基于混合卷积窗三谱线插值的介损角测量方法

Dielectric Loss Angle Measurement Method Based on Mixed Convolution Window with Three Spectral Lines Interpolation

快速傅里叶变换在非同步采样下进行介损角测量时,将无法避免地产生频谱泄露和栅栏效应,严重影响了介损角测量时的准确性。文中提出一种基于Hanning与Nuttall混合卷积窗的三谱线插值介损角测量算法,将所提算法与加经典窗算法进行对比分析可知,该混合卷积窗算法具有更快的旁瓣衰减速率和较窄的主瓣宽度,能有效克服因非同步采样造成的介损角测量误差。通过频率变化、谐波含量波动、白噪声影响、采样点变动下的介损角测量仿真实验,进一步验证了文中所提算法的准确性和可靠性。

Dielectric loss angle measurement under non⁃synchronization sampling by the use of fast Fourier transform method will inevitably produce spectrum leakage and picket fence effect and will seriously influence the accuracy of dielectric loss angle measurement.In this paper,a kind of dielectric loss angle measurement method based on Hanning and Nuttall mixed convolution window with three spectral lines interpolation is proposed.It is known by comparison and analysis of the proposed algorithm with the classical windows algorithm that the mixed convolution window has faster side lobe attenuation rate and narrow main lobe width and can effectively overcome the dielectric loss angle measurement error caused by non⁃synchronization sampling.The accuracy and reliability of the proposed algorithm are verified further by simulation experiments of dielectric loss angle measurement under frequency variation,harmonic content fluctuation,white noise influence and sampling point variation.