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针对单点频信号,基于相关系数,在现有频率估计方法的基础上,提出了一种新的频率估计算法,称之为相关测频算法。该方法在FFT的基础上,结合相关系数进行估计。理论研究和仿真分析表明:当被估计信号的信噪比较大时,相关测频算法的估计误差接近Cramer-Rao下界。与迭代插值FFT估计算法和改进Rife算法相比,相关测频算法的估计精度略低,但计算量较低,适合工程应用。
According to the single frequency signal, based on the correlation coefficient, a new frequency estimation algorithm based on the existing frequency estimation method is proposed, which is called correlation frequency measurement algorithm. The method based on FFT, combined with the correlation coefficient estimation. The theoretical analysis and simulation analysis show that when the signal-to-noise ratio of the estimated signal is large, the estimation error of the relevant frequency-measuring algorithm approaches the Cramer-Rao lower bound. Compared with the iteratively interpolated FFT estimation algorithm and the improved Rife algorithm, the relative accuracy of the relevant frequency measurement algorithm is slightly lower, but the computational complexity is lower, which is suitable for engineering application.