On the principle of uniformity of satellite communications systems

It is not clear whether the criterion of homogeneity for a satellite-to-Earth link is to be considered as the equal power of the onboard transmitters of the potentially incompatible systems or equal power density at the boundary of the service area. A detailed analysis is presented of a system consisting of two satellites in geostationary orbit which service different areas, where the differences between them are such that the system 2 satellite has a more harmful impact on the system 1 Earth station than does the system 1 satellite on the system 2 Earth station. Crosstalk between the systems on the uplink is not considered here for the sake of simplicity, although the analysis can be readily extended to this case. The requisite condition for two such satellite systems being uniform is that the angular separation between the satellites of systems 1 and 2 from the standpoint of the effect of the interference of system 2 on system 1 is equal to the requisite separation from the standpoint of the effect of system 1 interference on system 2. This criterion is used as the basis for the derivation of quantitative expressions for the choice of the parameters of uniform systems.