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为解决相位差法中频谱校正的问题,提出一种基于FFT最大谱线处相位差的离散频谱加权校正算法。从频谱次大值的相位差入手,将最大值误差与次大值误差进行加权校正,首先通过对相位差中最高值校正误差与次高值校正误差的结果分析,再按一定比例将最高值误差校正与次大之误差校正进行加权,并对加权校正结果进行对比。实验结果表明,该方法与传统相位差法相比,在频谱最高值相同的情况下,频率校正误差的频率分辨率提高了90%,提高了频率校正精度。
In order to solve the problem of spectrum correction in the phase difference method, a discrete spectrum weight correction algorithm based on the phase difference at the maximum spectral line of FFT is proposed. Starting from the phase difference of the second highest frequency spectrum, the maximum error and the next largest error are weighted and corrected. First, by analyzing the results of the highest error correction and the second highest error correction, then the highest value Error correction and the second largest error correction weighted, and the weighted correction results were compared. The experimental results show that compared with the traditional phase difference method, the frequency resolution of the frequency correction error is improved by 90% at the same frequency spectrum and the accuracy of frequency correction is improved.