脉冲多普勒频谱宽度估计的一种校正方法  

Estimating the Bandwidth of Doppler Signals Using a Correction Method

作　　者：汪源源[1] PeterJ.Fish 

机构地区：[1]复旦大学电子工程系,上海200433 [2]SchoolofElectronicEngineeingScience,UniversityofWales,Bangor,UK

出　　处：《复旦学报（自然科学版）》1998年第1期61-66,共6页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金;上海市教委重点学科项目

摘　　要：脉冲多普勒信号的频谱宽度可作为诊断血管疾病的一个重要参数．使用传统的短时快速傅里叶变换进行信号分析时，窗函数和信号非平稳性的展宽效应将导致频谱宽度估计值过大．为准确估计这一参数，提出了一种通过计算展宽函数频谱宽度并进行校正的方法．对已知特性的模拟脉冲多普勒信号的分析发现，这种方法降低了频谱宽度估计的误差，而且由于该方法仍然基于快速傅里叶变换，所以便于实时实现．The spectral bandwidth of pulsed Doppler signals can be used to diagnose vessel diseases. The bandwidth is overestimated as a result of window and nonstationarity broadening when the Doppler signal is analysed using the conventional short time Fourier transform.To estimate this index with a maximum accuracy,a correction method calculating the bandwidth of the broadening function is described in this paper. Using this method on simulated Doppler signals of known characteristics,a reduction in bandwidth estimation error can be found. Since this method is still based on the Fast Fourier Transform,it is easily implemented In real-time.

关 键 词：脉冲多普勒 频谱宽度 血管疾病 检测 诊断 

分 类 号：R445.1[医药卫生—影像医学与核医学] TB559[医药卫生—诊断学]