A frequency shift modified linear equation (LE)algorithm for sinusoidal frequency estimation was proposed to reduce fluctuation of LE and Quinn estimators for different frequencies and minimized erratic behavior of frequency shift es-timator.Frequency shift modification technique was also applied in the algorithm to minimize fluctuations for the different frequencies estimation.Estimation root mean square error (RMSE)was reduced to the lower bound of estimation.The simulation result proved that reduced RMSE of modified algorithm had fewer fluctuations than Quinn and modified Quinn estimators in low SNR conditions.%针对线性方程(Linear Equation,LE)和奎因(Quinn)频率估计算法在不同频率下产生波动和低信噪比条件下频移算法性能不稳定的问题,提出了基于频移修正的线性方程频率估计算法。该算法运用频移法,减小估计性能随被估频率产生的波动,使估计均方根误差在整个频段内接近于误差下限。仿真结果表明：对于任意频率的信号,修正算法频率估计的均方根误差均接近克拉美罗界,在低信噪比条件下修正算法估计的精度和稳定性皆优于其他几种算法。
展开▼
