摘要
提出了一种新的正弦信号频率估计方法。利用FFT对信号频率作粗估计,然后对原信号下变频至基带。对基带信号作相位差分,估计频偏。最后对粗估计进行频率校正,使估计性能得到提高。在整个频段上该方法与R ife算法性能互补,在此基础上又提出了综合方法。仿真结果表明,该频率校正算法实现简单,运算量小,且性能不随被估计信号的频率分布而产生波动,在适度信噪比条件下均方根误差小于1.5倍的CRLB,具有广阔的应用前景。
A new method for estimating the frequency of a sinusoid signal is proposed. Firstly, FFT is used to estimate coarse frequency and the base band signal is obtained by using digital down conversion technology. Then, a phase difference is performed on the base signal vector to compute frequency offset. Finally, the fine result is obtained by the offset of coarse frequency, thus improving the performance. The approach is complementary with Rife algorithm in the whole frequency segment, so a synthetic approach is presented. The simulation result demonstrates that the method based on frequency offset correcting is easily realized with low computation complexity, and has good frequency stability. And RMS is less than 1.5 times of CRLB under the proper SNR.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2007年第5期597-600,共4页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
频率估计
相位差
正弦信号
信号处理
frequency estimation
phase difference
sinusoid signal
signal processing
