NONSTATIONARITY BROADENING IN PULSED DOPPLER SPECTRUM MEASUREMENTS
NONSTATIONARITY BROADENING IN PULSED DOPPLER SPECTRUM MEASUREMENTS
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DOI：
10.1016/0301-5629(91)90122-d
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发表时间：
1991-01-01
影响因子：
2.9
通讯作者：
FISH, PJ
中科院分区：
文献类型：
--
作者：
FISH, PJ
来自脉冲超声多普勒仪器的动脉信号的频谱的常规测量使用加窗的顺序数据段。 假设多普勒信号在每个段的持续时间内是静止的。 它示出在这里，这种假设往往是不合理的，并在数据段期间的平均频率变化的影响进行了研究，为不同的窗口和平均频率的变化率。 对于每种窗口类型和频率变化率，都存在给出最大频谱分辨率的数据段长度。
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.