快速高精度正弦波频率估计综合算法

A Fast and Accurate Single Frequency Estimator Synthetic Approach

本文分析了正弦波的DFT系数的结构，通过DFT系数的相位信息，可以对正弦波的频率作精确的估计．该算法与Rife的算法性能互补，结合这两种算法，得到了一种综合算法．计算机模拟结果显示，本算法精度高，而增加的计算量并不大，并且容易硬件实现．

The structure of the Dry coefficients of a sine wave is analysed. A new accurate frequency estimator for a single sinusoid is proposed by using the information obtained from the phase of the DFT coefficents. Its performance is complemental with Rife algorithm. So that synthetic approach is proposed. The simulation results indicate that this approach is much better than the DFT and some other fast methods at the cost of double FFT which is far less than the MLE in computer time.