结构健康监测系统中FIR滤波器的设计

Design of FIR Filter in Structural Health Monitoring System

针对结构健康无线传感器网络监测系统中,需要对节点数据进行预处理问题,采用FPGA(field-programmable gate array)为硬件平台,设计了FIR(finite impulse response)数字滤波器,对节点的数据进行数字滤波处理.设计中利用MATLAB/Simulink、DSP Builder软件对数字滤波器进行建模、滤波系数计算、系统模型仿真和生成相应的VHDL工程文件;利用Quartus-II软件对工程文件进行综合、编译和调试,并且生成相应的底层原理图模块.通过对1 kHz和4 kHz的两个正弦波混合信号进行仿真滤波表明,4 kHz的高频干扰信号被有效地滤除,实现了FIR滤波器的性能.将生成的VHDL代码下载到FPGA中,实现了基于FPGA的FIR滤波器设计.

In wireless sensor networks for structural health monitoring system,we need to preprocess the data of node,so we designed a FIR（Finite Impulse Response） digital filter to node data processing digital filtering.In this design,we use the FPGA（Field-Programmable Gate Array） hardware platform.This design uses MATLAB/Simulink,DSP Builder software to model the digital filter,calculate filter coefficients,simulate system model and generate the corresponding VHDL project files.Quartus-II software is used to synthesis,compiler and debug the project file,and generates the corresponding underlying schematic modules.We simulate and filter the two mixed-signal sine wave of 1 kHz and 4 kHz.The results show that 4 kHz high-frequency interference signal is effectively filtered out to achieve the performance of the FIR filter.The design of FIR filter based on FPGA is achieved by downloading the generated VHDL code to the FPGA.