王欣欢,陈怀海.一种改进的频谱修正法[J].国外电子测量技术,2016,35(11):27-31
一种改进的频谱修正法
Improved spectrum correction method
  
DOI:
中文关键词:  频谱分析  平顶自卷积窗  幅值修正
英文关键词:spectral analysis  flat top self convolution window  amplitude correction
基金项目:
作者单位
王欣欢 南京航空航天大学振动工程研究所 南京 210016 
陈怀海 南京航空航天大学振动工程研究所 南京 210016 
AuthorInstitution
Wang Xinhuan nstitute of Vibration Engineering Research,Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 
Chen Huaihai nstitute of Vibration Engineering Research,Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 
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中文摘要:
      针对信号快速傅里叶变换中非整周期截断采样而造成的频谱泄露问题,提出了一种基于平顶自卷积窗的相位差校正方法。首先利用平顶自卷积窗对信号进行加权以抑制频谱泄露,其次利用相位差校正法得到频率和相位的计算公式,最后通过反推法得到对幅值修正的多项式公式。将使用汉宁窗、布莱克曼窗、布莱克曼 哈里斯窗的相位差校正法与本文提出的方法进行了对比分析,仿真结果表明加平顶自卷积窗的方法对信号参数估计准确度更高。
英文摘要:
      A phase difference correction method with the Flat top self convolution window is proposed in the article to solve the spectral leakage problem in FFT duo to the non integral period signal sampling. Firstly, the Flat top self convolution window is used to weight the sampled signal to suppress the spectrum leakage. Then, the formula for the calculation of frequency and phase of the signal are derived by the phase difference correction method. Finally, an approach by inverse derivation for the spectral amplitude correction with modified polynomials is set forth. A simulating example with Hanning window, Blackman window, Blackman Harris window and Flat top self convolution window respectively is given and the results show that the method proposed in this paper is the best.
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