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The Alphasat satellite was launched on 25 July 2013. The Aldo Paraboni technology demonstration payload, funded by ASI under ESA's ARTES Programme, was embarked as an hosted payload on Alphasat. This Technology Demonstration Payload (identified as TDP5 and recently renamed Aldo Paraboni) was implemented under an ESA contract awarded in co-contractorship to Space Engineering and Thales Alenia Space Italia (TAS-I) which conceived the experimental mission and industrialised the subsystems. The Aldo mission is composed of two main elements: a Communication Experiment mission, which aims at assessing the performance of communication links at Q/V Bands; and a Scientific Experiment mission implemented through two beacons at Ka and Q Bands, which aims at characterizing propagation phenomena at these frequencies. During the In Orbit Test campaign of the above two mission components, TDP5 demonstrated compliance to the requirements and the nominal conditions of the Payload. The main topics of this paper are the description of the In Orbit Test requirements and the discussion of tests results. The good health of the Payload is demonstrated by the agreement of the results with the predictions that were calculated on the basis of the results of the on ground test campaign. The Commissioning and IOT campaign of Aldo Paraboni was performed over 3 distinct sessions: • Commissioning: 17-18 September 2013 • IOT Part 1: 10-18 October 2013 • IOT Part 2: 4-8 November 2013 This work is only related to the verification of the performance of the space segment, the Q/V-Band Payload, also referred to as the TDP5. TDP5 stands for Technical Demonstrator Payload #5 and it is formally the 5th experimental (i.e. technological demonstrator) hosted payload of the Alphasat programme

Summary Since the 1970s, satellite communications have been continuously evolving and improving to provide services characterized by increasing complexity and quality. This evolution has been supported by the constant increase in the operating frequency for achieving the necessary high data rates. This contribution focuses on the long‐term key role of the Italian Space Agency in supporting research activities on (and the developments of) high‐frequency satellite communication systems. The Alphasat experiment is the most recent effort of the Italian Space Agency, in collaboration with the European Space Agency, to thoroughly investigate the severe detrimental atmospheric effects impairing radio waves at high frequency (specifically, Ka and Q bands) and the associated fade mitigation techniques (eg, uplink power control, site diversity, and adaptive coding and modulation) required to achieve the typical target quality and availability of modern satellite communication systems.

Badges All delegates will receive a badge and tickets for the booked events. Participants are kindly requested to wear their badges throughout the conference, even at the social events. The replacement of lost or forgotten badges carries a € 25 charge. In order to facilitate the duplication of the badge, please present a copy of your registration confi rmation as proof. Cloakroom A cloakroom is located on the ground fl oor of the Prague Congress Centre. Offi cial Language All sessions will be held in English only. No translation will be provided.

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