基于ARM的超声波法风速风向测量系统

摘要

设计了一套基于改进时差法的收发一体式超声波风速风向测量系统,以ARM芯片LPC2136为核心,采用了模块化的设计思想,根据电路功能详细设计了超声波收发、信号调理、数据量化、人机接口、系统电源与时钟及网络通信六大模块,同时在软件设计中采用了接收信号范围门与小波变换相结合的数据处理方法来精确定位超声波传播时间,对程序进行了整体优化.系统可实现风参数的精确测量、实时显示及与上位机PC的灵活通信等功能.%A integrated transceiver type ultrasonic wind speed and direction measurement system based on improved time difference method was designed. System hardware adopted modular design and took ARM chip LPC2136 as the core,which consists of six modules,including ultrasonic transceiver,signal conditioning,data quantization,human interface,system power and clock,and network communication according to the function. Furthermore, time frame to receiving signal and wavelet transform were adopted to accurately locate the ultrasonic propagation time in the program. Some functions were well realized in the system,such as real-time display of parameter, precise measurment of wind speed and wind direction, and flexible communication with PC.