Displaying items by tag: Alphasat

Alphasat is a mobile communications service spacecraft in GEO of Inmarsat Plc. of London, UK, referred to as Inmarsat 1-XL. It uses the first next-generation European Alphabus platform and carries in addition to the commercial Inmarsat payloads four hosted TDPs (Technology Demonstration Payloads) of ESA (European Space Agency). The Alphabus/Alphasat project is covered by the ARTES-8 (Advanced Research in Telecommunications Systems) European program. The four hosted payloads on Alphasat I are: ¹⁾

• TDP1: An advanced LCT (Laser Communication Terminal) representing a further development of already existing flight hardware on TerraSAR-X, NFIRE and TanDEM-X. The objective is to demonstrate GEO-LEO ISLs (Intersatellite Links) of high data rate transmissions (optical link at 1064 nm, 1.8 Gbit/s user data rate), complemented with a Ka-band payload developed by Tesat Spacecom (Germany). The payload is funded by DLR.

• TDP5: Two experimental Q/V-band communications transponders to assess the feasibility of these bands for future commercial applications - developed by TAS-I and Space Engineering, Italy.

• TDP6: Demonstration of an advanced Star Tracker with active pixel detector - developed by Jenoptik of Germany.

• TDP8: Demonstration of an environment effects facility to monitor the GEO radiation environment and its effects on electronic components and sensors - developed by Effacec (Portugal).

Alphasat is a European telecommunications satellite designed with the Alphabus platform.

Inmarsat awarded a contract to EADS Astrium Satellites for a first use of the platform Alphabus. The satellite is named Alphasat I-XL, and will augment Inmarsat's Broadband Global Area Network (BGAN) service. The satellite will support a new generation of mobile technologies and enable communications across Europe, Asia, Africa and the Middle East.

It was launched on 25 July 2013. At launch date it was one of the biggest geostationary telecom satellites.