Now showing items 21-40 of 86

    • 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 ...
    • Breitbandige hochintegrierte FMCW-Radare bei 160 GHz für industrielle Anwendungen 

      Dissertation
      Hitzler, Martin (Universität Ulm, 2019-05-27)
      Viele Anwendungen im industriellen Umfeld können durch kostengünstige Radarsensoren, die in Silizium-Germanium hochintegriert sind, erschlossen werden. Ausgehend von den typischen Anforderungen und Randbedingungen wird ein ...
    • 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 ...
    • Clustering of closely adjacent extended objects in radar images using velocity profile analysis 

      Beitrag zu einer Konferenz
      Schlichenmaier, Johannes; Roos, Fabian; Hügler, Philipp; Waldschmidt, Christian (Universität Ulm, 2019-06-03)
      As high resolution automotive radars become more common, so does their usage for next-generation functionalities like advanced driver assistant systems and autonomous driving. This creates the need for robust clustering ...
    • Comparison of 2D and 3D compressed sensing for high-resolution TDM-MIMO radars 

      Beitrag zu einer Konferenz
      Roos, Fabian; Hügler, Philipp; Knill, Christina; Tovar Torres, Lizette Lorraine; Appenrodt, Nils; Dickmann, Jürgen; Waldschmidt, Christian (Universität Ulm, 2019)
      In order to enhance the resolution of radar sensors, the sampling of the different measurement domains range, Doppler, and direction-of-arrival can be improved. This, for example, leads to the application of a sparse array ...
    • Compensation of motion-induced phase errors in TDM MIMO radars 

      Wissenschaftlicher Artikel
      Bechter, Jonathan; Roos, Fabian; Waldschmidt, Christian (Universität Ulm, 2017)
      For high-resolution direction of arrival estimation, a wide aperture is necessary. This can be achieved with multiple-input multiple-output (MIMO) radars, which offer a wide virtual aperture. However, the requirement 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 ...
    • Cooperative target detection in a network of single-channel radar sensors 

      Beitrag zu einer Konferenz
      Steiner, Maximilian; Osman, Karim Sherif; Waldschmidt, Christian (Universität Ulm, 2019-04-25)
      In automotive sensor networks the spatial distribution of the radar sensors allows to unveil additional information about the target objects. For example, the different angles to a target provide an increased robustness, ...
    • Data rate reduction for chirp-sequence based automotive radars using compressed sensing 

      Beitrag zu einer Konferenz
      Roos, Fabian; Hügler, Philipp; Knill, Christina; Appenrodt, Nils; Dickmann, Jürgen; Waldschmidt, Christian (Universität Ulm, 2018)
      For autonomous driving high-resolution radar sensors are key components, which have the drawback of high data rates. In order to reduce the amount of sampled data, random samples can be omitted and afterwards ...
    • Design and experimental characterization of a surface with low radar cross-section at millimeter-wave frequencies 

      Beitrag zu einer Konferenz
      Vasanelli, Claudia; Bögelsack, Frank; Waldschmidt, Christian (Universität Ulm, 2017-01-19)
      The investigation of low radar cross-section (RCS) structures is of great practical interest for the car integration of radar systems. This paper presents for the first time the study of a low-RCS surface at millimeter ...
    • Digital beamforming to mitigate automotive radar interference 

      Beitrag zu einer Konferenz
      Bechter, Jonathan; Eid, Karim; Roos, Fabian; Waldschmidt, Christian (Universität Ulm, 2016)
      Interference between automotive radars decreases the sensors’ detection capabilities. It is possible to use digital beamforming (DBF) in multi-antenna systems to reduce the power received from certain directions of ...
    • Digital true time delay for pulse correlation radars 

      Beitrag zu einer Konferenz
      Schartel, Markus; Mayer, Winfried; Waldschmidt, Christian (Universität Ulm, 2016)
      A novel concept for digital true time delay pulse correlation radars using digital programmable delay lines and monolithically integrated radar front-ends is investigated. The effects of quantization errors on side lobe ...
    • Effort considerations of compressed sensing for automotive radar 

      Beitrag zu einer Konferenz
      Roos, Fabian; Hügler, Philipp; Bechter, Jonathan; Razzaq, Muhammad Ahsan; Knill, Christina; Appenrodt, Nils; Dickmann, Jürgen; Waldschmidt, Christian (Universität Ulm, 2019-01-21)
      The application of iterative compressed sensing algorithms for automotive radar is often considered as too complex for real-time evaluation. In this paper, it is shown that the number of required iterations can be chosen ...
    • Ego-motion estimation using distributed single-channel radar sensors 

      Beitrag zu einer Konferenz
      Steiner, Maximilian; Hammouda, Omar; Waldschmidt, Christian (Universität Ulm, 2018-08-23)
      The motion of a car has a vast impact on the relative measurements of all environmental sensors. Consequently, the precise knowledge of the ego-motion of a sensor equipped car is important for higher level signal processing ...
    • Eigenschaften und Unterdrückung von Interferenzen zwischen Kfz-Radarsensoren 

      Dissertation
      Bechter, Jonathan (Universität Ulm, 2019-05-27)
      Zur Erfassung von Personen und Objekten im Umfeld von Kraftfahrzeugen werden unter anderem Radarsensoren eingesetzt. Um die Sensoranforderungen für automatisierte und autonome Fahraufgaben zu erfüllen, werden an einzelnen ...
    • Enhanced angle estimation accuracy of ultra compact radars inspired by a biomimetic approach 

      Beitrag zu einer Konferenz
      Grüner, Patrik; Chaloun, Tobias; Waldschmidt, Christian (Universität Ulm, 2017)
      The theoretical and experimental evaluation of using biomimetic antenna arrays (BMAAs) in an angle sensing radar system is presented. This ultra compact antenna system can enhance the angle estimation accuracy for radar ...
    • Enhancement of doppler resolution for chirp-sequence modulated radars 

      Beitrag zu einer Konferenz
      Roos, Fabian; Barjenbruch, Michael; Appenrodt, Nils; Dickmann, Jürgen; Waldschmidt, Christian (Universität Ulm, 2017)
      For automotive radar sensors the Doppler resolution is a key parameter, since it is used to separate targets which are in the same radial distance. For future applications the Doppler signature of targets can be ...
    • Enhancement of doppler unambiguity for chirp-sequence modulated TDM-MIMO radars 

      Beitrag zu einer Konferenz
      Roos, Fabian; Bechter, Jonathan; Appenrodt, Nils; Dickmann, Jürgen; Waldschmidt, Christian (Universität Ulm, 2018-05-09)
      Current automotive radar sensors enhance the angular resolution using a multiple-input multiple-output approach. The often applied time-division multiplexing scheme has the drawback of a reduced unambiguous Doppler velocity ...
    • Enhancements in mm-wave antenna measurements: automatic alignment and achievable accuracy 

      Wissenschaftlicher Artikel
      Böhm, Linus; Bögelsack, Frank; Hitzler, Martin; Waldschmidt, Christian (Universität Ulm, 2017-10)
      Due to various error sources, accurate integrated antenna measurements can be difficult to achieve. This study analyses the accuracy of a measurement set-up for radiation pattern (RP), directivity and gain measurements. ...