基于二维DFT 的多分量信号瞬时频率估计方法

Instantaneous Frequency Estimation Method of Multicomponent Signals Based onTwo-Dimensional DFT

在进行多分量信号瞬时频率估计时,存在较大误差,为此提出基于二维DFT的多分量信号瞬时频率估计方法。首先通过建立多分量信号模型获取到多分量信号瞬时频率的相参特性,然后利用二维DFT技术对多分量信号脉冲特性进行变换,最后利用加权均值的方法求出多分量信号瞬时频率,以此完成基于二维DFT的多分量信号瞬时频率估计。经实验证明,设计方法估计误差小于传统方法。

There is a big deviation in the instantaneous frequency estimation of multicomponent signals,so a method of instantaneous frequency estimation of multicomponent signals based on two-dimensional DFT is proposed.Firstly,the coherent characteristics of the instantaneous frequency of the multicomponent signal are obtained by establishing the multicomponent signal model.Then,the pulse characteristics of the multicomponent signal are transformed by using the two-dimensional DFT technology.Finally,the instantaneous frequency of the multicomponent signal is obtained by using the weighted average method,so as to complete the instantaneous frequency estimation of the multicomponent signal based on the two-dimensional DFT.The experimental results show that the estimation error of the design method is smaller than that of the traditional method.