NONSTATIONARITY BROADENING IN PULSED DOPPLER SPECTRUM MEASUREMENTS

被引：53
|
作者：
FISH, PJ
机构：
[1] School of Electronic Engineering Science, University of Wales-Bangor, Bangor, Gwynedd Wales LL57 1UT, Dean Street
来源：
ULTRASOUND IN MEDICINE AND BIOLOGY | 1991年 / 17卷 / 02期
关键词：
DOPPLER ULTRASOUND; ULTRASONIC DOPPLER SHIFT SPECTRUM ANALYSIS; SPECTRUM; SPECTRAL ESTIMATION; DOPPLER POWER SPECTRUM; FAST-FOURIER TRANSFORM (FFT); BLOOD FLOW; SIGNAL PROCESSING; STATIONARY; NONSTATIONARY; CYCLO-STATIONARY; WINDOWS; STATIONARY PHASE;
D O I：
10.1016/0301-5629(91)90122-D
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
Conventional measurement of the spectrum of arterial signals from the pulsed ultrasonic Doppler instrument uses windowed, sequential data segments. The Doppler signal is assumed stationary for the duration of each segment. It is shown here that this assumption is often unreasonable and the effect of mean frequency variation during the data segment has been investigated for different windows and rates of change of mean frequency. A data segment length giving maximum spectral resolution is shown to exist for each window type and rate of frequency change.
引用
收藏
页码：147 / 155
页数：9
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