基于FFT和频谱校正法的信号处理的研究

Research on Signal Processing Based on FFT and Frequency Spectrum Correction

FFT谱分析只能对有限的离散采样信号进行处理,这就不可避免的存在由于时域截断而产生频谱泄露,使测量精度降低。因此必须采用其他方法进行改进以提高测量精度。本文主要采用能量重心校正法以满足实际应用中对频谱分析精度的要求。仿真结果表明,在非整周期采样的情况下,精度已经有了很大程度的提高,因此在一定程度上足以满足实际应用的要求。

FFT Spectrum analysis can only dispose a limited number of discrete sampling signal, this is inevitable occurs the leak of time domain truncation, which decrease the accuracy of measurement. So we must use an approach to improve and increase the precision. The energy centrobaric method is adopted to satisfy the requirement of spectrum analysis precision in practical application. The simulation results show that, under the condition of a whole cycle sampling, the accuracy has been improved greatly and is sufficient to meet the requirements of practical application.