快速傅立叶变换在轨道电压相位检测中的应用

轨道电压信号是判断铁轨上是否有火车的重要依据,对火车的安全运行非常重要,其相位差测量是重要环节.在比较目前几种常用相位测量方法的基础上,提出基于FFT的相位测量方法.该方法对被测信号谐波或噪声干扰有很好的抑制作用,对受干扰的周期信号间的相位差测量有很高的精度.给出硬件构成和算法的软件实现,检测结果表明提出的方法能快速准确地实现相位测量.

Application of FFT to phase measurement of track voltage

Track voltage signal which was a very important basis to judge if there was train on the track,and guarante the train security greatly. The phase measurement was a important part. After comparing some methods of phase measurement, a new method based on FFT was given. This method could restrain the disturbance and noice and haven a good precision in measuring the phase which had disturbance. It was given hardware structure and software. The result of test expressed that this method could implement phase measurement correctly.