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EUTELSAT multimedia satellites

机译：EUTELSAT多媒体卫星

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Multimedia spacecraft typically are required to have a high G/T and a high EIRP, at least for communications with user terminals on both the uplink and downlink, to allow for small and low cost user terminals on ground. This explains why the future of multimedia satellites will probably take place at Ka- band. On-Board Processing is widely considered for this type of spacecraft in order to efficiently use satellite power and to meet connectivity requirements. It is relatively easy to meet the RF and connectivity requirements if the system includes a single beam on the downlink or on the uplink. As the cov- erage is enlarged, the RF requirements 4re met by limiting the size of each spot and consequently, a multi-spot system is required to cover the full service area. However, meeting the connectivity requirement becomes more complicated. With Skyplex, EUTELSAT became the pioneer for the commercial exploitation of On--Board Processing (OBP). From Hot Bird~TM 4 to Hot Bird~TM 6, the evolution of EUTELSAT's Skyplex OBP units has shown a constant im- provement in flexibility, number of channels processed and link budget gain. The future of OBPs for multimedia appli- cations could go through the utilisation of standards like the DVB-RCS and DVB-S (Direct Video Broadcast -- Satellites), respectively for uplink and downlink, that now offer the sys- tem designer a tool box to design a system compatible with standard user terminals, and the achievement of connectivity requirements.
机译：多媒体航天器通常至少在上行链路和下行链路上都需要具有高G / T和高EIRP，以便与地面上的小型和低成本用户终端进行通信。这就解释了为什么多媒体卫星的未来可能会发生在Kaband。为了有效利用卫星功率并满足连接性要求，这种航天器被广泛考虑了机载处理。如果系统在下行链路或上行链路上包含单个波束，则相对容易满足RF和连接性要求。随着覆盖范围的扩大，通过限制每个光斑的大小可以满足RF要求4，因此，需要一个多光斑系统来覆盖整个服务区域。但是，满足连接性要求变得更加复杂。有了Skyplex，EUTELSAT成为车载处理（OBP）商业开发的先驱。从Hot BirdTM 4到Hot BirdTM 6，EUTELSAT的Skyplex OBP装置的发展显示出灵活性，处理通道数和链路预算收益的不断提高。用于多媒体应用的OBP的未来可能会通过分别利用DVB-RCS和DVB-S（直接视频广播-卫星）标准分别用于上行链路和下行链路来实现，这些现在为系统设计人员提供了一种工具。盒设计与标准用户终端兼容的系统，并达到连接要求。

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