基于广义S变换的超声多普勒信号瞬时速度提取  

Extraction of instantaneous velocity in ultrasonicdoppler signal based on generalized Stransform

作　　者：王源果 俞文力 郑驰超[1] 赵巍[1] 彭虎[1] 

机构地区：[1]合肥工业大学医学工程学院,安徽合肥230009

出　　处：《中国科学技术大学学报》2016年第2期130-137,共8页JUSTC

基　　金：国家自然科学基金(61172037);国家自然科学基金青年科学基金(61201060);国家重大科学仪器设备开发专项项目(2013YQ200607;2012YQ200224)资助

摘　　要：多普勒回波信号中瞬时速度的提取对目标的运动状态分析具有重要意义,但由于其非平稳性的限制,一般的分析方法无法提供足够的时频聚焦性能.针对这个问题提出了基于广义S变换的超声多普勒信号瞬时速度提取方法,并进行了计算机仿真和实验验证.在仿真上设定超声波入射一个往复运动的质点得到了多普勒回波信号,在实验上设计了一个往复运动的机械装置,超声探头发射超声波并接收回波信号.通过对回波信号进行广义S变换,提取了信号的瞬时频率,并计算得到瞬时速度.计算机仿真和实验研究表明了广义S变换在超声多普勒信号中运动目标的瞬时速度提取上的有效性.Extraction of instantaneous velocity in doppler echo signal is of great significance to the analysis of target motion state.However,general analytical methods can not provide sufficient time-frequency focusing performance due to the restriction of nonstationarity.A method based on generalized Stransform(GST)was suggested to extract instantaneous velocity from the ultrasonic doppler signal,and computer simulation and experiment verification were carried out.In the simulation,a model system was set up,which contains a reciprocating dot.The doppler echo signal was produced by transmitting ultrasonic waves to the reciprocating dot.In the experiment a machinery device with reciprocating movements was designed,which gets echo signal by transmitting ultrasonic waves.The instantaneous frequency was obtained by processing the echo signal with GST and the instantaneous velocity was calculated.Thecomputer simulation and experiment demonstrate the effectiveness of extraction of instantaneous velocity of the moving target in the doppler echo signal by GST.

关 键 词：多普勒 广义S变换 瞬时速度 往复运动 

分 类 号：TN911.7[电子电信—通信与信息系统]