Through-Wall Imaging With UWB Radar System - KEMT FEI TUKE

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4.4 Measurements of the Practical Scenarios 82 according to the required application. The 2D view is suitable image representation method for most of the objects. For weakly reflecting objects 1D view, or zoomed 2D or 3D view provide a good solution. 3D view with rotation and zooming option could provide the best solution when it would be possible to implement it in radar device with relatively simple controlling. 4.4.3 Imaging of the Object Behind a Concrete Wall The results from scanning of the metal cabinet behind the 60 cm thick concrete wall are shown in this section. The relative permittivity of the wall was approx. εrw = 7.7 and wall conductivity approx. σw = 33.2 mS/m. The metal cabinet has dimension approx. 60 × 40 × 50 cm. The measurement was provided by the International Research Centre for Telecommunications and Radar, Delft University of Technology in the Netherlands with M-sequence UWB radar described in Section 2.1.3. Bistatic radar with horn antennas and clock frequency fc = 4.5GHz was used. The measurement scenario can be seen in Fig. B.0.1 a). The object behind the wall was scanned by 4 m horizontal antennas movement. The SAR imaging with precise TOA estimation described in Section 4.1 was computed after the all preprocessing steps described in Section 2.4 were undertaken. The antenna beam was also compensated according to the equation (4.1.16) during migration. The results from measurements are shown in Appendix B. 2D view of migrated image is shown in Fig. B.0.1 b). Here, the whole measurement scenario including the front wall and the metal cabinet is figured. In order to focus on the scanned object the zoom in Z direction from Z = 0.8 m - 4 m is shown in Fig. B.0.1 c). In this case only the metal cabinet without front wall is visible. It can be seen that the metallic objets could be imaged with UWB radar even behind the 60 cm concrete wall if the appropriate colormap is chosen. 4.4.4 Imaging of the Object Behind a Wooden Door The results from scanning of the metal cabinet behind the wooden door are shown in this section. The measurement was provided by the International Research Centre for Telecommunications and Radar, Delft University of Technology in the Netherlands with M-sequence UWB radar described in Section 2.1.3. Bistatic radar with horn antennas and clock frequency fc = 4.5GHz was used. The measurement scenario can be seen in Fig. C.0.1 a). The object behind the door was scanned by the 1.5 m vertical antennas movement. The SAR imaging without the wall compensation was computed after the all preprocessing steps described in Section 2.4 were undertaken. The antenna beam was also compensated according to the equation (4.1.16) during migration. The results from measurements are shown in Appendix C.
4.4 Measurements of the Practical Scenarios 83 2D view of migrated image is shown in Fig. C.0.1 b). Here, the empty room without metal cabinet behind the door is figured. In order to compare the signals strength between reflections from door and from metal cabinet behind the door the complete scenario with object behind the door with the same colormap is shown in Fig. C.0.1 c). It can be seen that most of the energy penetrate through the wall and reflect back from the metal cabinet. There are many situations where an entrance door are barricaded by a metallic furniture. UWB radar device could helps us to investigate if the door are barricaded before entering a hazardous environment.
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TECHNICAL UNIVERSITY OF KOˇSICE Fa
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Acknowledgement I give a sincere gr
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CONTENTS v 3 Goals of Dissertation
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LIST OF FIGURES vii List of Figures
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LIST OF FIGURES ix 4.4.3 Aquarium f
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LIST OF FIGURES xi List of Symbols
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LIST OF FIGURES xiii kx - Horizonta
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Chapter 1 Introduction 1.1 Motivati
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1.3 Thesis Organization 3 In additi
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Chapter 2 State Of The Art 2.1 UWB
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2.2 Through-Wall Radar Basic Model
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2.3 SAR Scanning 9 and shall remain
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2.4 Calibration and Preprocessing 1
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2.4 Calibration and Preprocessing 1
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2.5 Radar Imaging Methods Overview
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Page 45 and 46: 2.5 Radar Imaging Methods Overview
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Page 113 and 114: BIBLIOGRAPHY 99 [13] T. W. Barrett,
Page 115 and 116: BIBLIOGRAPHY 101 [46] G. Derveaux,
Page 117 and 118: BIBLIOGRAPHY 103 [81] S. Kidera, T.
Page 119 and 120: BIBLIOGRAPHY 105 [115] J. Sachs, M.
Page 121: BIBLIOGRAPHY 107 [150] O. Yilmaz, S
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Through-Wall Imaging With UWB Radar System - KEMT FEI TUKE

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