Research on dynamic pattern of balise up-link signal based on the electromagnetic field theory

Mathematical models of Magnetic Field Distribution(MFD) for the Balise antenna and the Balise Transmission Module (BTM) antenna were built based on the electromagnetic field theory; Mathematical formulas for the Tele-powering Radiation Pattern (TPRP), the BTM Receiver Threshold Curve (BRTC) and the Static Up-link Signal Pattern (SUSP) were derived, which captured the radiation directionality of the Tele-powering signal and the sensitivity of BTM for Up-link signal receiving; The Dynamic Up-link Signal Pattern (DUSP) was developed combining the velocity factor and the transient behavior of equipment; The DUSP simulates the Up-link signal received by BTM antenna when the train passes over the Balise at a high speed without any physical movements of the equipment in the laboratory. The validity and rationality of such theoretical simulations were verified by static and dynamic experimental data, which has a vital significance to high-speed adaptability research and dynamic capability test of BTM.