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A frequency domain approach for time-reversal of microwave impulses.

机译：微波脉冲时间反转的频域方法。

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摘要

In this thesis, a compact and low-cost electronic circuit system is designed for time-reversal of microwave impulses with nanosecond and sub-nanosecond temporal durations. A frequency domain approach is adopted in order to avoid high sampling rate in time. The proposed system obtains the discrete spectra of input impulses first, then realizes time-reversal in frequency domain, and finally synthesizes the time-reversed impulses using discrete continuous wave elements. It is composed of commercially available circuits including oscillators, mixers/multipliers, band-pass-filters, amplifiers, and switches, hence embodies low-cost system-on-chip implementation. The proposed time-reversal circuit's performance is verified by Advanced Design System (ADS) simulations, with most non-idealities of realistic circuit components taken into account. Simulation results show that, microwave impulses with about 1 ns temporal width and 3 -- 10 GHz spectral coverage are reliably reversed in time, even with presence of strong noise.;Furthermore, the proposed time-reversal circuit system is validated in the context of electromagnetic propagation in complex environments. Specifically, circuit-electromagnetic co-simulation is carried out to investigate the "focusing" phenomena of time-reversal. A full-wave Maxwell's equations solver based on Finite Difference Time Domain (FDTD) method is developed to model electromagnetic propagation, and it is coupled to ADS circuit simulator. The FDTD solver is implemented on parallel cluster Message Passing Interface (MPI), in order to relieve high computational complexity due to complex environments. Two real-world problems (one is for wireless communication and the other is for radar detection) are investigated. Desired "focusing" phenomena in both space and time are demonstrated by the simulation results, which conclude that the proposed time-reversal system can be deployed in practical time-reversal communication and radar applications.
机译：本文设计了一种紧凑，低成本的电子电路系统，用于微波脉冲的时间反转，时间间隔为纳秒和亚纳秒以下。为了避免及时的高采样率，采用了频域方法。所提出的系统首先获得输入脉冲的离散频谱，然后在频域中实现时间反转，最后使用离散连续波元素合成时间反转脉冲。它由市售电路组成，包括振荡器，混频器/乘法器，带通滤波器，放大器和开关，因此体现了低成本的片上系统实现方案。建议的时间反转电路的性能已通过高级设计系统（ADS）仿真进行了验证，其中考虑了实际电路组件的大多数非理想情况。仿真结果表明，即使存在强噪声，时间宽度约为1 ns且频谱覆盖范围为3-10 GHz的微波脉冲也能在时间上可靠地反转;此外，在以下情况下验证了所提出的时间反转电路系统的有效性：在复杂环境中的电磁传播。具体而言，进行电路电磁协同仿真以研究时间反转的“聚焦”现象。开发了基于有限时域（FDTD）方法的全波麦克斯韦方程求解器，以对电磁传播进行建模，并将其与ADS电路仿真器耦合。 FDTD求解器在并行集群消息传递接口（MPI）上实现，以减轻由于复杂环境而导致的高计算复杂性。研究了两个实际问题（一个用于无线通信，另一个用于雷达检测）。仿真结果表明了在空间和时间上都存在期望的“聚焦”现象，结论是所提出的时间倒转系统可以部署在实际的时间倒转通信和雷达应用中。

著录项

  • 作者

    Sha, Shaoshu.;

  • 作者单位

    The University of Texas at Arlington.;

  • 授予单位 The University of Texas at Arlington.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.S.
  • 年度 2009
  • 页码 62 p.
  • 总页数 62
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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