离散频谱时移相位差校正法

基金项目: 国家自然科学基金资助项目(50075049);国家教育部高等学校骨干教师资助计划项目(教技司[2000]65号)

Time-Shifting Correcting Method of Phase Difference on Discrete Spectrum

1.
Department of Mechatronic Engineering, Shantou University, Shantou, Guangdong 515063, P R China;
2.
Department of Mechanical Engineering, Chongqing University, Chongqing 400044, P R China

摘要: 提出了一种通用的时移相位差离散频谱校正方法;第二段时域序列比第一段滞后L点,对这两段时域序列分别作相同的N点FFT分析,然后利用对应峰值谱线的相位差进行频谱校正。谢明、张晓飞、丁康提出的方法是此法的一个当L=N时的特例。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。
- 频谱分析 /
- 校正 /
- 信号处理 /
- 相位差
Abstract: A general method called time-shifting correcting method of phase difference on discrete spectrum is presented. That is, the second discrete-time sequence lags behind the first one with L points, then performing N-point FFT analysis on both sequences, and finally correcting spectrum by making use of the phase difference of two corresponding peak lines. The method proposed by XIE Ming et al is just the particular case of this method in the case that L is equal to N. Simulation result shows that this method is easily carried out with high precision, applicable for all kinds of symmetrical window functions and having high ability of anti-noise.
- spectrum analysis /
- correction /
- signal processing /
- phase difference

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