| タイトル | Geolocation applications of the Gonets LEO messaging satellites |
| 本文（外部サイト） | http://hdl.handle.net/2060/19950016401 |
| 著者（英） | Ashjaee, Javad M.; Vlasov, Vladimir N. |
| 著者所属（英） | Nauchno-Proizvodstvennoe Obedinenie Precision Instruments |
| 発行日 | 1993-01-01 |
| 言語 | eng |
| 内容記述 | Geostationary satellites carry a majority of the international telecommunications traffic not carried by transoceanic cable. However, because the radio path links to and from geostationary satellites total at least 70,000 km and because of inherent on-board spacecraft power limitations, earth stations used in conjunction with geostationary satellites are usually large and expensive. This limits their installation to areas with a well-developed industrial and economic infrastructure. This reality helps perpetuate a chicken egg dilemma for the developing countries and isolated regions. Economic integration with the developed world requires being 'networked'. But for many developing entities, even the initial price of entry exceeds their modest resources. Exclusion from the global information highways virtually assures retardation of economic growth for developing nations, remote and isolated areas. Very Small Aperture Terminal (VSAT) earth stations are often thought of as a solution for networking developing regions. But economic considerations often forecloses this option. If VSAT size and cost is to be minimized, powerful spot beams from the satellite need to be focused on relatively small regions. This is not often feasible because of the high cost of the satellite itself. To dedicate a high power spot beam to a small region is usually not economically feasible. |
| NASA分類 | COMMUNICATIONS AND RADAR |
| レポートNO | 95N22818 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/108370 |
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