基于全相位傅里叶变换的多普勒信号频谱提取

Doppler Signal Spectrum Extraction Based on All Phase Fourier Transform

针对截断效应和栅栏效应所带来的频谱泄露的问题,提出基于全相位快速傅里叶变换的多普勒信号频谱提取方法。该方法通过全相位快速傅里叶变换算法实时获取多普勒回波信号的幅度信息,进行幅度和频率的修正。理论和实测的多普勒信号仿真表明,相对于短时傅里叶变换,校正的全相位快速傅里叶变换算法提取的频谱更贴近理想多普勒信号频谱,其频谱幅度信息满足峰值识别的要求。

Aiming at the problem of spectrum leakage due to the truncation effect and the fence effect,a method of spectrum extraction of Doppler signal based on all phase Fourier transform was proposed.The method obtained real-time Doppler echo signal amplitude information through the all phase fast Fourier transform algorithm,then the amplitude and frequency was calibrated.The simulation of theoretical and actual measured Doppler signal showed that,compared with the short time Fourier transform,the extracted spectrum of actual measured Doppler signal based on the corrected all phase fast Fourier transform algorithm was more proximate to the spectrum of the ideal Doppler signal and its spectrum amplitude information met the requirements of the peak identification.