频谱小偏差校正新方法

Novel Small Synchronous Error Correction Method in Spectrum Analysis

提出一种频谱校正新方法以克服小的同步偏差对频谱分析的影响。该方法包括信号频率实时估计、采样频率同步跟踪和谐波系数误差校正几个要素。信号频率估计采用改进的相位差法,谐波系数校正采用一个向量级数公式。频率估计和同步跟踪将采样同步偏差控制在较小范围,然后采用谐波系数校正算法进一步提高谐波测量的准确度。基于MATLAB软件的仿真结果证实了该方法的有效性。

A novel correction method is proposed to mitigate the effect of small synchronous error in spectrum analysis. The method consists of real-time estimation of signal frequency, synchronous tracking of sampling frequency and error correction of harmonic coefficients. Moreover, the signal frequency is estimated by using an improved phase difference method whilst the harmonic coefficients are corrected by using a vector series formula. The frequency estimation and synchronous tracking can make the sampling synchronous error very little and then the error correction method is adopted to improve the accuracy of the measured harmonics. The simulation results based on Matlab further prove the availability of the method proposed.