Propagation Analysis on High Elevation Angle for S-Bands Mobile Satellite Communications

Abstract

[Abstract] In the satellite communications such as quasi-zenith satellites which can maintain the high satellite elevation angle, the deep fading characteristic is reported on the radio frequency band (UHF band) even if in line-of-sight environments. Using pseudo-satellite and -receiving equipment, we measured the received power of uplink and downlink for satellite-elevation angles between 70 and 88 degrees to validate a high satellite-elevation angle propagation model that models the effects of reflection and diffraction due to building walls and edges on received power in mobile satellite communications systems. There was good agreement between the theoretical and experimental results in order to consider both of the left and right hand circularly polarized wave, so our model can be used to investigate and predict received power for other satellite systems with high satelliteelevation angles. This should, in turn, lead to better-designed mobile satellite communications systems. In this paper, we describe details of our examination and propagation model to contribute to realization of the high transmission quality in future mobile satellite communication systems.