【作者】 陈勇；

【导师】 张崇富；

【作者基本信息】 电子科技大学 ， 工程硕士（专业学位）， 2021， 硕士

【摘要】 现代民用和军事通信中射频信号的传输处理带宽越来越高,这对射频信号接收机的动态范围、接收灵敏度、瞬时带宽提出了更高要求。将微波光子学应用于宽带射频信号的传输和处理成为重要手段之一,微波光子辅助信道化接收技术由于低损、抗电磁干扰和并行处理等优势受到广泛关注。已有的微波光子辅助的射频信号信道化接收方案存在接收频段受限、信道化效率不足等问题,本论文将重点开展如下研究工作:1)微波光子辅助的多波段微波信道化技术;2)基于相干检测的高效微波光子信道化接收技术。本文主要研究工作及贡献如下:1.针对已有信道化方案的接收频段受限,提供了一种微波光子辅助多波段微波信号信道化接收方案,其中频谱信息由瞬时频谱分析获得。与已有的方法相比,研究改进的方案可以在宽带信号频谱信息未知的情况下实现对多波段微波信号的信道化接收。研究结果表明,通过瞬时频谱分析获得频谱信息,进一步控制相干信道化过程完成了位于2-6GHz和26-30GHz的不同波段4GHz宽带信号的接收,实现4信道等效28信道接收机,减少光电器件的数量。2.针对相干信道化效率不足,研究了基于滤波器组和偏振复用的两种高效微波光子相干信道化方案。提出了改进滤波器组设计的相干信道化接收方案,通过对相干信道化所需的光载波和本地振荡之间的相对频率的精心设计,以及对最后的滤波器组进行相应的设计,实现宽带信号的信道化接收,仿真结果证明了仅用一根光载波的前提下,将宽带信号信道化为八个子信道的高信道化效率。提出了利用偏振复用改进光载波和本振设计的相干信道化接收方案,利用了偏振复用带来的频谱重叠特性。仿真结果表明一对具有正交偏振的光载波和一对线偏振本振,就可以将宽带信号同样信道化为八个子信道,且同时减少了信道化对本振的数量需求,且信道化之后信噪比只下降了3.33%。更多还原

【Abstract】 The transmission and processing bandwidth of radio frequency signals in modern civil and military communications is getting higher and higher,which places higher requirements on the dynamic range,receiving sensitivity,and instantaneous bandwidth of radio frequency signal receivers.The application of microwave photonics to the transmission and processing of broadband radio frequency signals has become one of the important means.Microwave photonics-assisted channelization receiving technology has attracted wide attention due to its advantages of low loss,anti-electromagnetic interference and parallel processing.Existing microwave photon-assisted radio frequency signal channelization reception schemes have problems such as limited reception frequency bands and insufficient channelization efficiency.This paper will focus on the following research work: 1)photon-assisted multi-band microwave channelization technology;2)high-efficiency microwave photonic channelized receiving technology based on coherent detection.The main research work and contributions of this paper are as follows:1.In view of the limited reception frequency band of existing channelization schemes,a photon-assisted multi-band microwave signal channelization reception scheme is provided,in which the spectrum information is obtained by instantaneous spectrum analysis.Compared with the existing methods,the research and improvement scheme can realize the channelized reception of multi-band microwave signals when the spectrum information of the broadband signal is unknown.The research results show that the spectrum information is obtained through instantaneous spectrum analysis,and the coherent channelization process is further controlled to complete the reception of4 GHz linear chirp signals in different bands at 2-6GHz and 26-30 GHz,realize a 4-channel equivalent 28-channel receiver,reducing the number of optoelectronic devices.2.Aiming at the insufficient efficiency of coherent channelization,two high-efficiency microwave photonic coherent channelization schemes based on filter bank and polarization multiplexing are studied.A coherent channelized reception scheme with improved filter bank design is proposed.Through careful design of the relative frequency between the optical carrier and local oscillation required for coherent channelization,and the corresponding design of the final filter bank,broadband is achieved.The channelized reception of the signal,the simulation results proved the high channelization efficiency of channelizing the broadband signal into eight sub-channels under the premise of using only one optical carrier.A coherent channelized reception scheme using polarization multiplexing to improve the design of optical carrier and local oscillator is proposed,and the spectrum overlap caused by polarization multiplexing is used.Simulation results show that a pair of orthogonally polarized optical carriers and a pair of linearly polarized local oscillators can channel wideband signals into eight sub-channels,and at the same time reduce the number of local oscillators required for channelization,and After channelization,the signal-to-noise ratio only dropped by 3.33%.更多还原