Research on the monitoring technology of the BTM RF-uplink signal

In accordance with the relative railway standards about the balise, this paper proposed a special device to monitor the transmitting quality of the BTM´s uplink signal. The hardware circuits were designed based on the analysis of the receiving principle of the BTM, and the schematics was simulated and verified by using the Multisim software. Then the PCB was designed and the final prototype device was manufactured. Test and verify shows that the prototype´s performance complies with the design target. The device can be used to monitor and record the BTM uplink transmission signal, and to analyze the co-channel & adjacent channel interference.