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Author: Aulenbacher, U. ×

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Now showing 1 - 8 of 8
  • Publication
    Detection of mini-UAVs in the presence of strong topographic relief - A multisensor perspective
    ( 2016)
    Böniger, U.
    ;
    Ott, B.
    ;
    Wellig, P.
    ;
    Aulenbacher, U.
    ;
    Klare, J.
    ;
    Nussbaumer, T.
    ;
    Leblebici, Y.
    Based on the steadily growing use of mini-UAVs for numerous civilian and military applications, mini-UAVs have been recognized as an increasing potential threat. Therefore, counter-UAV solutions addressing the peculiarities of this class of UAVs have recently received a significant amount of attention. Reliable detection, localization, identification and tracking represents a fundamental prerequisite for such counter-UAV systems. In this paper, we focus on the assessment of different sensor technologies and their ability to detect mini-UAVs in a representative rural Swiss environment. We conducted a field trial in August 2015, using different, primarily short range, experimental sensor systems from armasuisse and selected research partners. After an introduction into the challenges for UAV detection in regions with strong topographic relief, we will introduce the experimental setup and describe the key results from this joint experiment.
  • Publication
    Numerical modelling of ultrasonic scattering
    ( 1988)
    Aulenbacher, U.
    ;
    Bollig, G.
    ;
    Fellinger, P.
    ;
    Morbitzer, H.
    ;
    Weinfurter, G.
    ;
    Zanger, P.
    ;
    Langenberg, K.-J.
    ;
    Schmitz, V.
    Performance prediction of ultrasonic nondestructive testing experiments often requires the availability of system models, which combine mathematical modelling of the transducer with the propagation and scattering of elastic waves in complex environments; see Chapman (1986). For arbitrary applications a priori numerical methods, which appropriately discretize the underlying partial differential equations together with their boundary conditions, seem to be the only approach to model a specific experiment in full detail (Harumi, 1986; Bond et al in these proceedings; Ludwig, 1986). On the other hand, the physical understanding of the occurring wave phenomena can be considerably enhanced, investigating canonical ultrasonic testing situations of minor complexity, which can be tackled mostly by analytical or combined analytical - numerical techniques. Furthermore, these procedures may serve as a convenient tool to evaluate input data for inverse scattering algorithms in order to check their performance, for instance, if they were able to process mode converted field components even though developed for strictly scalar waves. Very often, an analytical technique to treat ultrasonic radiation or scattering may be explicitly exploited to approach the more important inverse problem; examples comprise the elastodynamic geometric theory diffraction and the time-of-flight crack sizing technique (Ogilvy and Temple, 1983), or, as outlined in the following the equivalent source integral representation as basis for various quantitative identification and imaging algorithms.
  • Publication
  • Publication
    Evaluation of transient radiation patterns of ultrasonic phased arrays
    ( 1982)
    Aulenbacher, U.
    ;
    Biet, B.
    ;
    Gebhardt, W.
    ;
    Langenberg, K.-J.
  • Publication
    Comparison of measured and computed transient electromagnetic aperture fields
    ( 1982)
    Aulenbacher, U.
    ;
    Fischer, M.
    ;
    Rech, K.D.
    ;
    Langenberg, K.-J.
  • Publication
  • Publication
    Analytical representation of transient aperture near- and far-fields
    ( 1980)
    Aulenbacher, U.
    ;
    Langenberg, K.-J.
  • Publication
    Transient pressure fields of ultrasonic phased arrays
    ( 1980)
    Aulenbacher, U.
    ;
    Langenberg, K.-J.