【摘要】 本文介绍了一种基于FFT谱分析法分析相位差的方法,即通过提取基波参数,求取被测信号的相位差。相位差的求取在分析系统动态特性时具有重要的意义,如何准确的计算出两信号的相位差是本文研究的重点。本文提出了提高相位差测试精度的方法以及如何解决整周期采样的问题。应用图形化编程语言LabVIEW实现算法仿真,大大减少了程序的开发时间,具有较强的可读性。该算法实现简单、测试精度高。仿真计算验证了算法的有效性,为系统频率特性的研究提供了坚实的理论基础。更多还原

【Abstract】 This paper introduces a measuring method for phase difference based on FFT.Ac- cording to withdraw the group wave parameter measure the phase difference of the signal.It is important to analyze the dynamic characteristic of the system.How to acquire the phase differ- ence exactly is the emphasis of this paper.And presents a correction method to implement preci- sion,and a solution to resolve the problem of the integer-period sampling.Using the graphical programming language which is implement the simulation can reduce the time greatly.The al- gorithm is easy to be realized and high measuring accuracy.The simulation proves its effective- ness,which provides the base for dynamic characteristic.更多还原