To study the properties of the phase spectrum of all-phase FFT(apFFT for short)and extend its application fields,this paper presents the phase measurement mechanism based On apFFT from the phase spectrum in polar coordinate,vector analysis,matrix analysis,and simulation,etc.And apFFT properties of the phase measurement without correcting spectrum and the restraining spectral leakage are analyzed.The experiment shows that the variance of the phase measured by apFFT is at least 2/3 lower than that of FFT with the same order,so "all phase meter"is expected to be applied in the device fault detection,the harmonic analysis of the power system,GPS navigation and positioning,etc.%为深入研究全相位FFT(all-phase FFT,apFFT)的相位谱性质以扩大其应用范围,本文从极坐标相位谱图、矢量分析、矩阵分析及其仿真实验等多个角度阐述了apFFT的相位测量机理,较透彻地剖析了apFFT的无需频谱校正的相位测量性质和抑制谱泄漏性能;实验表明,apFFT的测相方差至少比同阶数的FFT测相方差低2/3以上.因而"全相位计"可望在设备故障诊断、电力系统谐波分析、GPS导航定位等领域有着广阔应用.
展开▼
