| 脉冲多普勒频谱宽度估计的一种校正方法 |
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| 引用本文： | 汪源源 Fish,PJ.脉冲多普勒频谱宽度估计的一种校正方法[J].复旦学报(自然科学版),1998,37(1):61-66. |
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| 作者姓名： | 汪源源 Fish PJ |
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| 作者单位： | 复旦大学电子工程系!上海，200433，SchoolofElectronicEngineeingScience，UniversityofWales，Bangor，UK |
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| 基金项目： | 国家自然科学基金，上海市教委重点学科项目 |
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| 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进行校正的方法。
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| 关 键 词： | 脉冲多普勒 频谱宽度 血管疾病 检测 诊断 |
Estimating the Bandwidth of Doppler Signals Using a Correction Method |
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| Wang Yuanyuan.Estimating the Bandwidth of Doppler Signals Using a Correction Method[J].Journal of Fudan University(Natural Science),1998,37(1):61-66. |
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| Authors: | Wang Yuanyuan |
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| Abstract: | 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. |
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| Keywords: | pulsed Doppler spectral bandwith short time Fourier transform correction |
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