CAJ | 학술논문

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。
침대선성방정(Linear Equation,LE)화규인(Quinn)빈솔고계산법재불동빈솔하산생파동화저신조비조건하빈이산법성능불은정적문제,제출료기우빈이수정적선성방정빈솔고계산법。해산법운용빈이법,감소고계성능수피고빈솔산생적파동,사고계균방근오차재정개빈단내접근우오차하한。방진결과표명：대우임의빈솔적신호,수정산법빈솔고계적균방근오차균접근극랍미라계,재저신조비조건하수정산법고계적정도화은정성개우우기타궤충산법。
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.