一种局部DFT的基波相位快速高精度估计方法

A FAST AND ACCURATE METHOD FOR ESTIMATING THE FUNDAMENTAL PHASES BASED ON LOCAL DFT

常用的基波相位计算方法对噪声较敏感，特别是难以实现在线、实时、高精度的基波相位估计。本文提出一种边采样边计算的相位估计方法，通过计算两项局部DFT系数，并利用插值函数和修正函数快速估计基波相位。计算机仿真结果显示，该方法具有计算精度高、适应噪声能力强、计算速度快等特点，适合于在线相位估计。

The conventional methods of computing the fundamental phases are susceptible to noise and are difficult to be used to get the on-line accurate phase-estimation. A new method of fundamental phase-estimation is proposed in this paper by computing two local DFT coefficients of which corresponding parts are calculated soon after every sampling, using interpolation and modification functions on time. Simulated results show that the method has high computational accuracy and is adaptive to noise, which makes it suitable for the on-line phase estimation.