A VMD Based Improved De-noising of Onboard BTM Receiving Signal  

作　　者：GENG Qi WEN Yinghong LIU Shanghe ZHANG Dan 

机构地区：[1]Institute of Electromagnetic Compatibility Beijing Jiaotong University,Beijing 100044,China [2]National Key Laboratory of Electromagnetic Environment Effects,Shijiazhuang Campus,Army Engineering University,Shijiazhuang 050003,China

出　　处：《Chinese Journal of Electronics》2020年第1期66-72,共7页电子学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.U1734203);the National Natural Science Foundation of China(No.61631013);Beijing Municipal Science&Technology Commission(No.Z181100001018032)

摘　　要：As a key equipment of the high-speed Electric multiple unit(EMU),the Balise transmission module(BTM)is tend to be affected by electromagnetic disturbances.However,the existing filter can not well elimina te elec tromagnetic distu rbances.In order to improve the Signal to noise ratio(SNR)of BTM uplink signal,Variational mode decomposition(VMD)method is introduced into de-noising the uplink signal polluted by disturbance.The proposed de-noising method decomposes the noise-polluted signal into several narrow band subsignals.And then,the de-noised BTM transmitting signal is reconstructed by the sub-signals of the same frequency as the BTM carrier.To improve the accuracy of the VMD based signal decomposition,the Normalized short time fourier transfbrm-Wigner ville distribution(NSTFTWVD)method are applied to det ermine the decomposition mode number of the targe t signal.The proposed method is used to deal with both Simulation signal and measured BTM uplink signal.Results demonstrated good improvement in SNR by 20dB and 12.63dB,respectively.As a key equipment of the high-speed Electric multiple unit(EMU), the Balise transmission module(BTM) is tend to be affected by electromagnetic disturbances. However, the existing filter can not well eliminate electromagnetic disturbances. In order to improve the Signal to noise ratio(SNR) of BTM uplink signal, Variational mode decomposition(VMD) method is introduced into de-noising the uplink signal polluted by disturbance. The proposed de-noising method decomposes the noise-polluted signal into several narrow band subsignals. And then, the de-noised BTM transmitting signal is reconstructed by the sub-signals of the same frequency as the BTM carrier. To improve the accuracy of the VMD based signal decomposition, the Normalized short time fourier transform-Wigner ville distribution(NSTFTWVD) method are applied to determine the decomposition mode number of the target signal. The proposed method is used to deal with both simulation signal and measured BTM uplink signal. Results demonstrated good improvement in SNR by 20 dB and 12.63 dB, respectively.

关 键 词：Electromagnetic disturbance Balise transmission module(BTM) Variational mode decomposition(VMD) De-noising. 

分 类 号：TN713[电子电信—电路与系统] U284.48[交通运输工程—交通信息工程及控制]