相参信号频谱的精确估计

首先讨论了用离散傅立叶变换对信号频谱的幅值、频率、相位进行精确估计的两种方法,在此基础上提出了一种对多个相位相参的分段信号进行频谱估计的新方法,该方法充分利用了各段信号之间的相位关系,通过相位联系对由单段信号得到的频谱估计做进一步的修正。仿真结果显示,本算法有很高的精度,在一定的信噪比下,其频率估计精度比单段信号大约可提高一个到两个数量级。

Spectrum Estimating of Correlative Signal

This paper firstly discusses two methods for estimating exactly the amplitude,frequency and phase of a signal by discrete fourier transform(DFT).Secondly,on the basis of the discussion,a new method is proposed to estimate the spectrum of subsection signals among which there exists phase correlativity.The method makes full use of information included by the subsection signal.The simulation results show that the new algorithm possesses higher precision and less calculation expense than ordinary DFT.