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Applied Mathematics and Mechanics (English Edition) ›› 2002, Vol. 23 ›› Issue (7): 819-827.

• 论文 • 上一篇    下一篇

TIME-SHIFTING CORRECTING METHOD OF PHASE DIFFERENCE ON DISCRETE SPECTRUM

丁康1, 罗江凯2, 谢明2   

  1. 1. Department of Mechatronic Engineering, Shantou University, Shantou 515063, P R China;
    2. Department of Mechanical Engineering, Chongqing University, Chongqing 400044, P R China
  • 收稿日期:2000-07-27 修回日期:2002-04-25 出版日期:2002-07-18 发布日期:2002-07-18
  • 基金资助:
    the National Natural Science Foundation of China(50075049);Planed item for distinguished teacher invested by Ministry of Education PRC(No.65[2000])

TIME-SHIFTING CORRECTING METHOD OF PHASE DIFFERENCE ON DISCRETE SPECTRUM

DING Kang1, LUO Jiang-kai2, XIE Ming2   

  1. 1. Department of Mechatronic Engineering, Shantou University, Shantou 515063, P R China;
    2. Department of Mechanical Engineering, Chongqing University, Chongqing 400044, P R China
  • Received:2000-07-27 Revised:2002-04-25 Online:2002-07-18 Published:2002-07-18
  • Supported by:
    the National Natural Science Foundation of China(50075049);Planed item for distinguished teacher invested by Ministry of Education PRC(No.65[2000])

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摘要： 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.

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.

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