Berthold Panzner

Otto-von-Guericke-Universität Magdeburg, Magdeburg, Saxony-Anhalt, Germany

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Publications (7)0 Total impact

  • B. Panzner · A. Jostingmeier · A.S. Omar
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    ABSTRACT: The influence of the element spacing of an antenna array that forms a synthetic aperture is investigated in the context of subsurface imaging. Focusing techniques based on synthetic aperture radar are used in subsurface radar for increasing the lateral resolution, i.e. the resolution of the buried objects in a horizontal plane parallel to the air-soil interface. In this work an exact three dimensional focusing technique that regards the refraction of the two-layered geometry is applied on the measured radar raw data for the image reconstruction of the buried scatterers. In order to investigate the effect of the element spacing of the synthetically generated array on the reconstructed image different measurement scenarios in a realistic environment have been performed. The experimental results show a strong dependence of the discrete element spacing of the antenna array on the quality of the reconstructed images.
    No preview · Conference Paper · Jan 2013
  • Berthold Panzner · Andreas Jostingmeier · Abbas Omar
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    ABSTRACT: The influence of the antenna aperture size on the SAR focusing of subsurface targets is investigated in this contribution. Synthetic aperture focusing techniques are used in subsurface radar for enhancement of the lateral, i.e. the spatial resolution of the buried objects. In order to evaluate the effect of the aperture on the reconstructed image different standard gain horn antennas are applied at Ku-Band (12–18GHz). The antennas with varying apertures are used subsequently in a laboratory GPR setup in the same test scenario. An exact focusing technique that regards the refraction of the two-layered geometry is applied on the measured radar raw data. Since the applied aperture antennas do have different antenna gains, they exhibit different beamwidths and different Fresnel zones. The identification of subsurface targets is largely dependent on the beam that illuminates the area onto the ground surface. The experiment in a prepared GPR setup investigates the impact of the size of the real aperture on the synthetic aperture focusing technique.
    No preview · Article · May 2012
  • Berthold Panzner · Andreas Jostingmeier · Abbas Omar
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    ABSTRACT: The concept of a novel multimodal waveguide measurement technique for the broadband determination of dielectric material properties will be presented in this work. The multimode technique is based on simultaneous excitation of 4 TE modes in a waveguide section whose cross section is designed in a way that the waveguide width a is much larger than its height b. The flattened waveguide is filled homogeneously with the material sample to be determined. The multiple coaxial to waveguide coupling structure has been arranged to allow the orthogonal separation of the multiple eigenmodes in the waveguide. For each of the 4 TE eigenmodes a separate TRL calibration procedure in waveguide regime is performed. A multi-port Vector Network Analyzer has been used to measure the S-Parameters at the coaxial ports. A first measurement demonstrate the validity of the multimode waveguide adapter and proves the properties of the manufactured coupling structure with the assumptions made in the analysis.
    No preview · Article · Jan 2012
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    Berthold Panzner · Andreas Jostingmeier · Abbas Omar
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    ABSTRACT: The implementation of time-domain radar modules for imaging of subsurface targets will be addressed in this work. The radar modules have been used originally in process industry for fill level measurements. In this contribution we will show that these industry radar modules for C-Band and K- Band frequencies, can be adapted in order to apply them for sensing buried objects. The measurement of the reflected pulse unveils information about buried objects and the structure of the ground surface. The radar signal is evaluated by subsampling the carrier modulated Gaussian pulses. The envelope of the consecutive samples, that represents a stretched replica of the high frequency radar signal, is digitized and transferred to a post processing computer. Post processing techniques have been applied on the measured data in order to increase the image resolution. Experiments carried out with the radar modules underline their capability for detection and remote sensing of subsurface objects. Index Terms—ground penetrating radar, image processing, sampling methods, time domain reflectometry
    Preview · Article · Jan 2011
  • Berthold Panzner · Andreas Jostingmeier · Abbas Omar
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    ABSTRACT: Am icro-scale airborne sensor platform based on am icrocopter model that is equipped with a time-domain subsampling impulse radar will be presented in this work. A microcopter is an unmanned aerial system that uses all available engines for lift solely and is remote controlled by purely changing the rotational speed of the individual engines. The microcopter is used as an universal carrier platform for remote sensing applications of locations that are otherwise di!cult to reach. The developed microcopter is equipped with a impulse radar module for 6.3 GHz and 26 GHz. The received radar echo is evaluated by subsampling the carrier modulated Gaussian pulses. The low frequency envelope of the consecutive samples, that represents a stretched replica of the high frequency radar signal, is digitized and recorded for post processing. This contribution illustrates the implementation of the time-domain radar module onto the experimental microdrone to develop a miniature airborne radar system.
    No preview · Article · Jan 2011
  • Berthold Panzner · Andreas Jostingmeier · Abbas Omar
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    ABSTRACT: A compact double-ridged horn antenna for ground penetrating radar applications in the frequency range of 1–7 GHz will be presented in this work. Within this contribution the design, simulation and fabrication of such an antenna will be considered. Among the varying design parameters are linear and exponentially tapered walls as well as variations of the curvature of the dielectric waveguide between the two ridges. In addition an absorber structure and a complex shaped metallic back plate have been introduced to further improve the return loss. The primary design goal is a broad bandwidth while maintaining compact dimensions. Two modifications have been introduced in this antenna design in contrast to the standard TEM horn. By protruding the ridges from the aperture plane and filling the space between the ridges with dielectric material it is possible to lower the operating frequency without increasing the size of the original setup. The proposed design has been applied to subsurface radar application in both, field simulations by means of CST Microwave Studio and measurement in a GPR test scenario. The fabricated antenna has been verified by anechoic chamber measurements. The performance of the antenna with respect to the detection of subsurface objects will be verified by various experiments.
    No preview · Conference Paper · Jul 2010
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    Berthold Panzner · Andreas Jostingmeier · Abbas Omar
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    ABSTRACT: The evaluation of radar signatures of buried objects for three experimental ground penetrating radar setups will be addressed in this paper. The contribution will present corresponding results and experiences. The performance of the imaging capabilities of the designed radar system will be assessed by reconstruction of complex shaped test objects, which have been placed within the ground. The influence of system parameters of the ground penetrating radar have been varied systematically in order to analyze their effects on the image quality. Among the modified parameters are the step size in transverse plane, height of the antenna over ground, frequency range, frequency points, antennas and varying instrument settings. A signal processing technique based on synthetic aperture radar has been applied on the measured raw data. The focus radius around a specific target has been analyzed concerning the compromise between image quality and processing time. The experiments demonstrate that the designed ground penetrating radar systems are capable for detection of buried objects with high resolution.
    Preview · Article · Jan 2010 · International Journal of Electronics and Telecommunications

Publication Stats

9 Citations

Institutions

  • 2010-2013
    • Otto-von-Guericke-Universität Magdeburg
      • Institute of Electronics, Signal Processing and Communications (IESK)
      Magdeburg, Saxony-Anhalt, Germany