1、 QUESTION ITU-R 274/4 Technical methods for improving the spectrum/orbit utilization (2008) The ITU Radiocommunication Assembly, considering a) that there is currently a shortage of available spectrum and orbital resources in some segments of the geostationary-satellite orbit (GSO) and in some frequ
2、ency bands; b) that coordination of satellite systems operating in the same frequency band may be difficult when angular separation of satellites is less than 2- 3; c) that satellite systems which have already been brought into use are experiencing progressively increasing levels of aggregate interf
3、erence; d) that, in some cases, state-of-the-art signal processing methods may be used to substantially reduce the effect of interferences created by systems operating in the same frequency bands, decides that the following Questions should be studied 1 What earth station (ES) techniques could be us
4、ed to mitigate interferences between different satellite systems operating in the same frequency bands and having nearby GSO positions? 2 What is the reduction of mutual interference between different satellite systems that could be reached when applying special ES techniques intended for reduction
5、of interference, taking into account station-keeping of GSO satellites? 3 How much could efficiency of the use of spectrum/orbit resource be increased (i.e. by reduced angular separation) when applying state-of-the-art signal processing methods to ES signals? 4 To what extent are the advantages accr
6、ued by the incorporation of interference-reduction techniques offset by drawbacks such as increased operational complexity, additional ES facilities and other adverse operational impacts? further decides 1 that the results of these studies should lead to the formulation of appropriate Reports and/or Recommendations by 2010. Category: S1
