Frequency Dispersion Compensation Through Variable Window Utilization in Time Reversal Techniques for Electromagnetic Waves

Ammar Abduljabbar, Mehmet E. Yavuz, Fumie Costen, Ryutaro Himeno, Hideo Yokota

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    Abstract

    In microwave imaging applications, propagating
    signals undergo additional attenuation in dispersive and lossy
    media when compared to non-dispersive and lossless media. In
    this paper, we introduce a threshold approach and Short-Time
    Fourier transform (STFT) based inverse filters to compensate for
    such additional attenuation in time reversal (TR) based imaging
    algorithms. The method introduced here is utilized to reduce the
    unwanted noise amplification in the received signals during the
    compensation stage. Additionally, optimum settings for window
    type and length in the STFT method are obtained through a
    scanning operation in the propagation medium. Different window
    types and lengths are studied to achieve best focusing resolution
    in TR applications. While utilizing large number of windows
    with short spatial lengths provides improved TR focusing performance,
    it also increases the overall cost and complexity of the
    imaging system. The threshold method introduced here achieves
    improved TR focusing performance without increasing the cost
    by utilizing a lower number of inverse filters.
    Original languageEnglish
    JournalIEEE Transactions on Antennas and Propagation
    Volume64
    Issue number8
    DOIs
    Publication statusPublished - 10 May 2016

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