基于LabVIEW和FPGA的多功能虚拟频谱分析仪设计

Design of a Virtual Spectrum Analyzer with Multi-function based on Lab VIEW and FPGA

基于虚拟仪器模块化的设计思想,设计出一种以FPGA为硬件基础,Lab VIEW为软件核心的多功能虚拟频谱分析仪。重点分析了硬件电路各个模块的设计方案和上位机软件数据处理方法。硬件电路包括对信号的调理、AD采集转换、存储及传输。另外,系统采用AD9288作为模数转换器,通过AD双路并行8位采样模式,可以提高系统的采样率。软件开发平台采用Lab VIEW,对数据进行滤波、加窗、FFT运算处理,并具有数字显示、图形绘制、存储和查看测试数据等功能。经测试该频谱分析仪稳定可靠,可用于高校实验教学中,具有一定实用价值。

This paper bases on modular design idea to design virtual instrument,and a multifunctional virtual spectrum analyzer is designed. In the system,the FPGA is used to be the basic hardware and the Lab VIEW is used as the core software. It specifically describes the design implementation for each module of the hardware circuit and the method of data analysis and processing in PC software. Hardware circuit includes the signal conditioning,AD collection and conversion,storage and transmission. In addition,AD9288 is used as AD converter. The system can improve the sampling rate through the AD dual 8-bit parallel sampling mode. Software development platform is compiled with Lab VIEW,which not only has ability to filter data,adds window,and complete FFT processing,but also can display digital,graphics rendering,store and view the test data. It is validated by testing that the spectrum analyzer is stable and reliable. Therefore,the system is with certain practical value and can be widely used in the experiment teaching of colleges and universities.