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Calibri 83ffff̙̙3f3fff3f3f33333f33333.$TU Delft Repositoryg l3uuidrepository linktitleauthorcontributorpublication yearabstract
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departmentresearch group programmeprojectcoordinates)uuid:9b81f3831c364c9da91bd28e32ff2625Dhttp://resolver.tudelft.nl/uuid:9b81f3831c364c9da91bd28e32ff26252Tensor networks for MIMO LPV system identificationGunes, B. (TU Delft DataDriven Control); van Wingerden, J.W. (TU Delft DataDriven Control); Verhaegen, M.H.G. (TU Delft Numerics for Control & Identification)In this paper, we present a novel multiple input multiple output (MIMO) linear parameter varying (LPV) statespace refinement system identification algorithm that uses tensor networks. Its novelty mainly lies in representing the LPV subMarkov parameters, data and staterevealing matrix condensely and in exact manner using specific tensor networks. These representations circumvent the curseofdimensionality as they inherit the properties of tensor trains. The proposed algorithm is curseofdimensionality free in memory and computation and has conditioning guarantees. Its performance is illustrated using simulation cases and additionally compared with existing methods.nclosedloop identification; Identification; LPV systems; subspace methods; tensor trains; timevarying systemsenjournal articleDataDriven Control)uuid:d43366ce04384b7a82eecc0bc69071b8Dhttp://resolver.tudelft.nl/uuid:d43366ce04384b7a82eecc0bc69071b8ySurvey of modern control and observation theory for disturbed, target following aerospace systems. Part one: Basic theoryvan Woerkom, P.T.L.M.The document contains a general theory towards the observation and optimal control of disturbed, target following aerospace systems. Disturbed, target following aerospace systems eire defined as aerospace systems that are designed to track a moving target system, while they are subjected to external, timevarying disturbances. The first five chapters of the document discuss state space modelling, optimal control theory, and the theory of (full order) observers. The remaining two chapters of the document apply these modem concepts to the design of control for disturbed, taxget following systems. Control is of the bimodal type, using observergenerated estimates of the state error and of the external disturbance. The document contains a critical discussion of some relevant literature, together with numerous examples from the area of aerospace vehicle observation and control. The emphasis is on space vehicle applications.\optimal control; control systems; control theory; state estimation; observability; multivariable control systems; state variable etnalysis; aerospace systems; spacecraft control; satellite control; aircraft control; helicopter control; missile control; surface vehicles; attitude control; satellite attitude; control; tracking; timevarying systemsreport+Nationaal Lucht en RuimtevaartlaboratoriumCampus only)uuid:f8e5fe5235714fae825bab5e64646809Dhttp://resolver.tudelft.nl/uuid:f8e5fe5235714fae825bab5e646468091Multiband OFDM for Covert Acoustic CommunicationsLeus, G.; Van Walree, P.A.
A multiband OFDM transmitter and receiver are presented for underwater communications at low SNR. Compared with a singleband OFDMscheme, the multiband approach leads to a considerable reduction in the receiver complexity. The proposed system has been tested at sea with 16 subbands covering a total bandwidth of 3.6 kHz, at user data rates of 4.2 and 78 bit/s, and over ranges up to 52 km. At the lower rate, successful message recovery is achieved on a single hydrophone at SNRs down to ?17 dB in a benign channel. In channels with a severe delayDoppler spread the critical SNR rises by some 4 dB. At 78 bit/s the limits of the OFDM signaling scheme are clearly revealed, but at 4.2 bit/s the performance is limited by failure of signal detection and initial synchronization.Vunderwater communications; covert communications; multiband OFDM; timevarying systemsIEEE<8Electrical Engineering, Mathematics and Computer Science'Microelectronics & Computer Engineering
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