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�������պ����ѧѧ�� 2011, Vol. 37 Issue (8) :1030-1033,1043    DOI:
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High-accuracy frequency estimation algorithm based on autocorrelation and phase difference method
Yang Dezhao, Song Ningfang, Lin Zhili, Ou Pan*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� In order to improve the frequency estimation accuracy of sinusoidal signal in white Gaussian noise, the correlation length m of the algorithm based on the autocorrelation operation was derived, and the equation representing the relationship of m and signal-to-noise ratio (SNR) was acquired. Given the data length N, the optimum value of m was N/3 when the SNR was large and it was N/2 when the SNR was small. The performance of segmented-FFT phase difference method and autocorrelation method were analyzed, and a new frequency estimation algorithm was proposed. The Monte Carlo simulation results verify that the new algorithm combines the advantages of the two methods previously mentioned, and avoid the disadvantages of them. It can fetch the highly accurate frequency of a signal in a wide range of SNR, and the computational cost is small.
Keywords�� frequency estimation   autocorrelation   fast Fourier transforms (FFT)   error analysis     
Received 2010-04-16;
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About author: �����(1981-),��,ɽ���Ͳ���,��ʿ��,yangdezhao1234@163.com.
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�����, ������, ��־��, ŷ��.��������ؼ���λ��ĸ߾���Ƶ�ʹ����㷨[J]  �������պ����ѧѧ��, 2011,V37(8): 1030-1033,1043
Yang Dezhao, Song Ningfang, Lin Zhili, Ou Pan.High-accuracy frequency estimation algorithm based on autocorrelation and phase difference method[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(8): 1030-1033,1043
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