基于FPGA的超声波测向装置设计

Design of ultrasonic direction testing device based on FPGA

提出了一种利用超声波的多普勒效应来测定电力线路施工中张力放线方向的方法。实现频移测量的核心器件是FPGA。该器件通过比较测量发射和接收超声波信号的波长来输出方向信号,以供后续的激光测速测长装置使用,两者共同完成对放线长度的测量。详细介绍了FPGA的内部设计和工作原理,并对其误差和精度进行了分析。仿真结果证实了该方法的有效性。

A method is presented here which is about utilizing doppler effect of ultrasonic to monitor the laying direction of overhead conductor. The central implementation unit of the frequency shift measurement is a FPGA device which compares the wavelength difference of the ultrasonic signal＇s emitted and received to decide the direction signal output. This output signal is to be used by the laser velocity and length measuring equipment. The two devices together complete the process of conductor-length measurement. Internal design and working principle of the chip are introduced. Its error and precision are analyzed. The simulation result demonstrates the validity of the method.