| タイトル | Geostationary payload concepts for personal satellite communications |
| 本文（外部サイト） | http://hdl.handle.net/2060/19940018292 |
| 著者（英） | Stojkovic, I.; Rinous, P.; Benedicto, J.; Roederer, A.; Roberts, I. |
| 著者所属（英） | European Space Agency. European Space Research and Technology Center |
| 発行日 | 1993-01-01 |
| 言語 | eng |
| 内容記述 | This paper reviews candidate satellite payload architectures for systems providing world-wide communication services to mobile users equipped with hand-held terminals based on large geostationary satellites. There are a number of problems related to the payload architecture, on-board routing and beamforming, and the design of the S-band Tx and L-band Rx antenna and front ends. A number of solutions are outlined, based on trade-offs with respect to the most significant performance parameters such as capacity, G/T, flexibility of routing traffic to beams and re-configuration of the spot-beam coverage, and payload mass and power. Candidate antenna and front-end configurations were studied, in particular direct radiating arrays, arrays magnified by a reflector and active focused reflectors with overlapping feed clusters for both transmit (multimax) and receive (beam synthesis). Regarding the on-board routing and beamforming sub-systems, analog techniques based on banks of SAW filters, FET or CMOS switches and cross-bar fixed and variable beamforming are compared with a hybrid analog/digital approach based on Chirp Fourier Transform (CFT) demultiplexer combined with digital beamforming or a fully digital processor implementation, also based on CFT demultiplexing. |
| NASA分類 | COMMUNICATIONS AND RADAR |
| レポートNO | 94N22765 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/114535 |
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