基于时间互相关的超声测距信号获取方法  

Method Acquiring Ultrasonic Distance Measuring Signal Based on Time Cross-correlation Algorithm

作　　者：彭映成[1,2] 钱海[2] 黎小毛[2] 朱宝良[2] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084 [2]西北核技术研究所,陕西西安710024

出　　处：《仪表技术与传感器》2014年第6期126-127,130,共3页Instrument Technique and Sensor

摘　　要：为了解决基于超声脉冲走时法首波难以获取的问题,提出了一种基于时间互相关算法的超声走时获取方法。根据标准信号的自相关和另一同频延迟信号的互相关之间的时延,得到超声发射与接收信号间的时差。该方法无需判断超声接收信号首波位置和获取该环境下的声速,实现了较高精度的超声测距。To solve the problem which the first wave is difficult to obtain in the method of ultrasonic pulse travel time,a method based on time cross-correlation was proposed to acquire the ultrasonic signal travel time.According to the time delay of the standard signal autocorrelation and the cross-correlation with another delay signed of the same frequency,we get the time difference between the transmitting and receiving ultrasonic signals.The method achieves ultrasonic distance measuring of higher accuracy without both the decision of the first wave position of ultrasonic receiving signal and the acquisition of the sound velocity under the condition.

关 键 词：超声波 时间互相关 声速 峰值 高精度 

分 类 号：TB551[理学—物理]