摘要
开发了一套基于FPGA的超声波测距系统,利用FPGA的工作特性,设计了流水线结构的互相关法测距模块,实现了超声波信号和传输时间的实时快速采集与处理。试验分析了不同测量距离和不同测量角度情况下的测距精度,并与普通峰值法测量结果对比,结果表明:随距离和角度的增大,测距误差增大,标准差增大;互相关法相比峰值法,检测精度更高,抗干扰能力更强。
This paper designed an ultrasonic ranging system based on FPGA.Taking advantage of the rich resources of FPGA,it designed the cross-correlation ranging module with pipeline structure,and realized real-time acquisition and processing of ultrasonic signal and transmission time.To analyze the influences of the distance and the relative angle between the receiver and the transmitter on ranging accuracy and compare two methods＇ advantages,two groups of experiments were accomplished.The experimental results show that both the range error and standard deviation increase along with the increase of distance and relative angle;cross-correlation method has higher precision and better anti-interference capability compared with peak method.
出处
《仪表技术与传感器》
CSCD
北大核心
2013年第6期86-89,共4页
Instrument Technique and Sensor
关键词
超声波测距
FPGA
流水线设计
峰值法
互相关法
ultrasonic ranging
FPGA
pipeline design
peak method
cross-correlation method
