Now showing items 1-20 of 69

    • 77 GHz radar-based altimeter for unmanned aerial vehicles 

      Beitrag zu einer Konferenz
      Hügler, Philipp; Geiger, Martin; Waldschmidt, Christian (Universität Ulm, 2018)
      For multi-copter unmanned aerial vehicles (UAVs) sensing of the actual altitude is an important task. Many functions providing increased flight safety and easy maneuverability rely on altitude data. Commonly used sensors ...
    • A 77-GHz cavity antenna array in PCB technology 

      Beitrag zu einer Konferenz
      Vasanelli, Claudia; Ruess, Tobias; Waldschmidt, Christian (Universität Ulm, 2016-01-11)
      In this paper the design and the implementation of a cavity antenna array in PCB technology for automotive radar applications is presented. The array consists of four cavity antennas fed by a microstrip-line feeding network ...
    • A complex low-RCS antenna system for the placement of mm-wave automotive radars behind car bumpers 

      Beitrag zu einer Konferenz
      Vasanelli, Claudia; Bögelsack, Frank; Waldschmidt, Christian (Universität Ulm, 2018-12-10)
      Automotive radars are one of the key sensor technologies to develop reliable fully-automated cars. They are usually installed behind the bumper of the vehicle and therefore, multiple reflections can occur. The multiple ...
    • A dielectric lens antenna fed by a flexible dielectric waveguide at 160 GHz 

      Beitrag zu einer Konferenz
      Geiger, Martin; Hitzler, Martin; Iberle, Johannes; Waldschmidt, Christian (Universität Ulm, 2017-05-18)
      Flexible antennas in radar applications enable the user to go around obstacles or detect targets at hidden places. In this paper, two elliptical lenses of different size made of high density polyethylene and stacked on ...
    • A flexible dielectric leaky-wave antenna at 160 GHz 

      Beitrag zu einer Konferenz
      Geiger, Martin; Hitzler, Martin; Waldschmidt, Christian (Universität Ulm, 2017)
      Flexible antennas provide the opportunity to place them on bent or moving surfaces. For leaky-wave antennas the mechanical flexibility offers a second possibility to modify the beam direction besides the frequency scanning ...
    • A multicopter-based focusing method for ground penetrating synthetic aperture radars 

      Beitrag zu einer Konferenz
      Schartel, Markus; Prakasan, Krishnendhu; Hügler, Philipp; Burr, Ralf; Mayer, Winfried; Waldschmidt, Christian (Universität Ulm, 2018)
      A subsurface focusing method for multicopter-based mine detection using a ground penetrating synthetic aperture radar (GPSAR) is presented. In the first part of this paper, the challenges of a side-looking single-input ...
    • Accuracy evaluation for antenna measurements at mm-wave frequencies 

      Beitrag zu einer Konferenz
      Böhm, Linus; Bögelsack, Frank; Hitzler, Martin; Wiehler, Stefan; Waldschmidt, Christian (Universität Ulm, 2016)
      Measurements of integrated antennas are often cumbersome and erroneous. Inaccuracies of the measurement setup, unknown material parameters, and metal parts in the immediate surrounding of the antenna under test (AUT) cause ...
    • Active transmitarray submodule for K/Ka band satcom applications 

      Beitrag zu einer Konferenz
      Chaloun, Tobias; Hillebrand, Christoph; Waldschmidt, Christian; Menzel, Wolfgang (Universität Ulm, 2015)
      A novel concept for an active transmitarray architecture for K/Ka Band Satcom applications is presented. The highly-integrated antenna system is based on planar multilayer arrangement covering both Satcom frequency bands ...
    • Adaptive clustering for contour estimation of vehicles for high-resolution radar 

      Beitrag zu einer Konferenz
      Schlichenmaier, Johannes; Roos, Fabian; Kunert, Martin; Waldschmidt, Christian (Universität Ulm, 2016-08-08)
      Future automotive radars will be able to achieve much higher range and angular resolution compared to currently used radar sensors. This enables functionalities like vehicle contour estimation to be used in advanced driver ...
    • An automated millimeter-wave antenna measurement setup using a robotic arm 

      Beitrag zu einer Konferenz
      Böhm, Linus; Bögelsack, Franck; Hitzler, Martin; Waldschmidt, Christian (Universität Ulm, 2015)
      In order to measure antenna properties precisely at frequencies above 100 GHz, elaborate measurement techniques are required. This is especially challenging for integrated antennas, as probes require a steady, rigid ...
    • Analyzing attacks on cooperative adaptive cruise control (CACC) 

      Beitrag zu einer Konferenz
      Van der Heijden, Rens W.; Lukaseder, Thomas; Kargl, Frank (Universität Ulm, Institute of Electrical and Electronics Engineers (IEEE), 2017-11)
      Cooperative Adaptive Cruise Control (CACC) is one of the driving applications of vehicular ad-hoc networks (VANETs) and promises to bring more efficient and faster transportation through cooperative behavior between ...
    • Antenna design for noncoherent massive MIMO systems 

      Beitrag zu einer Konferenz
      Bucher, Stephan; Ragab, Ahmed N.; Yammine, George; Fischer, Robert F.H,; Waldschmidt, Christian (Universität Ulm, 2018-10-15)
      Massive MIMO is one of the key technologies that enables an increase in capacity in multi-user MIMO systems. However, these systems suffer from high channel estimation complexity and its degradation due to pilot contamination. ...
    • Automotive radar interference mitigation by reconstruction and cancellation of interference component 

      Beitrag zu einer Konferenz
      Bechter, Jonathan; Waldschmidt, Christian (Universität Ulm, 2015)
      Automotive radar interference is an issue arising with the increasing amount of radar systems in automotive scenarios. Interference can influence the functionality of a radar system, e.g. decrease its detection capability. ...
    • Automotive radar interference mitigation using a sparse sampling approach 

      Beitrag zu einer Konferenz
      Bechter, Jonathan; Roos, Fabian; Rahman, Mahfuzur; Waldschmidt, Christian (Universität Ulm, 2017)
      The application of radar sensors for driver assistance systems and autonomous driving leads to an increasing probability of radar interferences. Those interferences degrade the detection capabilities and can cause sensor ...
    • Bats-inspired frequency hopping for mitigation of interference between automotive radars 

      Beitrag zu einer Konferenz
      Bechter, Jonathan; Sippel, Carmen; Waldschmidt, Christian (Universität Ulm, 2016)
      It was reported for specific bats, that they use a certain scheme to shift the frequencies of their echo location calls to counteract interferences with conspecifics. As in road traffic, an increasing number of cars is ...
    • Blind adaptive beamforming for automotive radar interference suppression 

      Beitrag zu einer Konferenz
      Bechter, Jonathan; Demirlika, Amarilda; Hügler, Philipp; Roos, Fabian; Waldschmidt, Christian (Universität Ulm, 2018-06-21)
      Radar sensors offer enormous advantages as sensing devices for automated and autonomous driving. However, when multiple of such sensors are operated in a large number of cars, there is a high risk of the occurrence of ...
    • Bounded rational decision-making with adaptive neural network priors 

      Beitrag zu einer Konferenz
      Hihn, Heinke; Gottwald, Sebastian; Braun, Daniel A. (Universität Ulm, 2018-08-30)
      Bounded rationality investigates utility-optimizing decision-makers with limited information-processing power. In particular, information theoretic bounded rationality models formalize resource constraints abstractly in ...
    • Characterization of a mm-Wave automotive radar with a Low-RCS MIMO antenna system 

      Beitrag zu einer Konferenz
      Vasanelli, Claudia; Baur, Klaus; Nezadal, Martin; Gulan, Heiko; Steiner, Maximilian; Waldschmidt, Christian (Universität Ulm, 2018-11-12)
      Millimeter-wave (mm-wave) automotive radars are typically installed behind the car fascia. However, the placement behind the bumper can cause multiple reflections, which may lead to a wrong estimation of the direction of ...
    • Compressed sensing based single snapshot DoA estimation for sparse MIMO radar arrays 

      Beitrag zu einer Konferenz
      Roos, Fabian; Hügler, Philipp; Tovar Torres, Lizette Lorraine; Knill, Christina; Schlichenmaier, Johannes; Vasanelli, Claudia; Appenrodt, Nils; Dickmann, Jürgen; Waldschmidt, Christian (Universität Ulm, 2019-04-25)
      The angular resolution of a radar system can be enhanced with an increasing antenna aperture. Instead of using more antenna elements, the distances in the aperture can be increased with a sparse array. To mitigate the high ...
    • Context-aware cloud topology optimization for OpenStack 

      Beitrag zu einer Konferenz
      Hauser, Christopher B.; Tsitsipas, Athanasios; Domaschka, Jörg (Universität Ulm, 2018-01-31)
      CACTOS offers Cloud developers, operators, and consultants a context-aware optimisation for private Clouds. It leads to better and more reliable user experience, by optimising the mapping of virtual to physical resources, ...