Accurate Target Extrapolation Method Exploiting Double Scattered Range Points for UWB radar

Ayumi YAMARYO  Shouhei KIDERA  Tetsuo KIRIMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.8   pp.828-832
Publication Date: 2014/08/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.828
Type of Manuscript: BRIEF PAPER
Category: Electromagnetic Theory
UWB radar,  Range points migration,  Ellipse fitting,  Double scattered signal,  

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Ultra-wide band (UWB) radar has a great advantage for range resolution, and is suitable for 3-dimensional (3-D) imaging sensor, such as for rescue robots or surveillance systems, where an accurate 3-dimensional measurement, impervious to optical environments, is indispensable. However, in indoor sensing situations, an available aperture size is severely limited by obstacles such as collapsed furniture or rubles. Thus, an estimated region of target image often becomes too small to identify whether it is a human body or other object. To address this issue, we previously proposed the image expansion method based on the ellipse extrapolation, where the fitting space is converted from real space to data space defined by range points to enhance the extrapolation accuracy. Although this method achieves an accurate image expansion for some cases, by exploiting the feature of the efficient imaging method as range points migration (RPM), there are still many cases, where it cannot maintain sufficient extrapolation accuracy because it only employs the single scattered component for imaging. For more accurate extrapolation, this paper extends the above image expansion method by exploiting double-scattered signals between the target and the wall in an indoor environment. The results from numerical simulation validate that the proposed method significantly expands the extrapolated region for multiple elliptical objects, compared with that obtained using only single scattered signal.