Polynomial Fitting Approach for Wireless Signal Field under Power Lines in Taiwan Railway

The purpose of this paper is to research wireless systems for the message communicated to trolleys and level-crossings under power lines. The purpose used with wireless communication, linked with level-crossings, and uses the radio propagation to dispatch message from the wireless facilities to the trolleys along Taiwan railway when the urgent situation is taken place or the emergency button is pushed by passersby to permit the train driver to practice the critical situation previously. The results for static and dynamic measurement of this wireless system, concerned with the level-crossing and the trolley, is able to offer an improved assignment regulation. In order to estimate the wireless signal field, we perform some practical measurements under power lines, then use the polynomial approximation to verify the wireless signal field, therefore we create a optimal propagating model for Taiwan railway from Tainan to Fangliao separated by Western Line, Pingtung line, and Kaohsiung city line respectively