基于FFT的正弦信号频率估计综合算法

摘要

This paper analyzes the performances of Rife algorithm and MJacobsen algorithm, points out that when the signal frequency is much close to the quantized frequency point, the precision of Rife algorithm decreases,but the precision of MJacobsen algorithm is higher;and when the signal frequency is close to the center of two neighboring quantized frequency points, the precision of MJacobsen algorithm decreases, but the precision of Rife algorithm is higher. By combining the two algorithms, a kind of synthetic algorithm is proposed. The simulation results indicate that this algorithm has fine and steady frequency estimation capacity in the whole frequency range. The approach can be easily realized in real applications due to the less calculation load.%分析了Rife算法和MJaeobsen算法的性能，指出当信号频率位于量化频率点附近时，Rife算法精度降低，MJacobsen算法精度较高；当信号频率位于两个相邻量化频率点的中心区域时，MJacobsen算法精度降低，Rife算法精度较高。结合这两种算法，提出了一种综合算法。仿真结果表明本算法在整个频段内性能稳定，精度较高，而且计算量较少，容易硬件实现。