Criteria to Limit Interference Resulting from Antenna Pointing Errors

Vehicle-Mounted Earth Station (VMES) terminals are new terminals and interference from these terminals is time varying. Recommendations (Recs.) ITU-R S.1857 and S.2029 were developed to assess and limit the time-varying interference from these terminals. In this paper we consider the effects of interference due to motion-induced antenna pointing errors using the traditional "worst-case" interference criterion and the criterion established in Rec. ITU-R S.1857. It is shown that in order to satisfy the worst-case interference criterion the power level of the terminal has to be reduced by a large amount, for example 6 dB. On the other hand, it is shown that according to the methodologies developed in Rec. ITU-R S.1857 these same interference levels can be accommodated at the victim receiver with a negligible power penalty at the VMES terminal.