Now showing items 1-20 of 94

    • 160-GHz radar proximity sensor with distributed and flexible antennas for collaborative robots 

      Wissenschaftlicher Artikel
      Geiger, Martin; Waldschmidt, Christian (Universität Ulm, 2019-01-09)
      There is a growing demand for collaborative robots in order to improve the efficiency of industrial processes and to push Industry 4.0 forward. The challenge for these robots is the compliance of the safety regulations to ...
    • 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 160-GHz radar with flexible antenna used as a sniffer probe 

      Wissenschaftlicher Artikel
      Geiger, Martin; Hitzler, Martin; Saulig, Stefan; Iberle, Johannes; Hügler, Philipp; Waldschmidt, Christian (Universität Ulm, 2017-06)
      In radar measurements the observed area is limited by the antenna beamwidth and due to the usually fixed transceiver position, only unhidden targets in a small observation area can be detected. Furthermore, bulky lens ...
    • 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 generalized model for two-element biomimetic antenna arrays 

      Wissenschaftlicher Artikel
      Grüner, Patrik; Chaloun, Tobias; Waldschmidt, Christian (Universität Ulm, 2018-12-19)
      Biomimetic Antenna Arrays (BMAAs) are antenna systems enabling an improved angle estimation for small apertures by mimicking the hearing system of the fly Ormia ochracea. This is achieved by a special kind of coupling ...
    • 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 ...
    • A noncoherent massive MIMO system employing beamspace techniques 

      Wissenschaftlicher Artikel
      Bucher, Stephan; Yammine, George; Fischer, Robert F. H.; Waldschmidt, Christian (Universität Ulm, 2019-09-23)
      Noncoherent detection schemes are an appealing and low-complexity alternative in multi-user massive MIMO uplink systems compared to classical coherent detection algorithms, since no actual channel knowledge is required ...
    • A wideband dielectric waveguide-based 160-GHz radar target generator 

      Wissenschaftlicher Artikel
      Geiger, Martin; Wegner, Christian; Mayer, Winfried; Waldschmidt, Christian (Universität Ulm, 2019-06-22)
      The increasing number of radar sensors in commercial and industrial products leads to a growing demand for system functionality tests. Conventional test procedures require expensive anechoic chambers to provide a defined ...
    • 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 ...
    • Analytical and experimental investigation on mitigation of interference in a DBF MIMO radar 

      Wissenschaftlicher Artikel
      Bechter, Jonathan; Rameez, Muhammad; Waldschmidt, Christian (Universität Ulm, 2017)
      As driver assistance systems and autonomous driving are on the rise, radar sensors become a common device for automobiles. The high sensor density leads to the occurrence of interference, which decreases the detection ...
    • 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. ...
    • Assessment of a millimeter-wave antenna system for MIMO radar applications 

      Wissenschaftlicher Artikel
      Vasanelli, Claudia; Batra, Rahul; Di Serio, Adolfo; Bögelsack, Frank; Waldschmidt, Christian (Universität Ulm, 2016-11-22)
      Multiple-input-multiple-output (MIMO) radars show improved angular resolution compared to traditional phased-array radar systems. Exploiting the advantages of MIMO radars could thus significantly improve the performances ...
    • 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 ...