频率估计的一种多段同频正弦信号频谱相关算法  

A Frequency Estimation Algorithm Based on Spectrums Correlation of Multi-section Co-frequency Sinusoids

作　　者：肖玮[1] 涂亚庆[1] 刘良兵[1] 莫正军[1] 

机构地区：[1]后勤工程学院,重庆401311

出　　处：《电子与信息学报》2012年第3期564-570,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60871098);重庆市重点自然科学基金(CSCT;2011BA2015)资助课题

摘　　要：为提高低信噪比条件下正弦信号的频率估计精度,针对多段同频正弦信号,该文提出一种基于频谱相关的频率估计算法。首先,构造加权因子对多段同频正弦信号频谱进行加权积累,得到最优加权积累频谱;然后,将多段同频正弦信号的最优加权积累频谱和累加频谱进行相关运算,得到频谱相关谱;最后,谱峰搜索频谱相关谱,实现频率的精确估计。模拟结果验证了该文算法的有效性。For improving the sinusoidal signal frequency estimation at low Signal-to-Noise Ratio（SNR）,a frequency estimation algorithm based on spectrums correlation of Multi-Section Co-Frequency（MSCF） sinusoids signal is proposed.Firstly,the Optimization Weighted-Accumulation（OW-A） spectrum is gained through weighted-accumulating spectrums of the MSCF sinusoids signal by the weighted factor.Secondly,the correlation spectrum is constructed by correlating the OW-A spectrum and the accumulation spectrum of the MSCF sinusoids signal.Consequently,frequency estimation can be obtained through spectral peak searching of the correlation spectrum.Simulation results demonstrate the superior performance of the proposed algorithm.

关 键 词：信号处理 频率估计 频谱相关 多段同频正弦信号 低信噪比 

分 类 号：TN911.7[电子电信—通信与信息系统]