A New Time Domain Technique for Velocity Measurements Using Doppler Ultrasound
A New Time Domain Technique for Velocity Measurements Using Doppler Ultrasound
复制标题
使用多普勒超声进行速度测量的新时域技术
DOI：
10.1109/tbme.1985.325531
复制
发表时间：
1985
影响因子：
4.6
通讯作者：
S. Karr
中科院分区：
文献类型：
--
作者：
W. Barber;J. Eberhard;S. Karr
提出了一种确定相位相干脉冲多普勒系统中多普勒频移的新方法。在新的方法中，直接根据测量的多普勒信号的I和Q分量在时间域中给出多普勒频移。该算法基于一个将快变项和慢变项分开的瞬时相位变化率的表达式。它允许在每一项中分别进行噪声平滑。由于该技术仅依赖于时间域中的信号处理，因此它的实现比经典的傅里叶变换方法简单得多。此外，该算法可以给出非常精确的瞬时频率值，并且在较差的信噪比环境中优于傅里叶变换方法。给出了实验结果，证实了这种新的领域技术的优越性。
A new technique for determining the Doppler frequency shift in a phase-coherent pulsed Doppler system is presented. In the new approach, the Doppler frequency shift is given directly in the time domain in terms of the measured I and Q components of the measured Doppler signal. The algorithm is based on an expression for the instantaneous rate of change of phase which separates rapidly varying from slowly varying terms. It permits noise smoothing in each term separately. Since the technique relies solely on signal processing in the time domain, it is significantly simpler to implement than the classic Fourier transform approach. In addition, the algorithm can be shown to give rigorously accurate values for instantaneous frequency and outperform the Fourier transform approach in poor signal-to-noise environments. Experimental results are presented which confirm the superiority of the new domain technique.