光子辅助宽带射频收发系统关键技术研究

发布时间：2018-07-05 01:36

本文选题：光学相控阵天线 + 光载射频链路　；参考：《浙江大学》2017年硕士论文

【摘要】：随着当今世界无线通信技术的飞速发展,人们对射频收发系统的要求也越来越高。不但要求能够支持大带宽,具有高灵敏度,还要求其能达到体积尽可能小,重量尽可能轻,功耗尽可能低以及成本尽可能低等多方面要求。面对这样的挑战,本文应用微波光子学的理论知识和实践经验来分析宽带相控阵雷达系统中所遇到的问题,采用ROF链路来对调制到光域上的宽带微波信号进行光学真延时,以期实现光子辅助宽带射频收发系统。论文首先从微波光子学的最基本构成——光载射频(Radio over Fiber,ROF)链路的基本组成元件出发,分析其性能对增益、噪声系数、无杂散动态范围等链路重要指标的影响,并讨论了链路指标的相关测试方法,从而保证系统进一步研究的正确选型和性能测试。接着探讨了基于窄带微波移相器的传统相控阵雷达和基于光学真延时线的光学相控阵雷达的波束成形原理及其波束特性,结果表明使用光学真延时线,可以很好解决宽带雷达的孔径渡越问题。然后本文重点设计并制备了基于MEMS光开关的二进制差分结构的可调光纤延时线,采用自行开发的高精度光纤研磨工艺,可将光纤长度精确控制在0.06mm以内,实现0.3ps的延时精度。在此基础上,论文最后提出了8×8的新型平面相控阵收发系统的构建方案,并详细设计了基于自研的可调光纤真延时线的移相网络,对方案进行了可行性分析和仿真,设计出的相控阵系统的扫描指向误差的球心角最大值为0.855°。另外再配合上接收系统中的光子信道化设计,可以降低对天线后端高速宽带ADC的需求。
[Abstract]:With the rapid development of wireless communication technology in the world, the demand of RF transceiver system is higher and higher. It is required not only to support large bandwidth and high sensitivity, but also to achieve as small volume as possible, weight as light as possible, power consumption as low as possible and cost as low as possible. In the face of this challenge, this paper applies the theoretical knowledge and practical experience of microwave photonics to analyze the problems encountered in wideband phased array radar system, and uses ROF link to implement optical true delay of broadband microwave signal modulated to optical domain. In order to achieve photon-assisted broadband RF transceiver system. In this paper, the most basic component of microwave photonics, Radio over RF (Radio over FiberROF) link, is introduced to analyze the influence of its performance on the gain, noise coefficient and non-spurious dynamic range of the link. The related testing method of link index is discussed, so as to ensure the correct selection and performance test of the further study of the system. Then the beamforming principle and beam characteristics of traditional phased array radar based on narrowband microwave phase shifter and optical phased array radar based on optical true delay line are discussed. The results show that the optical true delay line is used. It can solve the problem of aperture crossing of wideband radar. Then the adjustable fiber delay line with binary differential structure based on MEMS optical switch is designed and fabricated in this paper. The fiber length can be accurately controlled within 0.06mm and the delay precision of 0.3ps can be realized by adopting the self-developed high-precision optical fiber grinding technology. On this basis, the paper finally proposes a new type of planar phased array transceiver system with 8 脳 8, and designs a phase shift network based on self-developed true delay line of adjustable optical fiber in detail. The feasibility analysis and simulation of the scheme are carried out. The maximum value of the scanning pointing error of the phased array system is 0.855 掳. In addition, with the photon channelization design in the upper receiving system, the demand for high-speed wideband ADC at the back end of the antenna can be reduced.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN859

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