DFT频谱分析中时域加窗的研究

Research on Time-domain-windowing of DFT Spectrum Analysis

阐述了DFT频谱分析过程中时域加窗的原因及过程,深入分析了不同的窗型和窗长对频谱泄露的大小和频率分辨率高低的影响,给出了相应的MATLAB仿真结果,提出了DFT谱分析中窗型和窗长选择的一般原则以提高DFT频谱分析的质量.

The cause and the method of time-domain-windowing in DFT spectrum analysis process are explained and how the different window-form and window-length impact the spectrum leakage and frequency resolution are analyzed deeply. The corresponding MATLAB simulation results are also obtained. Finally, the general principles how to select DFT spectrum analysis window-form and window-length to improve DFT spectrum analysis quality are presented.