Abstract
Many satellite projects use radio frequencies in the bands 2025–2110 MHz and 2200–2290 MHz for spacecraft operations and data transmission. Frequencies below a few GHz are of particular interest because of favourable propagation conditions and attractive antenna designs. The above bands have to be shared with the fixed service and the mobile service. The fixed service has announced plans for the introduction of vast quantities of a new type of application, referred to as the point-to-multipoint system to be used for data distribution or local access systems. At International Telecommunications Union (ITU) meetings, scenarios assuming the worldwide deployment of more than one million new fixed service installations have been presented. This paper assesses the interference potential from point-to-multipoint systems to conventional direct links between spacecraft and earth stations. The interference into the space as well as into the ground segment has been investigated. Typical earth stations with a 15 m dish size have been assumed. Interference received at low earth orbiters as well as geostationary satellites has been evaluated. It is shown that sharing will not be possible without technical or operational constraints on the fixed service systems. © 1997 by John Wiley & Sons, Ltd.
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