排序方式: 共有4条查询结果,搜索用时 15 毫秒
1
1.
1983—1984年中国和意大利进行天狼星(SIRlO-1)卫星联合实验,本文报导北京地球站所进行的电波传播实验的主要结果。其中包括:11.5GHz下行雨致衰减、17.1GHz/11.5GHz上下行雨致衰减的相关关系,衰减变化率,微波辐射计和信号闪烁等。所获得的结果对我国发展Ku波段通讯或广播卫星系统有参考意义。 相似文献
2.
3.
Paraboni A. Capsoni C. Bosisio A. Ferrari M. Matricciani E. Ruggieri M. Salome A. Bonifazi C. 《IEEE transactions on aerospace and electronic systems》2002,38(4):1388-1397
The resource sharing experiment (RSE) of the DAVID (DAta and Video Interactive Distribution) multiexperiment mission of the Italian Space Agency (ASI) is described. The experiment envisages adaptively varying the robustness of signals down-transmitted, to a set (16) of Earth terminals by acting on their coding and spreading. During the DAVID satellite passes, each terminal determines autonomously its signal-to-noise ratio (SNR) and transmits it to a central station which, by using this information, works out the parameters for the global system optimization and indicates, in real time, to the terminals which code and despreading factor they must utilize to receive the part of the signal addressed to them. 相似文献
4.
Bonefazi C. Ruggieri M. Paraboni A. 《IEEE transactions on aerospace and electronic systems》2002,38(4):1371-1376
The DAta and Video Interactive Distribution (DAVID) mission belongs to the Small Missions for Science and Technology Programme of the Italian Space Agency (ASI) and is aimed at pioneering the use of the W-band channel for telecommunications experiments. Furthermore, it envisages the test of a novel technique, for an optimal sharing of the satellite resources, among a grid of Earth terminals, that could be usefully exploited in future W-band operational systems. 相似文献
1