C波段微波信号光纤稳相传输技术研究

发布时间：2018-08-08 20:59

【摘要】：微波信号光纤稳相传输技术是研究通过光纤链路来传输高相位稳定度微波信号的技术,其在基础科学研究、深空无人网络等领域有着快速发展。C波段微波信号作为下行频段在3.7GHz~4.2GHz的信号,常用于卫星通信下行频段传输的信号频段。然而,在信号传输过程中,系统各部分组件受外部环境因素变化的影响,会使远端接收到的微波信号产生相位抖动,影响信号准确性。光纤作为微波信号稳相传输系统的主要媒介,具有低损耗、高带宽、不易受电磁干扰、成本低等众多特性,同时也成为长距离信号传输系统中信号相位抖动的主要原因,所以在光纤传输之前要实时快速的补偿光纤产生的相位延时使远端恢复出的信号相位稳定不变。在中心端的实时相位检测和相位补偿是微波信号稳相传输系统的关键问题。本论文先是将近年来国内外的微波信号光纤稳相传输系统中各种思路展开的设计方案做了分析总结和比较,对他们的系统性能和结构作了对比评价,引出了现有方案的众多问题所在。然后讨论了光纤稳相传输系统主要组件对信号传递相位变化的影响,给出了信号稳定度的描述方式。研究了一种副载波复用、相位共轭稳相的信号传输稳相系统方案,从原理上证明了方案适用于信号的稳相传输,阐述了各部分组成,评价了该方案相位补偿范围大和相位补偿速度快的特点。针对微波信号光纤传输系统的主要组件的温度特性对信号相位的影响,在实验方案中总结分析得到了各部分对信号相位噪声影响程度较小,计算得到光纤随温度变化的延时系数达到39.5ps km1 C1--???,是信号相位波动的主要原因。然后研究了一种对环路电混频的微波信号传输方案进行改进,通过探测信号的光纤长距离往返传输,在相位差检测中得到信号在光纤传输中的相位波动,控制光程补偿器件消除相位噪声,达到最终远端信号的相位稳定。
[Abstract]:The technology of optical fiber stabilized phase transmission of microwave signal is to study the transmission of high phase stability microwave signal through optical fiber link, which is studied in basic science. Deep space unmanned network and other fields have a rapid development. C-band microwave signal as the downlink frequency band in the 3.7GHz~4.2GHz signal, often used in satellite communications downlink band signal frequency band. However, in the process of signal transmission, the components of the system are affected by the change of external environment factors, which will cause phase jitter in the microwave signal received from the far end and affect the accuracy of the signal. As the main medium of microwave signal phase stabilization transmission system, optical fiber has many characteristics, such as low loss, high bandwidth, not easy to be interfered by electromagnetic, low cost and so on. At the same time, it also becomes the main reason of signal phase jitter in long distance signal transmission system. Therefore, the phase delay generated by the fiber must be compensated in real time and fast before the fiber is transmitted, so that the phase of the signal recovered from the far end is stable and invariant. Real-time phase detection and phase compensation at the center end are the key problems in the phase-stabilized transmission system of microwave signal. In this paper, the design schemes of microwave signal fiber stabilized phase transmission system in recent years are analyzed, summarized and compared, and their system performance and structure are compared and evaluated. It leads to many problems of the existing scheme. Then, the influence of the main components of the fiber stabilized phase transmission system on the signal transfer phase change is discussed, and the description of the signal stability is given. In this paper, a scheme of signal transmission and phase stabilization system with subcarrier multiplexing and phase conjugation stabilization is studied. It is proved in principle that the scheme is suitable for the stable phase transmission of signal, and the composition of each part is expounded. The large range of phase compensation and the fast speed of phase compensation are evaluated. In view of the influence of temperature characteristics of the main components of microwave signal optical fiber transmission system on the signal phase, the conclusion and analysis of the experimental scheme show that the influence of each part on the signal phase noise is relatively small. The delay coefficient of the fiber with temperature is calculated to be 39.5ps km1 C1-, which is the main reason of the signal phase fluctuation. Then, an improved microwave signal transmission scheme of loop electric mixing is studied. The phase fluctuation of the signal in fiber transmission is obtained in the phase difference detection by detecting the signal from the fiber to and from the long distance. The phase noise is eliminated by controlling the optical path compensation device, and the phase stability of the final remote signal is achieved.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.11

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