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根据时域反射法(TDR)原理建立航空电缆绝缘故障模型,进行仿真模拟,并加入高斯白噪声,得到时域反射法仿真模拟数据。由于噪声的存在,导致绝缘故障处的反射信号不明显,不易对故障位置定位。提出一种新的时域反射法数据的去噪与故障定位方法,利用希尔伯特黄变换(HHT)对时域反射法数据进行去噪,并对故障位置进行精确定位,误差小于1%。结果表明,该方法对航空电缆时域反射法数据的噪声去除与故障定位都具有良好的效果。
According to the principle of Time Domain Reflectometry (TDR), the model of aviation cable insulation fault was established, simulated and gaussian white noise was added to get the simulation data of time domain reflection. Due to the existence of noise, the reflected signal at the insulation fault is not obvious, so it is not easy to locate the fault location. A new method of denoising and fault location for time-domain reflectometry data is proposed. By using Hilbert-Huang Transform (HHT), the time domain reflectometry data is denoised and the location of the fault is accurately located. The error is less than 1% . The results show that this method has a good effect on the noise removal and fault location of aerospace time-domain reflectometry data.