适用于加各种窗的一种离散频谱相位差校正法

针对现有两种离散频谱相位差校正法的局限,提出了一种构造新序列,即将原时域序列前N/2点平移N/4点,将序列的前后N/4点置零,分别对原序列和新序列进行FFT分析,利用对应峰值谱线的相位差进行频谱校正的通用方法.与原两种相位差法相比,这种方法只采一段时域信号,且进行两次相同点数的FFT分析.仿真结果表明,该方法实现方便,精度较高,适合各种对称窗函数,抗噪声能力强.

A Phase Difference Correcting Method on Discrete Spectrum Adapting to Any Window Function

Aimed at the limitation of two current kinds of Phase Difference Correction on discrete spectrum,a new global method is presented.That is to construct a new sequence by shifting the former N/2 points of original time-domain sequence at the scale of N/4 points,set both the former and latter N/4 points to zero,and then perform FFT analysis on the original sequence and new one.The spectrum can be corrected by taking advantage of the phase difference of two corresponding peak lines.Compared with the original two kinds of Phase-Difference Correction,only one sequence of time-domain signal is sampled and FFT analysis of same points is performed twice in this method.Simulated result demonstrates that this method is easily carried out with high precision,suits for all kinds of symmetrical window function and has high ability of anti-noise.