testing at ESA’s ESTEC technical centre in Noordwijk, Netherlands, to ensure they met the high standards required for global navigation services. Furthermore, the project benefited from the expertise of various European entities to ensure technical precision. This collaborative effort highlights the integrated nature of the continent's space-based infrastructure.
As the constellation expanded, the technical focus shifted toward long-term continuity. ESA and the European Commission worked to ensure the system could provide services indefinitely, aiming for performance parity with existing global satellite navigation systems. Looking forward from 2015, the deployment strategy included the use of a customized Ariane 5 launcher, designed to increase launch efficiency by doubling the satellite capacity per mission from two to four. The upcoming introduction of a modified Ariane 5 rocket was expected to significantly enhance deployment efficiency. This upgrade would allow for up to four satellites to be placed into orbit during a single flight.
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Sources
- Summary by Intellect · source: Galileo satellites 9 and 10
- Also: Galileo taking flight: ten satellites now in orbit
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