【作者】 蔡国英；

【导师】 张宏群；

【作者基本信息】 南京信息工程大学 ， 信号与信息处理， 2008， 硕士

【摘要】 高频实验室是工科高等院校必备的实验教学设施。高频实验室存在着仪器种类多、成本高、用途单一等缺点。而虚拟仪器在很大程度上能够解决以上困境,并且有利于从整体上改善办学条件和提高教学水平。通常虚拟仪器系统由数据采集、数据分析、结果输出显示组成,数据采集部分通过硬件来实现,数据分析和结果输出完全由计算机的软件系统来完成。本文硬件选用NI公司生产的数据采集卡PC—6251结构,软件利用图形化编程语言LabVIEW为开发平台,从硬件结构和软件两个方面实现高频虚拟实验室仪器的设计。本文在分析与研究虚拟仪器、虚拟仪器开发环境—LabVlEW、虚拟仪器硬件系统的基础上,重点依据高频放大器、调幅及检波、调频及鉴频、调相及鉴相原理,利用LabVIEW编程语言,结合编程思路与方法,对虚拟高频放大器、虚拟调幅及检波器、虚拟调频及鉴频器、虚拟调相及鉴相器进行设计与仿真。本文采用LabVIEW编程语言对虚拟信号发生器、虚拟示波器、虚拟频谱分析仪进行设计,其可以实现信号生成、数据采集、数据处理、数据读取和存储、波形显示等功能。本文结合虚拟仪器的设计,总结了设计与研究过程中遇到的难题并指出了解决方法。本文实现了虚拟仪器的高频虚拟实验室的的基础建设,使之成为现有实验教学的有益补充,从而大大提高实验教学的灵活性和适应性。更多还原

【Abstract】 High frequency lab is the necessary institutional of experimental course in engineering colleges. It has some shortcomings, including a variety of apparatus, high cost, single use, etc. Virtual instrument can solve that difficult position and be beneficial to improve the whole educational condition and teaching level. Usually virtual instrument system is made up of data acquisition, data analysis and output display. Except some part of data acquisition is completed by hardware, the others are all realized by software. So the paper describes the design and realization of the high-frequency virtual lab instruments from hardware and software, using the DAQ PC—6251 of the NI company as the hardware, and graphic program language LabVIEW as the development software.Based on the analysis and research of virtual instrument, the virtual instruments developing environment—LabVIEW and virtual instrument hardware systems , virtual high frequency amplifier、virtual AM and demodulation、virtual FM and frequency detection, virtual PM and phase detection are designed and simulated with the new programming idea and method under LabVIEW in this paperAlso in this paper ,virtual signal generation, virtual oscilloscope, virtual spectrum analyzer are.designed with labview, which can realize signal generation, data acquisition, data processing, data reading and storing, waveform display, and so on.Combining with virtual instrument scientific design, the problems are summarized and solutions are pointed out at last. The basic construction of the high-frequency virtual lab instruments are realiseed in this paper ,which is the useful supplement to laboratory teaching and could greatly improve the flexibility and adaptability of laboratory teaching.更多还原