Abstract
It is desirable to determine the potential for radio frequency interference between Earth stations and orbiting spacecraft. This information can be used to select frequencies for radio systems to avoid interference or to determine if coordination between radio systems is necessary. Also, it is useful for planning emission standards and filtering requirements for future telecommunications equipment. A model is developed that will determine the statistics of interference between Earth stations and elliptical orbiting spacecraft. The model uses orbital dynamics, detailed antenna patterns, and spectral characteristics to obtain accurate levels of interference at the victim receiver. The model is programmed into a computer simulation to obtain long-term statistics of interference. An example is shown to demonstrate the model. Interference from Earth-exploration satellites to a deep-space Earth station is simulated. This paper includes the effect of data asymmetry and finite transition time on the interference statistics. It is shown that moderate data asymmetry can adversely affect the interference at a deep space Earth station receiver.
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