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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Frequency dispersion compensation in time reversal techniques for UWB electromagnetic waves
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Frequency dispersion compensation in time reversal techniques for UWB electromagnetic waves

机译:UWB电磁波时间反转技术中的频散补偿

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摘要

The invariance of the wave equation under time reversal enables optimal refocusing of ultrawideband waves by time-reversal (TR) arrays. This forms the basis of recently developed TR techniques for selective (re-)focusing and inverse scattering applications. However, in electromagnetic sensing applications involving lossy or dispersive media, such as earth media, time invariance is lost and TR techniques can be significantly degraded. To alleviate this problem, a method to compensate dispersion in TR applications is proposed here. The method is based on short-time Fourier transforms and is shown to improve refocusing.
机译:在时间反转下,波动方程的不变性可以通过时间反转(TR)阵列实现超宽带波的最佳重新聚焦。这构成了最近开发的用于选择性(重新)聚焦和逆散射应用的TR技术的基础。但是,在涉及有损或分散介质(例如地球介质)的电磁感应应用中,时间不变性会丢失,TR技术会大大降低。为了减轻这个问题,这里提出一种补偿TR应用中的色散的方法。该方法基于短时傅立叶变换,并且可以改善重聚焦。

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