Quantifying the interference levels due to antenna pointing errors in satellite communications

The effective isotropic radiated power (EIRP) from Earth terminals that are mounted on vehicle platforms is time-varying and hence will result in a time-varying interference signal at neighboring geostationary satellites. This paper provides a methodology to analyze and quantify the time-varying interference resulting from vehicle mounted Earth stations. Time-varying interference effects from non-geostationary satellites have been addressed previously in ITU-R Recommendation S.1323-2. This recommendation also establishes the maximum permissible time allowance for short-term interference levels. This paper follows the guidelines established in the above recommendation and develops a methodology to analyze the interference due to time-varying antenna pointing errors of Earth terminals mounted on vehicles.