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在测量高速电气化铁道钢轨电位时,为滤除数据采集装置中接触网与受电弓系统耦合作用产生的高频电磁干扰而造成的噪音,同时为消除供电系统产生的静电干扰与磁干扰引起的附加噪音,需要采取有效的滤波措施。本文在数据采集系统的软件中采用了基于Matlab的低通IIR数字滤波器,有效滤除上述干扰造成的噪音,现场实测证实该滤波器能满足测量要求,为数字滤波器工程化应用提供了有益经验。
When measuring the rail potential of high-speed electrified railway, in order to eliminate the noise caused by the high-frequency electromagnetic interference generated by the coupling effect between the catenary and the pantograph system in the data acquisition device and to eliminate static electricity interference and magnetic interference generated by the power supply system Additional noise, need to take effective filtering measures. In this paper, the low-pass IIR digital filter based on Matlab is used in the software of data acquisition system to effectively filter out the noise caused by the above interference. Field measurements show that this filter can meet the measurement requirements and provide benefits for digital filter engineering applications experience.