自具补偿互相关超声测距系统设计  

Design of Ultrasonic Ranging System with Self Compensation and Cross Correlation

作　　者：朱义德 杨瑞峰[1] 郭晨霞[1] 葛双超 ZHU Yi-de;YANG Rui-feng;GUO Chen-xia;GE Shuang-chao(State Key Laboratory of Electronic Testing Technology,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学电子测试技术国家重点实验室,山西太原030051

出　　处：《仪表技术与传感器》2021年第4期85-88,121,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金(41904080);山西省重点研发计划(201903D121118,201903D121060)。

摘　　要：结合超声波回波特性和互相关算法原理,设计了一套测距系统以降低超声测距的误差。使用QuartusⅡ软件和FPGA控制2套相同的测距装置,一组测量声速,作为另一组距离测量装置的补偿数据。根据FPGA的特性设计互相关算法模块,完成声波飞行时间的处理,并调整FPGA内部结构简化算法模块。测量结果表明,在不使用补偿传感器的情况下,所设计的测距系统在0~1500 mm的范围内,测距的绝对误差为±4 mm,相对误差低至0.2%。Based on the characteristics of ultrasonic echo and the principle of cross-correlation algorithm,a ranging system was designed to reduce the error of ultrasonic ranging.The QuartusⅡsoftware and FPGA were used to control two sets of same ranging system,the cross-correlation algorithm module was designed to complete the processing of acoustic flight time,and the internal structure of FPGA was adjusted to simplify the algorithm module.The measurement results show that the absolute error is±4 mm and the relative error is as low as 0.2%in the range of 0~1500 mm without the use of a compensating sensor.

关 键 词：超声波测距 自具补偿 互相关算法 半并行 飞行时间 现场可编程逻辑门阵列 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]