基于摄谱术的光信号门控可调时频分析模型

A Model of Tunably Gated Optical Signal Time-Frequency Analysis Based on Spectrography

在光信号分析中运用时频分析方法,不但描述了信号频谱随时间的变化,而且显示了信号的能量密度.本文研究摄谱术并讨论魏格纳分布函数和光的时相关物理谱的联系.建立光信号门控可调时频分析模型,并利用LabVIEW进行仿真,分析了在不同门控时延条件下,不同速率的原始信号叠加噪声后的时频分布,对比了无噪声和时延的原始信号谱图,给出了不同条件下光信号较优的时解和频解.由仿真试验结果得出了基于摄谱术的门控可调时频分析模型是有效的光信号分析手段这一重要结论.

Time-frequency analysis method on optical signal can not only describe the variation of frequency going with the time, but also display the energy density of signal. We investigate the spectrography and the relationship between the Wigner distrbution function and the time-dependent physical spectrum of optical signal. A tunably gated optical signal time-frequency analysis model is proposed and a simulation is made using LabVIEW. Comparing the spectrogram of signal including noise in different time delay and velocity conditions with the original signal, a preferable time-frequency solution is obtained. From the simulation and its results, we conclude that the model could be efficiently employed in optical signal analysis field.