抄録
Safety is our first mission. To insure the safety railway operation, we have to keep in touch between the on board crews and dispatchers. The train radio is the key technology to tie between them. The radio we have been operated for 20 years, which is used sound technology and not ready for data communication, and the voice distinction is worse than the modern digital radio. We have some reasons to convert to the digital radio. The first, the voice will be clearer than ever. The second, we can realize the data communication. The third, the bandwidth is narrower than the current system and we can divide from one communication channel to 2 channels. But before we step forward to digital radio system, we have to make strategy to convert to digital, because the current analog radio stations both fixed and mobiles-are huge numbers and change to digital system gradually. If we can change analog to digital easily, it will be the easiest way to convert to newer system. At that point of view, we noticed that software defined radio can change the radio type by changing the software on the common hardware platform. In this paper we describe about newly developed train radio using software defined radio (SDR) technology, synchronized between radios via the Ethernet, encryption method for data communication and resolution IP address from train number.
