@inproceedings{24348, author = {{Scheytt, Christoph and Grau, Günter}}, booktitle = {{Wissenschaftsforum 2013, Intelligente Technische Systeme, Heinz Nixdorf Institut}}, title = {{{Neue Ansätze für miniaturisierte, hochintegrierte Abstands-, Geschwindigkeits- und Drehwinkelsensoren}}}, year = {{2013}}, } @inproceedings{24346, author = {{Scheytt, Christoph}}, booktitle = {{System, IC and Integrated Antenna Design for Miniaturized, Millimeter-wave Radar Sensors}}, title = {{{Introduction to Integrated mm‐Wave Sensors}}}, year = {{2013}}, } @article{24350, abstract = {{This paper describes the design of D-band phased-array circuits in 0.25 μm technology. The first part describes the design of the passive components which are used in the phased-array systems such as balun, Wilkinson divider and branch-line coupler. A millimeter-wave vector-modulator is designed to support both amplitude and phase control for beam-forming applications. In the second part the designed circuits are integrated together to form a two channel 110-130 GHz phased-array chip. Each channel exhibits 360° phase control with 15 dB of amplitude control range and gain of -10 dB. The entire chip draws 45 mA from 3.3 V supply. The millimeter-wave phase shifting and the low-power consumption makes it ideal for highly integrated scalable beam-forming systems for both imaging and communication.}}, author = {{Elkhouly, Mohamed and Glisic, Srdjan and Meliani, Chafik and Ellinger, Frank and Scheytt, Christoph}}, journal = {{Microwave Theory and Techniques, IEEE Transactions on}}, number = {{99}}, pages = {{1--13}}, title = {{{220–250-GHz Phased-Array Circuits in 0.13- \mu\hbox m SiGe BiCMOS Technology}}}, doi = {{10.1109/TMTT.2013.2258032}}, volume = {{PP}}, year = {{2013}}, } @article{24352, abstract = {{This paper analyses substrate-related spurious tones in fractional-N phase- locked loops with integrated VCOs. Spur positions are calculated and experimentally verified as a function of the divider ratios of prescaler and programmable divider. For an integrated wideband PLL in SiGe BiCMOS technology the spur power levels are measured and compared with theoretical expectations. The power in these spurs is minimized by layout techniques shielding the reference input buffer. Spur minimization by using a variable reference frequency is experimentally demonstrated. Based on this observation, a programmable integer-N PLL for driving the fractional-N synthesizer is suggested to reduce the worst-case spur level significantly. Index Terms — Fractional-N, frequency synthesizers, fractional spurs, substrate spurs, phase-locked loops (PLLs), phase noise. }}, author = {{Osmany, Sabbir Ahmed and Herzel, Frank and Scheytt, Christoph}}, journal = {{Analog Integrated Circuits and Signal Processing}}, number = {{3}}, pages = {{545--556}}, title = {{{Analysis and minimization of substrate spurs in fractional-N frequency synthesizers}}}, doi = {{10.1007/s10470-012-0002-x}}, volume = {{74}}, year = {{2013}}, } @inproceedings{24349, abstract = {{This paper presents the packaging technology and the integrated antenna design for a miniaturized 122-GHz radar sensor. The package layout and the assembly process are shortly explained. Measurements of the antenna including the flip chip interconnect are presented that have been achieved by replacing the IC with a dummy chip that only contains a through-line. Afterwards, radiation pattern measurements are shown that were recorded using the radar sensor as transmitter. Finally, details of the fully integrated radar sensor are given, together with results of the first Doppler measurements.}}, author = {{Beer, Stefan and Girma, Mekdes Gebresilassie and Sun, Yaoming and Winkler, Wolfgang and Debski, Wojciech and Paaso, Jaska and Kunkel, Gerhard and Scheytt, Christoph and Hasch, Jürgen and Zwick, Thomas}}, booktitle = {{7th EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION}}, title = {{{Flip-Chip Package with Integrated Antenna on a Polyimide Substrate for a 122-GHz Bistatic Radar IC}}}, year = {{2013}}, } @inproceedings{29491, author = {{Gail, T. and Leyendecker, S. and Ober-Blöbaum, Sina}}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{43--44}}, title = {{{Computing time investigations for variational multirate integration}}}, volume = {{13(1)}}, year = {{2013}}, } @inbook{29419, author = {{Schütze, O. and Witting, K. and Ober-Blöbaum, Sina and Dellnitz, M. and Tantar, Emilia}}, booktitle = {{EVOLVE - A Bridge Between Probability, Set Oriented Numerics, and Evolutionary Computation}}, pages = {{187--219}}, publisher = {{Springer}}, title = {{{Set oriented methods for the numerical treatment of multi-objective optimization problems}}}, year = {{2013}}, } @inbook{29418, author = {{Leyendecker, S. and Ober-Blöbaum, Sina}}, booktitle = {{Jean-Claude Samin and Paul Fisette, editors, Multibody Dynamics}}, pages = {{97--121}}, publisher = {{Springer}}, title = {{{A variational approach to multirate integration for constrained systems}}}, volume = {{28}}, year = {{2013}}, } @inproceedings{29441, author = {{Flaßkamp, K. and Ober-Blöbaum, Sina and Schneider, T. and Böcker, J. }}, booktitle = {{52nd IEEE International Conference on Decision and Control }}, location = {{Florence, Italy}}, pages = {{7467--7472}}, title = {{{Optimal control of a switched reluctance drive by a direct method using a discrete variational principle}}}, year = {{2013}}, } @inproceedings{29443, author = {{Ober-Blöbaum, Sina and Seifried, A. }}, booktitle = {{European Control Conference}}, location = {{Zurich, Switzerland}}, pages = {{204--209}}, title = {{{A multiobjective optimization approach for optimal control problems of mechanical systems with uncertainties}}}, year = {{2013}}, } @inproceedings{29442, author = {{Flaßkamp, K. and Murphey, T. and Ober-Blöbaum, Sina}}, booktitle = {{European Control Conference}}, location = {{Zurich, Switzerland}}, pages = {{3179--3184}}, title = {{{Discretized switching time optimization problems}}}, year = {{2013}}, } @inproceedings{29447, author = {{Specht, A. and Ober-Blöbaum, Sina and Wallscheid, O. and Romaus, C. and Böcker, J. }}, booktitle = {{IEEE International Electric Machines & Drives Conference (IEMDC)}}, pages = {{1411--1417}}, title = {{{Discretetime model of an IPMSM based on variational integrators}}}, year = {{2013}}, } @inproceedings{29446, author = {{Ringkamp, M. and Ober-Blöbaum, Sina and Leyendecker, S.}}, booktitle = {{ECCOMAS Thematic Conference on Multibody Dynamics}}, title = {{{A numerical approach to multiobjective optimal control of multibody dynamics}}}, year = {{2013}}, } @inproceedings{29444, author = {{Demoures, F. and Gay-Balmaz, F. and Leitz, T. and Leyendecker, S. and Ober-Blöbaum, Sina and Ratiu, T.S. }}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{45--46}}, title = {{{Asynchronous variational Lie group integration for geometrically exact beam dynamics}}}, volume = {{13(1)}}, year = {{2013}}, } @inproceedings{29492, author = {{Ringkamp, M. and Leyendecker, S. and Ober-Blöbaum, Sina}}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{27--28}}, title = {{{Multiobjective optimal control of a four-body kinematic chain}}}, volume = {{13(1)}}, year = {{2013}}, } @inproceedings{29445, author = {{Gail, T. and Leyendecker, S. and Ober-Blöbaum, Sina}}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{43--44}}, title = {{{Computing time investigations of variational multirate systems}}}, volume = {{13(1)}}, year = {{2013}}, } @inproceedings{29490, author = {{Flaßkamp, K. and Murphey, T. and Ober-Blöbaum, Sina}}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{401--402}}, title = {{{Optimization for discretized switched systems}}}, volume = {{13(1)}}, year = {{2013}}, } @inproceedings{11832, abstract = {{In this paper we propose an approach to retrieve the absolute geometry of an acoustic sensor network, consisting of spatially distributed microphone arrays, from reverberant speech input. The calibration relies on direction of arrival measurements of the individual arrays. The proposed calibration algorithm is derived from a maximum-likelihood approach employing circular statistics. Since a sensor node consists of a microphone array with known intra-array geometry, we are able to obtain an absolute geometry estimate, including angles and distances. Simulation results demonstrate the effectiveness of the approach.}}, author = {{Jacob, Florian and Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}}, booktitle = {{38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)}}, issn = {{1520-6149}}, keywords = {{Geometry calibration, microphone arrays, position self-calibration}}, pages = {{116--120}}, title = {{{DoA-Based Microphone Array Position Self-Calibration Using Circular Statistic}}}, doi = {{10.1109/ICASSP.2013.6637620}}, year = {{2013}}, } @inproceedings{11891, abstract = {{In this paper we present a combined hardware/software approach for synchronizing the sampling clocks of an acoustic sensor network. A first clock frequency offset estimate is obtained by a time stamp exchange protocol with a low data rate and computational requirements. The estimate is then postprocessed by a Kalman filter which exploits the specific properties of the statistics of the frequency offset estimation error. In long term experiments the deviation between the sampling oscillators of two sensor nodes never exceeded half a sample with a wired and with a wireless link between the nodes. The achieved precision enables the estimation of time difference of arrival values across different hardware devices without sharing a common sampling hardware.}}, author = {{Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}}, booktitle = {{21th European Signal Processing Conference (EUSIPCO 2013)}}, keywords = {{synchronization, acoustic sensor network}}, title = {{{Sampling Rate Synchronisation in Acoustic Sensor Networks with a Pre-Trained Clock Skew Error Model}}}, year = {{2013}}, } @inbook{46385, abstract = {{In many applications one is faced with the problem that multiple objectives have to be optimized at the same time. Since typically the solution set of such multi-objective optimization problems forms a manifold which cannot be computed analytically, one is in many cases interested in a suitable finite size approximation of this set. One widely used approach is to find a representative set that maximizes the dominated hypervolume that is defined by the images in objective space of these solutions and a given reference point. In this paper, we propose a new point-wise iterative search procedure, Hypervolume Directed Search (HVDS), that aims to increase the hypervolume of a given point in an archive for bi-objective unconstrained optimization problems. We present the HVDS both as a standalone algorithm and as a local searcher within a specialized evolutionary algorithm. Numerical results confirm the strength of the novel approach.}}, author = {{Sosa, Hernández V and Schütze, O and Rudolph, G and Trautmann, Heike}}, booktitle = {{EVOLVE — A Bridge between Probability, Set Oriented Numerics, and Evolutionary Computation IV}}, editor = {{Emmerich, M and Deutz, A and Schuetze, O and Bäck, T and Tantar, A and Moral, PD and Legrand, P and Bouvry, P and Coello, CA}}, isbn = {{978-3-319-01127-1}}, pages = {{189–205}}, publisher = {{Springer International Publishing}}, title = {{{The Directed Search Method for Pareto Front Approximations with Maximum Dominated Hypervolume}}}, doi = {{10.1007/978-3-319-01128-8_13}}, volume = {{227}}, year = {{2013}}, }