基于光子学原理的射频对消技术研究

发布时间：2018-03-24 03:14

本文选题：微波光子学　切入点：射频对消　出处：《南京航空航天大学》2016年硕士论文

【摘要】：在连续波雷达和全双工无线通信系统中,由于系统工作在同时收发模式,当收发南线间的距离较近时,会有部分发射信号传输到接收南线上造成系统自干扰,从而导致一系列严重的后果。因此如何抑制泄漏信号,提高系统隔离度已成为提升系统性能的一个关键因素。为了解决这一问题,国内外学者提出了多种解决方案,其中最具发展潜力的是射频对消技术。然而由于各类电子器件的工艺水平受到限制,使得系统调节精度存在电子瓶颈,对消深度无法提升,于是人们最近又提出了光子射频对消技术。受益于光学器件工作宽带南,调节精度高等优良性能,光子对消系统的对消深度相比电子系统南南提升。在这一技术背景下,我们对光子射频对消技术进行深度研究。主要包括以下三个方面:1.在理论方面,对射频对消技术的原理进行公式推导和理论分析,提出了对消性能的评价指标,并用MATLAB仿真技术绘制了等对消深度曲线图,更直观的分析了幅度和相位误差对系统对消深度的影响,为下文的设计提供理论基础。2.分析现有光子对消方案的不足,在解决对消技术中存在的色散引发的信号功率衰落问题方面,提出了基于偏振调制器的光子射频对消系统。用偏振调制器实现对消信号与泄漏信号的反相调制,用可调光延时线和可调光衰减器实现信号延时和幅度的匹配,从而实现对消。先从原理分析了偏振调制系统实现对消的过程,接着分析偏振调制器实现色散补偿的原理,最后搭建实验系统,成功实现了泄漏信号的对消和功率衰落点的调节。3.在解决泄漏信号多径传输干扰方面,提出了基于色散延时的光子射频对消系统。同样用偏振调制器实现对消信号与泄漏信号的反相调制,不同之处在于通过调节光源波长和输出光功率实现信号的等幅反相状态,实现对消。先从原理分析可调谐色散补偿模块的工作过程,得出延时与色散值之间的关系。接着分别对不同路径干扰情况下的对消过程进行分析,再进行实验,成功测试了系统在不同路径干扰下的对消深度。最后,测试了链路的一些基本性能参数,并与已有方案的性能相比,得出所提方案的优缺点。
[Abstract]:In the continuous wave radar and full duplex wireless communication system, because the system works in the mode of simultaneous receiving and sending, when the distance between the southern lines is close, some of the transmitted signals will be transmitted to the receiving southern line, which will cause system self-interference. Therefore, how to suppress leakage signals and improve system isolation has become a key factor to improve system performance. In order to solve this problem, domestic and foreign scholars have put forward a variety of solutions. The most promising one is radio frequency cancellation technology. However, due to the limitation of the process level of all kinds of electronic devices, there is an electronic bottleneck in the adjustment accuracy of the system, and the cancellation depth cannot be improved. The photonic radio frequency cancellation technology has been proposed recently. The photonic cancellation system has a higher cancellation depth than the electronic system because of the excellent performance of optical devices, such as wide band south, high regulation precision, etc. In this technical background, We study the photonic radio frequency cancellation technology in depth. It mainly includes the following three aspects: 1. In theory, the formula derivation and theoretical analysis of the radio frequency cancellation technology are carried out, and the evaluation index of cancellation performance is put forward. The curve of equal cancellation depth is drawn by MATLAB simulation technology, and the influence of amplitude and phase error on the cancellation depth is analyzed more intuitively, which provides the theoretical basis for the following design. 2. The deficiency of existing photon cancellation scheme is analyzed. In order to solve the problem of signal power fading caused by dispersion in cancellation technology, a photon radio frequency cancellation system based on polarization modulator is proposed. The polarization modulator is used to realize the inverse modulation of cancellation signal and leakage signal. The signal delay and amplitude matching are realized by using the adjustable light delay line and the adjustable optical attenuator, and the cancellation is realized. Firstly, the process of the polarization modulation system is analyzed from the principle, and then the principle of the polarization modulator to realize the dispersion compensation is analyzed. Finally, the experimental system is set up, which successfully realizes the cancellation of leakage signal and the adjustment of power fading point .3. in solving the multi-path transmission interference of leakage signal, A photon radio frequency cancellation system based on dispersion delay is proposed. The polarization modulator is also used to realize the inverse phase modulation of the cancellation signal and the leakage signal. The difference lies in the realization of the state of equal amplitude inverse phase of the signal by adjusting the wavelength of the light source and the output optical power. The working process of the tunable dispersion compensation module is analyzed from the principle, and the relationship between delay and dispersion value is obtained. Then, the cancellation process under different path interference is analyzed, and then the experiment is carried out. The cancellation depth of the system under different path interference is successfully tested. Finally, some basic performance parameters of the link are tested, and compared with the performance of the existing scheme, the advantages and disadvantages of the proposed scheme are obtained.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN761;TN911.7

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