基于两步相关法的大量程超声波测距技术  

Ultrasonic Distance Measurement with Large Sensing Range by Two Step Correlation Algorithm

作　　者：潘仲明[1] 简盈[1] 王跃科[1] 

机构地区：[1]国防科学技术大学机电工程与自动化学院仪器科学与技术系

出　　处：《电子测量与仪器学报》2006年第5期73-76,共4页Journal of Electronic Measurement and Instrumentation

摘　　要：在许多超声波测距算法中,互相关函数法是一种既适合于低信噪比信号,又适合于采用低采样速率的最佳算法。但是,超声波换能器的作用距离越长,所需的采样数据量也就越大,相应的计算时间也将随之急剧增加。为解决这一问题,提出了一种粗、精两步相关法来计算互相关函数,并由此确定超声波的射程时间,它显著地减少了超声波测距系统的数据处理时间,使得可以采用普通单片机来实现大量程超声波测距系统。Among the numeration proposed solutions in an ultrasonic range finding system, one of the best choices for low signal-to-noise ratio situations and low-sampling rate is the method based on the cross correlation function between the envelopes of the transmitted and received signals. However, the longer the sensing range of a transducer has, the more quantity of the sampled data is required, and hence the computing time is prolonged re- markably. In our case, the evaluation of time of flight （ToF） of ultrasonic was done by computing the cross-correlation function with coarse and fine steps, which would shorten the computing time significantly. As result, the algorithms presented can be easily adapted for generic single-chip microcomputer based on platforms to implement the ultrasonic range-finding systems with large stroke.

关 键 词：包络相关 快速算法 超声波测距 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]