CAJ | 학술논문

针对Fitz频率估计算法频率估计方差在高信噪比情况下仍与克拉美劳下限存在着较大差距问题，提出了一种改进的Fitz频率估计算法。首先定义一种广义Kay窗函数加权的修正自相关函数，然后计算修正自相关函数相位的加权和，最终得到复正弦信号的频率估计值。仿真实验结果表明：当数据长度N＝24，信噪比sNr ＝20 dB时，改进算法的频率估计方差降低了约2 dB，且改进算法的计算复杂度与Fitz算法相当。因此，改进算法在满足实时性要求的同时，取得了更高的频率估计精度。
침대Fitz빈솔고계산법빈솔고계방차재고신조비정황하잉여극랍미로하한존재착교대차거문제，제출료일충개진적Fitz빈솔고계산법。수선정의일충엄의Kay창함수가권적수정자상관함수，연후계산수정자상관함수상위적가권화，최종득도복정현신호적빈솔고계치。방진실험결과표명：당수거장도N＝24，신조비sNr ＝20 dB시，개진산법적빈솔고계방차강저료약2 dB，차개진산법적계산복잡도여Fitz산법상당。인차，개진산법재만족실시성요구적동시，취득료경고적빈솔고계정도。
Fitz frequency estimation algorithm frequency estimation variance in the high SNR is higher and there is a big gap between the CRB. An improved Fitz frequency estimation algorithm,which first defines the modified autocor-relation function weighted by generalized Kay window has been proposed,and then calculates the sum of the weigh-ted phases of the modified autocorrelation function,finally gets the frequency estimation of the complex sinusoidal signal in AWGN. Computer simulation and analysis shows that:the frequency estimation variance of improved algo-rithm decreases about 2 dB when the data length is 24 and the signal to noise ratio is 20 dB,while the calculated a-mount of improved algorithm and original algorithm is about the same. In the other words,the proposed algorithm to meet the real-time requirement,achieves a higher frequency estimation precision.