| With the continuous progress of science and technology, the communications systems depended on different kinds of media obtain great development. Depending on the different media used, the common communication systems may approximately be divided into two separate kinds, one is the system which depends on the radio frequency, the other is the system depending on infrared or laser. Although the maturity and wide application of these systems, they each have some disadvantages, such as the easy interception by a third member of the radio communication system and the interference of the radio. And the communication systems on laser or infrared require strictly the position of the transivers, so they just can be applied in the line communication.Communication system in UV has the advantages over the systems above, especially the solar blind UV communication system. First, there are hardly any UV rays which have the wave length of lower than 290 nanometers because of the prevention from the solar blind UV ray, thus the system may work without the influences of the rays. Second, the solar blind UV may transmit in scattering way, the distance is very limited, this not only decides the scope of the system but also the monitor from a third party, thus the strong confidentiality.This article presents the atmospheric transmission characteristic of UV, system hardware and software design. It includes the following aspects:the system plan, system hardware designs, the software designs and the verification of the system. The future development of the system is also presented here.This communication system uses the STM32 controller as the core processor. CMX638 is applied to codec the voice package. The PMT is used to converse the analog signal to digital signal to let the core handle it. This system applies the 2FSK to achieve the transmission of voice information from point to point. |
