Abstract: The ultrasonic signal measurement system is designed by virtual instrument for better target detection. The system structure and working principle of each module are described. As the distance measurement is the key technology of target detection, mainly from the view of the signal processing, two kinds of envelope-based improved algorithms are proposed based on analyzing conventional algorithm of ultrasonic Time-of-Flight（TOF） measurement, and they are achieved by LabVIEW. Finally, the experiments including ultrasonic signal acquisition, storage, characteristics and amplitude analysis of echo signal and distance measurement analysis are accomplished by the measurement system. The results show that the system can get signal analysis and processing intuitively, accurate distance to provide the basis platform for post target identification.

Key words: ultrasonic signal, virtual instrument, Time of-Flight（TOF）, distance measurement, LabVIEW

摘要： 为更好地进行目标探测，利用虚拟仪器技术设计了超声信号测量系统，介绍了系统的构成和各模块工作原理。测距是目标探测的关键技术，重点从信号处理的角度，在分析传统超声射程时间TOF测量算法的基础上，提出了两种基于包络的改进算法，并利用LabVIEW软件来实现。最后利用超声信号测量系统完成超声波信号的采集、存储，回波信号的特征和幅值分析、测距分析等实验，结果表明该系统能对超声信号进行直观信号分析处理，测距准确，为后期目标识别提供了基础平台。

关键词: 超声信号, 虚拟仪器, 射程时间（TOF）, 测距, LabVIEW软件