一种基于分数阶傅立叶变换的超声编码激励方法  

A method of ultrasonic coding excitation based on Fractional Fourier Transform

作　　者：刘贵栋[1] 沈毅[2] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001 [2]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《声学技术》2008年第3期347-350,共4页Technical Acoustics

摘　　要：将编码激励技术应用到医学超声成像系统中,选择和设计合适的发射编码和脉冲压缩方法非常重要。文中提出采用加Tukey窗的Chirp信号作为发射脉冲,同时采用分数阶傅立叶变换的进行脉冲压缩的编码激励方法。将该方法与传统方法进行了比较研究,实验结果表明:文章提出的基于分数阶傅立叶变换的编码激励方法在先验性方面优于传统方法。Coding excitation technique has been applied to medical ultrasonic imaging system. It is important that the transmitting codes and the corresponding pulse compression method must be chosen appro- priately. In this paper the Tukey-windowed Chirp signal is adopted as a transmitting pulse, and the pulse compression method based on Fractional Fourier transform is proposed. Comparison of this method with traditional methods has been made. Simulation results show that the method of coding excitation based on Fractional Fourier transform is better than the traditional method in the aspect of needing less former information

关 键 词：分数阶傅立叶变换 编码激励 脉冲压缩 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]