Abstract
IThis paper focuses on interference aspects related to non-GSa satellite systems and presents results reflecting the effect of the oscillatory shape of the earth station antenna sidelobe gain pattern in the statistical behaviour of the aggregate interference produced by an interfering non-GSa system into the satellites of an interfered-with system. A Bessel function type of radiation pattern was adopted as a more realistic model for the antenna sidelobe gain since it reflects the oscillatory behaviour encountered in measured radiation patterns. This sidelobe gain oscillatory behaviour plays an important role when addressing interference calculations involving non-GSa systems, since due to the non-GSa system satellites dynamics not all entries in the aggregate interference are associated with the maximum sidelobe earth station antenna gain. Results indicate that. although often used in GSa satellite systems. this type of worst case interference calculation tends to be overly pessimistic if applied to the non-GSa satellite environment.
Highlights
Interference calculations involving GSa satellite systems are usually based on the assumption that the earth station sidelobe antenna gain is equal to an envelope of the form x - 25 log e
The oscillatory behaviour encountered in measured radiation patterns plays an important role when addressing interference calculations involving non-GSa sys tems, since due to the non-GSa system satellites dynamics not all entries in the aggregate interference are associated with the maximum sidelobe earth station antenna gain rep resented by its envelope
This paper considers two non-GSa satellite systems, here referred to as LEa I and LEa 2, and addresses the more critical case of up-link interference, in which the number of earth stations and their geographical distribution play an important role
Summary
Interference calculations involving GSa satellite systems are usually based on the assumption that the earth station sidelobe antenna gain is equal to an envelope of the form x - 25 log e. This paper considers two non-GSa satellite systems, here referred to as LEa I and LEa 2, and addresses the more critical case of up-link interference, in which the number of earth stations and their geographical distribution play an important role. These results illustrate the effects of the earth station antenna sidelobe gains and of the number of interfering earth stations in the up-link C / I cumulative distribution function. This type of result is important for the establishment of design objectives for the antennae of earth stations operating with non-GSa satellites.
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