基于DSP-FPGA平台的ADCP高沙流量测量系统

DSP-FPGA based ADCP system for high sediment concentration flow measurement

基于TMS320C6748与Spartan-6平台完成声学多普勒流速剖面仪(Acoustic Doppler Current Profiler, ADCP)的设计,并实现高含沙量情况下的水流流量精确测量。数字信号处理模块(Digital Signal Processing, DSP)完成上位机通信、系统控制、现场可编程门阵列模块(Field Programmable Gate Array, FPGA)交互、外设数据接入、信号数据处理等功能,FPGA完成发射信号调制、接收信号采集等功能。利用测量船搭载ADCP高沙流量测量系统在黄河流域进行测量,ADCP接入全球定位系统(Global Positioning System, GPS)和测深仪数据,在高含沙量水域进行断面流量测试,验证系统的可行性及测量精度。结果显示,在含沙量达到15.5 kg·m^(-3)的水文环境下,ADCP系统可正常稳定地完成测量作业,测量得到的流量相对误差为1.01%,满足高精度流量测量系统的要求。

An acoustic Doppler current profiler(ADCP) system based on TMS320C6748 and Spartan-6 is designed for accurate flow measurement under the condition of high sediment concentration. DSP is used to communicate with upper computer, control system, interact with FPGA, receive peripheral data and process signal data. FPGA is used to modulate the measured signal and receive acquired signal. In order to verify the feasibility and accuracy of ADCP system in the high sediment concentration environment, a flow measurement test is carried out in the Yellow River, where the survey vessel is used to install ADCP, which accesses GPS data and Echo sounder data by DSP. Test results show that, in the hydrological environment with sediment concentration of 15.5 kg·m^(-3), the ADCP system could measure the flow normally and stably, the relative error of flow measurement result is only 1.01%, which meets the requirements of high precision flow measurement system.