基于超再生体系结构的电小天线脉冲收发技术

发布时间：2018-03-19 02:08

  本文选题：脉冲无线电　切入点：电小天线　出处：《南京航空航天大学》2014年硕士论文　论文类型：学位论文

【摘要】：脉冲无线电系统在短距离通信、雷达检测、定位测距等领域有着十分广泛的应用。然而,短时脉冲信号的宽带特性对射频前端和天线设计构成了很大的挑战。传统的射频无线系统采用频域设计方法,在给定频率范围和输入功率条件下,将天线和射频前端电路作为线性时不变单元加以分析和设计,理论上系统性能存在增益-带宽限制,导致了宽带脉冲无线系统设计和实现上的诸多困难。本文针对脉冲信号的时域特性以及电小天线的输入阻抗和辐射特性,研究和设计实现了一种基于超再生体系结构的电小天线收发脉冲信号技术方案。与传统的频域设计方法不同,本文提出的技术方案从时域角度出发,通过电小天线等效电路建模,实现超再生式射频前端电路和电小天线一体化设计,提供了脉冲无线电小型化、低成本和低复杂度的一种新型实现途径。具体而言,本文工作的主要内容和成果包括:(1)利用电小天线输入阻抗特性,将电小天线作为超再生电路中振荡回路的一部分,设计形成了一种低成本、小型化的超再生式脉冲信号接收技术方案;(2)设计实现了一款适合与超再生式电路集成的贴片电小天线,对该天线进行等效电路建模,并利用天线等效电路模型实现了天线与超再生电路的联合时域仿真分析和设计;(3)利用电小天线输入阻抗特性,将电小天线作为开关控制LC振荡电路的组成部件,形成了有源振荡电路与电小天线一体化设计,并在此基础上实现了一种低成本、高效率的电小天线生成和发射脉冲技术方案;(4)结合电小天线等效电路模型的特点,通过建立自由空间传播损耗的等效电路模型,实现了脉冲信号收发系统性能的时域联合仿真。在此基础上设计完成了基于超再生式体系结构的电小天线收发脉冲实验演示,结果表明,本文提出技术方案适合应用于开关键控(On-off Keying,OOK)等调制方式下的脉冲无线通信。
[Abstract]:Pulse radio systems are widely used in short range communication, radar detection, location and ranging. However, The wideband characteristics of short-time pulse signal pose a great challenge to the design of RF front-end and antenna. The traditional RF wireless system adopts frequency-domain design method under given frequency range and input power. The antenna and RF front-end circuits are analyzed and designed as linear time-invariant elements. Theoretically, the system performance is limited by gain bandwidth. This paper aims at the time domain characteristic of pulse signal and the input impedance and radiation characteristic of small antenna. This paper studies and designs a scheme for transmitting and receiving pulse signals of small antennas based on super-regenerative architecture. Different from the traditional design method in frequency domain, the technical scheme presented in this paper is from the point of view of time domain. By modeling the equivalent circuit of electric small antenna, the integrated design of super-regenerative RF front-end circuit and electric small antenna is realized, which provides a new way to realize pulse radio miniaturization, low cost and low complexity. The main contents and achievements of this paper include: (1) using the input impedance characteristic of the electric small antenna, the electric small antenna is designed as a part of the oscillation circuit in the superregenerative circuit, and a kind of low cost is designed. A miniaturized super-regenerative pulse signal receiving technique scheme is designed and implemented. A patch electric small antenna suitable for integration with super-regenerative circuit is designed, and the equivalent circuit model of the antenna is built. Using the antenna equivalent circuit model, the combined time domain simulation analysis and design of antenna and super-regenerative circuit are realized. Using the input impedance characteristic of electric small antenna, the electric small antenna is used as the component of switching control LC oscillation circuit. Based on the integrated design of active oscillation circuit and electric small antenna, a low cost and high efficiency electric small antenna generating and transmitting pulse technical scheme is developed. By establishing the equivalent circuit model of free space propagation loss, the joint simulation of pulse signal transceiver system performance in time domain is realized. Based on this, the experimental demonstration of pulse transceiver for small electric antenna based on super-regenerative architecture is designed and completed. The results show that the proposed scheme is suitable for pulse wireless communication with on-off critical control OOKs and other modulation modes.
【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】：2014
【分类号】：TN820
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本文编号：1632334