单通带可调谐微波光子希尔伯特变换技术及其在信号处理中的应用

Hilbert transform has a very important role in signal analysis and processing applications, it constraints the relationship between the real and imaginary parts or the magnitude and phase response of the system transfer function. This project aims to build up a broadband tunable bandpass microwave Hilbert transformer system based on PS-FBG phase shift combined single-pass filtering effect of tunable microwave photonic band filter system.By analyzing the light polarization effects processing and integral transformation under the square-law detection with signal dispersion induced by the DCF, researchers will investigate the conversion mechanism between the phase shift of broad spectrum light source and the corresponding phase shift of the microwave band-pass transformer,besides we will also explore the characteristics between the spectral width of the spectrum , dispersion effects, polarization disorder parameters which will affect the output response of this microwave Hilbert transform systems. The technology has passband tunable frequency response with non-cyclical characteristics,which is meaningful in the multi-channel microwave communications transmission environment for channel selection and pass-band analysis. Furthermore, we will demonstrates the system effectivity by comparing the simulation and experimental results,which is very important for this new microwave signal processing technology to be applied in the field of electronic warfare, ROF and other communications, and precision measurement.

希尔伯特变换在信号分析与处理中有着十分重要的应用，它约束着系统传递函数实部和虚部之间或者幅度和相位之间的相互关系。本项目针对目前无有效方法实现宽带可调带通微波希尔伯特变换系统的问题，以基于相移光纤光栅的可调单通带微波光子滤波系统的幅频、相频响应为研究对象，通过分析光信号的偏振处理与平方律检波下色散引入的积分变换效应，研究宽谱光源的光谱相移与对应微波通带相移之间的转换机理，探索光谱谱宽、色散效应、偏振失调等参数对产生带通微波希尔伯特变换输出响应的影响，预期最终建立具有单通带可调谐特性的微波希尔伯特变换系统。该系统具有通带可调谐、频响无周期性的特点，在多信道微波通信传输环境下对信道选择与通带分析有着重要意义。并利用该系统对任意典型带通信号进行带通希尔伯特变换，与仿真数据对比，验证系统的有效性。从而为这一新型微波信号处理技术在电子对抗、ROF通信和精密测量等领域的拓展应用提供必要的科学依据.

希尔伯特变换在信号分析与处理中有着十分重要的应用，它约束着系统传递函数实部和虚部之间或者幅度和相位之间的相互关系。本项目研究了一种基于宽谱光源移相陷波并通过偏振处理结合色散积分效应产生的可调谐单通带微波光子希尔伯特变换滤波技术，利用该技术拟在宽谱微波频段内实现了对任意通带微波信号的带通希尔伯特变换，从而能够克服目前全光希尔伯特变换无法直接用于微波信号处理的缺陷，并且通过正交偏振复用，使系统具有无系统基频响应、无周期性频谱响应的优势，保证了通道选择的单一性与系统宽带可调谐的频谱覆盖范围。项目以基于相移光纤光栅的可调单通带微波光子滤波系统的幅频、相频响应为研究对象，通过分析光信号的偏振处理与平方律检波下色散引入的积分变换效应，研究了宽谱光源的光谱相移与对应微波通带相移之间的转换机理，探索光谱谱宽、色散效应、偏振失调等参数对产生带通微波希尔伯特变换输出响应的影响，最终建立具有单通带可调谐特性的微波希尔伯特变换系统。该系统针对扩频通信信号在0~40GHz带宽范围实现了通带宽度可调谐、中心频响无周期干扰的希尔伯特变换处理。研究成果适用于多信道的微波传输通信系统中，对不同信道可单独实现带通实时H变换处理，可在电子对抗、ROF通信和精密测量等领域中进行拓展应用。