The experimental research of NLOS UV propagation channel in the atmosphere based on LIA technology

摘要

In the paper, The importance of research in non-line-of sight(NLOS) ultraviolet(UV) propagation channel is first pointed out, and then an experimental system based on Lock-In-Amplifier (LIA) technology is set up to explore the NLOS UV propagation channel characteristics in the atmosphere, and the related experimental results are good helpful to design and evaluate the NLOS UV communication system. The research results show that: firstly, the received energy decreases much quickly with the distance enlarged, and it is also influenced by the emitting elevation angle and emitting field of view angle; secondly, the visibility, wind force, rain rate and fog has little influence on the received power in the short working distance, but with the propagation distance is getting longer, the fog play an very important role on the received signal; finally, some effective methods to enlarge UV communication system distance are discussed, such as UV source power, received antenna diameter and UV detector quality, and experimental data show that the best way to improve UV communication system is to improve the detector sensitivity.