  The integration of satellite and terrestrial communication systems plays a
vital role in the fifth-generation mobile communication system (5G) for the
ubiquitous coverage, reliable service and flexible networking. Moreover, the
millimeter wave (mmWave) communication with large bandwidth is a key enabler
for 5G intelligent rail transportation. In this paper, the
satellite-terrestrial channel at 22.6 GHz is characterized for a typical
high-speed railway (HSR) environment. The three-dimensional model of the
railway scenario is reconstructed and imported into the Cloud Ray-Tracing
(CloudRT) simulation platform. Based on extensive ray-tracing simulations, the
channel for the terrestrial HSR system and the satellite-terrestrial system
with two weather conditions are characterized, and the interference between
them are evaluated. The results of this paper can help for the design and
evaluation for the satellite-terrestrial communication system enabling future
intelligent rail transportation.
