改进Rife-Vincent(Ι)窗的FFT介质损耗角测量

非同步采样信号后，利用快速傅里叶变换（FFT）对信号处理时会出现频谱泄漏，导致FFT介质损耗角测量精度不高.为了提高介质损耗角测量精度，通过Rife-Vincent(Ι)窗的自乘运算构造出一种新的余弦窗，并设计了基于改进Rife-Vincent(Ι)窗的FFT介质损耗角测量方法.新窗函数比传统窗函数具有更好的旁瓣特性，可以提升频谱泄漏的抑制效果.仿真实验结果表明，加Rife-Vincent(Ι)自乘窗方法比加Hanning窗、加Blackman窗方法的介质损耗角测量精度更高.

FFT Dielectric Loss Angle Measurement of Improved Rife-Vincent(Ι) Window

Due to the asynchronous sampling of the signal,there will be spectrum leakage when using FFT to process the signal,resulting in the low measurement accuracy of FFT dielectric loss angle.In order to improve the measurement accuracy of dielectric loss angle,the side lobe characteristics of different window functions are analyzed.A new cosine window is constructed through the self-multiplication operation of Rife-Vincent (Ι) window,and an FFT dielectric loss angle measurement method based on improved Rife-Vincent (Ι) window is proposed.The new window function has better sidelobe characteristics than the traditional window function,and improves the suppression effect of spectrum leakage.The simulation results show that the measurement accuracy of using Rife-Vincent (Ι) self-multiplication window method is higher than that of using Hanning window and Blackman window method.