Technology Research, Based On The Detection Of Solar-blind Uv Communication Receiver

Ultraviolet Optics Communications is a new type of communications system in atmosphere optics communications fields. Its excellent performances such as safety, anti-interference, non-line-of-sight, make it different from infrared optics communications. Hence, ultraviolet optics communications gratified the need of special and confidential communications in army.Detect of the solar-blind ultraviolet is still a difficulty of the communications system. In order to solve the problem, this paper majored on the following tasks:Firstly, analyzed the solar-blind ultraviolet optics transmitting characteristics. This paper choosed ultraviolet light with wavelength of 248 nm as the carrier of atmosphere optics communications. Because of the ozone, the astrospace ultraviolet light whose wavelength is less than 280 nm is absorded by ozone before it reaches the earth's surface. There is no exist disturbance which comes from the sun. Furthermore, ultraviolet optics can realize non-line-of-sight communications in certain area because of its dispersion. That is much different from the rigorous orientation's restrictions of transmitter and receiver in the infrared optic communications which is only used in line-of-sight communications. This is a very fascinating characteristic of atmosphere optics communications. Due to ultraviolet communications is realized by ultraviolet scattering, so the ultraviolet propagation is influenced by atmosphere turbulence and multi-path effect. This paper researched the influence of the ultraviolet propagation by the absorption of ozone, the scattering of atmospheric molecule and aerosol, multi-path effect and atmosphere turbulence effect. The results illustrate that the solar-blind ultraviolet communications is influenced by the scattering of atmosphere and atmosphere turbulence greatly.Secondly, established a simple and applicable solar-blind ultraviolet communications non-line-of-sight model—single scattering channel model which according to the solar-blind ultraviolet optics transmitting characteristics. This model including the elevation of the transmitter, the divergence angle of the beam, the elevation of the receiver and the viewing angle of the receiver. The results illustrate that the received signal is influenced by the elevation of the receiver and transmitter, divergence angle,receive angle greatly.Finally, according to the solar-blind ultraviolet optics transmitting characteristics and the single scattering channel model, we drew up a direct detect proposed bill. And designed a direct detect system by selecting CPC optical antenna, ultraviolet filter and ultraviolet detector. And calculate the detect system's performance. The results illustrate that the detector can response.Establishing the ultraviolet communications system is a huge project, including much subject knowledge. So this paper majored on the detect part, and worth further research.