嵌入式电压监测仪表终端的设计数据采集模块

摘要本文以现代电压监测仪的设计为课题背景，根据数据采集模块设计的要求，以检测输入信号的电压幅值为研究目标，采用了软硬件相结合的方法，使其结构简单、灵活方便，完成电压检测的目的。电压检测关键在于频率检测，文中首先介绍了目前常用于频率测量的傅里叶变换法、三点法以及小波变换法等算法，阐述了通过幅值法实现电压幅值与相位的测量。
本文采用了以C语言实现FFT的设计思想，通过对程序的不断调试与修改，描述了整合了各个模块后系统的运行结果以及调试中出现的问题和相应的解决方法。并通过对结果的干扰分析，研究了噪音的来源和抑制的方法，减少了系统的误差。最后基于工程要求的考虑，总结了提高FFT处理速度及精度的几点建议。10941
关键词电压检测傅里叶变换噪音频率幅值
毕业设计说明书（论文）外文摘要
Title    Embedded Voltage Monitoring Instrumentation Terminal Design-Data Acquisition Module
Abstract
Based on modern voltage monitoring design as the subject background, according to the data acquisition module design, at the request of the input signal detection of voltage amplitude as the research target, using the combined method of software and hardware, make the structure is simple, flexible and convenient.
This article lies in frequency detection, this paper introduces the present method which is often used in frequency measurements of Fourier transform, three points and wavelet transform, this paper expounds the method of the amplitude method to implement voltage amplitude and phase measurement.
This paper adopted in C language implementation FFT design thought by commissioning and modifying program continuously, and introduces the integrated modules of the system and the operation results after commissioning in the problems and the corresponding solution. And through to the results of the interference analysis, this paper expounds the source of the noise and the method of suppression, reducing the error of the system. And based on the consideration of the project requirements, summarizes some suggestions of improving the processing speed.
Keywords Voltage detection Fourier transform FFT Noise Frequency    Amplitude
目   次
1    绪论    1
1.1    课题研究的背景及意义    1
1.2    电压监测仪国内外研究进展及现状    2
2    数据采集系统    4
2.1    数据采集系统的基本配置    5
2.2    数据采集系统的方案及比较    5
3    数据采集系统中用于频率检测的算法    6
3.1    小波变换    6
3.2    三点法    8
3.3    傅里叶变换法    10
4    快速傅里叶变换算法的实现    12
4.1    FFT实现流程图    13
4.2    FFT求取频率、幅值、相位的方法    14
4.3    被测信号的电压测量    15
4.4    FFT理论结果与实际结果分析    17
4.5    Microsoft Visual C++调试及调试中的问题描述    19
4.6    关于噪音影响的分析    21 嵌入式电压监测仪表终端的设计数据采集模块:http://www.youerw.com/zidonghua/lunwen_10186.html