A Conflict in the Radio Frequency Spectrum of LEO-HTS and HEO-HTS Systems

Many analytical companies associate the development of the satellite communications market with new LEO/MEO/HEO-HTS systems with the target function of broadband access. The basis of these systems is the use of multisatellite constellations. Their practical realization requires solving numerous scientific and technical problems. One of the most painful problems is the problem of electromagnetic compatibility (EMC) between projected systems as well as between projected and operating satellite networks. The article shows that the realization of any of LEO-HTS systems results in a conflict situation in the radio frequency spectrum of the fixed-satellite and broadcasting-satellite services (Ku, Ka, Q/V bands). It is shown by the example of the analysis of EMC of LEO-HTS OneWeb and HEO-HTS Express-RV systems, the latter being oriented to servicing the Arctic regions in the Ku band, that to parry this conflict situation, a decrease in the capacity of subscriber radio links of the Express-RV system and/or an increase in the size of its subscriber antennas are required. The results of the analysis are presented for several geographical locations of subscriber terminals (from 60° N and more) and show that time intervals of interference action and C/I values depend considerably on their location in the Express-RV coverage area.