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Tham khảo tài liệu 'future aeronautical communications part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 188 Future Aeronautical Communications 2.1 General architecture of a satellite aeronautical communication system In this section the general architecture of a satellite system for providing aeronautical communication services is presented. After presenting the role of the different segments the integration of such systems in the aeronautical telecommunications network ATN specified in International Civil Aviation Organization ICAO 2007 is presented. 2.1.1 Ground space and user segments A typical satellite communication system is divided into three different segments. These are respectively the ground space and user segments. The ground segment is responsible for interfacing the satellite communication system with the rest of the communication network infrastructure to which the satellite system constitutes an access network. Indeed networking infrastructures are structured with a core network to which several access networks interconnect in order to allow end users to connect. In the ground segment of a satellite communication system the information stream that arrives through the ground infrastructure is adapted in order to be sent out on the air interface of the satellite network gateway which in aeronautical communication systems is known as a ground earth station GES . The space segment is composed of the satellite itself the role of the space segment is to either serve as a transparent reflector for the signals sent from the ground or to receive process and re-generate a signal towards the ground in which case the satellite is called regenerative. A regenerative satellite can be used in the case where the equipment on the ground and user segments doesn t use the same modulation and coding rate for example. Another example of regenerative satellites are those used in constellations such as Iridium for which the signal is decoded in the space segment in order for it to be routed towards the appropriate satellite towards its destination. Fig. 1. Satellite system
