互相关改进法高精度测量电信号效果研究

为克服通过采样法测量电信号时由于噪声干扰造成的误差问题,基于传统的互相关法,提出了一种改进的互相关去噪法。该方法具有充分利用采样数据及准确估计原信号振幅的性能,能很好的恢复原信号数据,获得去噪效果;当采样时长为额定周期整数倍时,该方法还能有效抑制原信号的谐波分量,并以振幅和初相变化为代价克服原信号的频率偏差,重构出具有额定频率的正弦信号。数值模拟结果验证了文中方法的正确性和有效性,并通过分析重构出的电信号有效值误差数据,表明该方法能够满足高精度测量的要求。

Effect Analysis of Cross-correlation-improve Method High Accuracy Measuring Electrical Signal

When we measure electrical signal based on sampling method, consequences have large errors due to noise. To reconfigure original waveform better and improve consequences accuracy, this paper advances correlation-improve and mean-value method based on traditional cross-correlation theory. The method can use sampling data plenty and reconfigure original waveform accurately for high-accuracy measurement. In addition the method can control harmonic component and overcome frequency deviation when it is the Integral multiple of sampling period. At last accuracy and outstanding of the method is proved by simulation and contrasting effective value.