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  • 501.
    Öhr, Jonas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    Anti-windup and Control of Systems with Multiple Input Saturations: Tools, Solutions and Case Studies2003Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Control of linear systems with saturating actuators are considered and anti-windup compensators for multiple-input multiple-output systems, and robust, almost time-optimal controllers for double integrators with input amplitude saturations, are proposed.

    Windup effects are defined and anti-windup compensators aiming at minimizing the windup effects are proposed. The design is based on 1) linear quadratic (LQ) optimization techniques and 2) heuristic design using Nyquist-like techniques and pole-placement techniques.

    A root-locus like technique that can, approximately, foretell possible directional problems that may be present in MIMO systems with input saturations, and that can be used for design of anti-windup compensators and for selection of appropriate static directional compensators, is proposed.

    The problem of control of double integrators via saturating inputs is addressed and a robust piece-wise linear controller that gives almost time-optimal performance is suggested. It is shown that time optimal control of a double integrator via an input amplitude limiter, is equivalent to time-optimal control of a single integrator having a rate limiter at the input. One such application, concerning control of hydraulic cylinders in container crane systems, is presented. An extension of the controller, allowing synchronous control of two integrators with input rate limitations, is proposed.

  • 502.
    Öjefors, Erik
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    Cheng, Shi
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    From, K.
    Skarin, I.
    Hallbjörner, Paul
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    Rydberg, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    Electrically-steerable single-layer microstrip traveling wave antenna with varactor diode based phase shifters2007Ingår i: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 55, nr 9, s. 2451-2460Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The design of electrically steerable traveling wave microstrip antenna arrays is presented. Varactor diode based phase shifters implemented on the same metallic layer as the patch elements are used to provide a variable progressive phase shift in the array. Two antennas for the 5.8 GHz ISM band, manufactured as single layer printed designs on a standard PTFE soft substrate, are demonstrated. A ten-element beam-tilting vertical array using transmission type phase shifters is realized, yielding between 11.8 to 13.9 dBi gain for the 0deg to 11deg beam tilt tuning range. Using wide phase tuning range reflection type phase shifters a five-element horizontally scanning array with -32deg to 32deg steering range and 10.9-11.3 dBi gain has been realized.

  • 503.
    Öjefors, Erik
    et al.
    Universität Siegen, Institut für Höchstfrequenztechnik und Quantenelektronik, Siegen, Germany.
    Rydberg, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    Monolitic Integrated Antennas in Silicon Technology. Kapitel i bok2008Ingår i: Wave Antennas, Packaging and Beyond: (kapitel i bok) / [ed] Duixian Liu, John Wiley & Sons, USA , 2008Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 504.
    Östman, Andreas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    Detection and Tracking of Human Targets using Ultra-Wideband Radar2016Självständigt arbete på avancerad nivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The purpose of this thesis was to assess the plausibility of using two Ultra- Wideband radars for detecting and tracking human targets. The detection has been performed by two different types of methods, constant false-alarm rate methods and a type of CLEAN algorithm. For tracking the targets, multiple hypothesis tracking has been studied. Particle filtering has been used for the state prediction, considering a significant amount of uncertainty in a motion model used in this thesis project. The detection and tracking methods have been implemented in MATLAB. Tracking in the cases of a single target and multiple targets has been investigated in simulation and experiment. The simulation results in these cases were compared with accurate ground truth data obtained using a VICON optical tracking system. The detection methods showed poor performance when using data that had been collected by the two radars and post-processed to enhance target features. For single targets, the detections were accurate enough to continuously track a target moving randomly in a controlled area. In the multiple target cases the tracker was not able to distinguish the multiple moving subjects.

  • 505.
    Özcelikkale, Ayca
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    Koseoglu, Mehmet
    Dept. of Electrical and Computer Engineering, University of California, Los Angeles, USA.
    Srivastava, Mani
    Dept. of Electrical and Computer Engineering, University of California, Los Angeles, USA.
    Optimization vs. reinforcement learning for wirelessly powered sensor networks2018Ingår i: 2018 IEEE 19TH INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS (SPAWC)286-290, 2018, s. 286-290Konferensbidrag (Refereegranskat)
  • 506.
    Özcelikkale, Ayca
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    McKelvey, Tomas
    Chalmers Univ Technol, Dept Elect Engn, Gothenburg, Sweden.
    Viberg, Mats
    Chalmers Univ Technol, Dept Architecture & Civil Engn, Gothenburg, Sweden.
    Remote Estimation of Correlated Sources Under Energy Harvesting Constraints2018Ingår i: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 17, nr 8, s. 5300-5313Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Remote estimation with an energy harvesting sensor with a limited data and energy buffer is considered. The sensor node observes an unknown temporally correlated field and communicates its observations to a remote fusion center using the energy it harvested. The fusion center employs linear minimum mean-square error estimation to reconstruct the unknown field. We provide performance guarantees for the estimation error under a block transmission scheme, where at each transmission block, data and energy buffers are completely emptied. Our bounds provide insights into how statistical properties of the energy harvesting process and buffer sizes may affect the estimation error. In particular, these bounds suggest insensitivity of the performance to buffer sizes for signals with low degree of freedom and suggest performance improvements with increasing buffer sizes for signals with relatively higher degree of freedom. Depending only on the mean, variance, and finite support of the energy arrival process, these results provide insights for the energy and data buffer sizes for deployment in future energy harvesting wireless sensing systems.

  • 507.
    Özcelikkale, Ayca
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    McKelvey, Tomas
    Chalmers Tekniska Högskola, Göteborg.
    Viberg, Mats
    Chalmers Tekniska Högskola, Göteborg.
    Transmission strategies for remote estimation with an energy harvesting sensor2017Ingår i: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, nr 7, s. 4390-4403Artikel i tidskrift (Refereegranskat)
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