Evaluation and Analysis of Uplink Signal Interference in GEO Satellite System

Aiming at the problem of uplink signal interference in the satellite-earth link of GEO satellite system, this paper analyzes the satellite communication link interference model and interference evaluation methods, and the link interference model is constructed by considering various factors comprehensively. Then, the interference evaluation method based on the spectral separation coefficient is used to quantitatively evaluate the attenuation of carrier-to-noise ratio of the useful signals received by the receiving station from multiple dimensions. The results show that the interference effect increases with the increase of uplink interference signal power, and presents an exponential increase after reaching a certain value; Under the same interference signal power, the increase of the number of interference stations will lead to the decrease of the attenuation rate of carrier-to-noise ratio of useful signals and gradually moderate. The closer the interference station is deployed to the area near the transmitting station, the more obvious the interference effect will be. However, due to the power characteristics of the satellite transparent transponder, its position change in the nearby region has little influence on the interference effect.