Propagation Loss Analysis of High Frequency Radio Waves in Multihop Paths

Hanghai Fan, Fangfang Qu, Shihui Yuan

school of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China

Abstract: High-frequency radio waves are the signal frequencies at 3-30MHz high-frequency radio waves can be reflected back to earth by the ionosphere in the atmosphere– a method known as "skip" ｏｒ "sky wave" propagation–these frequencies are suitable for long range communications across interconti-nental distances. When HF propagates through ionosphere, signal weakness is accompanied by signal at-tenuation, including the loss absorption in ionosphere and during reflection. Due to turbulent flow in the ocean, turbulence may affect the electromagnetic properties of the seawater, and also change the seawater reflection surface. The azimuth and the state of motion cause an increase in the reflection loss of the water surface, while the surface reflection loss changes continuously with the turbulence. So we study the impact of these three processes on the attenuation of radio waves.

Keywords: Plasma angular frequency; Propagation loss; High-frequency radio waves