IEEE Transactions on Automatic Control

Issue 1 • Jan 1990

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Displaying Results 1 - 23 of 23
  • Time and lag recursive computation of cumulants from a state-space model

    Publication Year: 1990, Page(s):4 - 17
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1100 KB)

    Time and lag recursive algorithms for the computation of the cumulants of the state vector and the output process of a multiple-input multiple-output time-varying state-space model are derived, using a Kronecker product representation for the cumulants of vector processes. The noise processes are not assumed to be stationary. Symmetry relations for the cumulants of vector processes are discussed. ... View full abstract»

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  • Joining the right queue: a state-dependent decision rule

    Publication Year: 1990, Page(s):104 - 108
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (440 KB)

    The problem of assigning customers to one of several parallel queues so as to minimize the average time spent in the system (sojourn time) is studied as a Markov decision process. It is shown how the approach developed by K.R. Krishman and T.J. Ott (Proc. 25th IEEE Conf. Decision Contr. Dec. 1986, p.2124-8) to investigate state-dependent routing of voice traffic for blocking minimization can also ... View full abstract»

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  • Time-domain approaches to quadratic phase coupling estimation

    Publication Year: 1990, Page(s):48 - 56
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (684 KB)

    Bicoherence is a quantity used to estimate the contribution of second-order nonlinearity to the power in bifrequencies. The conventional approach to the problem uses second- and third-order periodograms for bicoherence estimation. Time-domain approaches that use autocorrelation and third-order cumulant samples or their estimates are developed. These techniques are suitable for use in situations wh... View full abstract»

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  • A new problem in control system design [and circuit design]

    Publication Year: 1990, Page(s):114 - 117
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (336 KB)

    An optimisation problem arising in the design of circuits and control systems is formulated, and an outer approximation algorithm for solving it is presented. The problem is characterized by constraints that must be satisfied for all functions in a given subset of a function space. It is shown that an outer-approximation-type algorithm increases the number of variables and constraints at each iter... View full abstract»

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  • Analysis of bilinear systems using Walsh functions

    Publication Year: 1990, Page(s):119 - 123
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (356 KB)

    By using Walsh functions to analyze bilinear systems, it is shown that the nonlinear differential system equation can be converted to a linear algebraic generalized Lyapunov equation that can be solved for the coefficients of the state x(t) in terms of the Walsh basis functions. This Lyapunov equation provides an approximate closed-form solution for a bilinear system. Some guidel... View full abstract»

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  • Modified extended Kalman filtering and a real-time parallel algorithm for system parameter identification

    Publication Year: 1990, Page(s):100 - 104
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (288 KB)

    A modification of the extended Kalman filter (EKF) algorithm, which is called MEKF for short, it introduced. The modification is achieved by an improved linearization procedure. For this purpose, a parallel computational scheme is recommended, and it has immediate applications to identifying unknown system parameters of time-varying, linear, stochastic state-space models in real time. It should be... View full abstract»

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  • Minimax LQ stochastic tracking and servo problems

    Publication Year: 1990, Page(s):95 - 97
    Cited by:  Papers (16)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (236 KB)

    It is proved that the separation between feedback and feedforward of the two-degree-of-freedom linear quadratic (LQ) stochastic controller reported by E. Mosca and G. Zappa (ibid., vol.34, p.240-2, 1989) can be suitably extended, when a linear controller is postulated, to the minimax LQ stochastic tracking and servo problems. Besides the relevance of the results, the authors show that in some prob... View full abstract»

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  • Adaptive deconvolution and identification of nonminimum phase FIR systems based on cumulants

    Publication Year: 1990, Page(s):36 - 47
    Cited by:  Papers (56)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (696 KB)

    A novel adaptive deconvolution and system identification scheme is introduced for a linear, non-minimum-phase finite-impulse-response (FIR) system driven by non-Gaussian white noise. The adaptive scheme is based on approximating the FIR system by noncausal autoregressive (AR) models and using higher order cumulants of the system output. As such, it is a blind equalization (deconvolution) scheme. T... View full abstract»

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  • Stochastic adaptive control and Martingale limit theory

    Publication Year: 1990, Page(s):66 - 71
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (440 KB)

    Recently, S.P. Meyn and P.E. Caines (ibid., vol.AC-32, p.220-6, 1987) have used ergodic theory for Markov processes to give the first asymptotic stability analysis of a nontrivial stochastic adaptive control problem. By nontrivial is meant a stochastic adaptive control problem whose parameter variation has finite nonzero power. They correctly observed that the stochastic Lyapunov function methods ... View full abstract»

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  • A stable iterative adaptive control

    Publication Year: 1990, Page(s):88 - 92
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (384 KB)

    An adaptive control algorithm that carries out the online controller design iteratively is formulated. A set of conditions is provided under which the closed-loop system is stable. In particular, the controller iterations must satisfy certain convergence and continuity assumptions, but only one-step iteration is required for each parameter update, resulting in a considerable reduction in computati... View full abstract»

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  • On the identifiability of non-Gaussian ARMA models using cumulants

    Publication Year: 1990, Page(s):18 - 26
    Cited by:  Papers (73)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (716 KB)

    A fixed set of output cumulants of order greater than two guarantees unique identification of known-order causal ARMA (autoregressive moving-average) models, which are driven by unobservable non-Gaussian i.i.d. noise. The models are allowed to be non-minimum-phase, and their outputs may be corrupted by additive colored Gaussian noise of unknown covariance. The ARMA parameters can be estimated eith... View full abstract»

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  • Large-scale convex optimal control problems: time decomposition, incentive coordination, and parallel algorithm

    Publication Year: 1990, Page(s):108 - 114
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (484 KB)

    A parallel algorithm based on time decomposition and incentive coordination is developed for long-horizon optimal control problems. This is done by first decomposing the original problem into subproblems with shorter time horizon, and then using the incentive coordination scheme to coordinate the interaction of subproblems. For strictly convex problems it is proved that the decomposed problem with... View full abstract»

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  • A method to design multirate controllers for plants sampled at a low rate

    Publication Year: 1990, Page(s):57 - 60
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (388 KB)

    Classical discrete control systems allow control of the output of a plant at sampling instants. If control of the output between sampling instants is required, a multirate controller can be used. An analytical procedure is developed that allows feedforward control of the output at multirate instants and feedback control at sampling instants. The method proposed is a practical approach to the model... View full abstract»

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  • Limitations on the stabilizability of globally-minimum-phase systems

    Publication Year: 1990, Page(s):117 - 119
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (276 KB)

    The author gives examples showing that, in general, it is possible for a globally-minimum-phase system in normal form to have states that cannot be driven asymptotically to the origin by means of any open-loop control. In particular, this provides counterexamples to a number of recently published stabilization theorems. It is established, by means of examples, that a minimum-phase system in normal... View full abstract»

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  • Improved consistent estimation of the order of stochastic control systems

    Publication Year: 1990, Page(s):97 - 100
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (224 KB)

    A more consistent method of estimating the order of feedback control systems is developed. The algorithm is of the recursive type. Strong consistency is derived under less stringent conditions than those of H.F. Chen and L. Guo (ibid., vol.AC-32, p.531-5, 1987) View full abstract»

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  • Model reference robust adaptive control without a priori knowledge of the high frequency gain

    Publication Year: 1990, Page(s):71 - 78
    Cited by:  Papers (71)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (520 KB)

    A novel model-reference robust adaptive controller that does not require a priori knowledge of the high-frequency-gain sign is proposed. The scheme is applicable to minimum-phase plants of arbitrary relative degree and ensures that in the absence of unmodeled dynamics the tracking error converges to zero and all the signals remain bounded. The control law uses a particular projected parameter vect... View full abstract»

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  • On adaptive inverse dynamics control of rigid robots

    Publication Year: 1990, Page(s):92 - 95
    Cited by:  Papers (94)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (360 KB)

    The authors derive an adaptive inverse dynamics control law for rigid robots that overcomes the most restrictive difficulty of such schemes to date, namely, the requirement that the inverse of the estimated inertia matrix remain bounded. The control scheme still requires the joint accelerations for its implementation. In practice, one would implement this scheme by estimating the acceleration from... View full abstract»

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  • Asymptotically optimal estimation of MA and ARMA parameters of non-Gaussian processes from high-order moments

    Publication Year: 1990, Page(s):27 - 35
    Cited by:  Papers (99)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (776 KB)

    A description is given of an asymptotically-minimum-variance algorithm for estimating the MA (moving-average) and ARMA (autoregressive moving-average) parameters of non-Gaussian processes from sample high-order moments. The algorithm uses the statistical properties (covariances and cross covariances) of the sample moments explicitly. A simpler alternative algorithm that requires only linear operat... View full abstract»

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  • Decentralized multirate control

    Publication Year: 1990, Page(s):60 - 65
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    The objective of the study is to introduce a decentralized control approach to multirate linear systems. Each control channel is assigned a single sample rate, which provides simplicity in design of local controllers. This control strategy is natural for plants with widely different characteristic frequencies, and it is suitable for implementation using multiprocessor schemes View full abstract»

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  • Input conditions for continuous-time adaptive systems problems

    Publication Year: 1990, Page(s):78 - 82
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (392 KB)

    The authors develop persistence-of-excitation conditions for the exponential convergence of continuous-time adaptive algorithms. Exponential convergence is important for robustness. Adaptive algorithms without such convergence can behave unacceptably in the presence of modeling inadequacies. Conditions for convergence are usually framed as spanning conditions on a regressor vector involving the ou... View full abstract»

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  • On methods of treating DC levels in an adaptive digital Smith predictor

    Publication Year: 1990, Page(s):65 - 66
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (188 KB)

    Two popular methods of treating unknown or slowly varying DC levels in the input and output measurements used for parameter estimation in an adaptive digital Smith predictor are studied. They are the high-pass filtering method and the method of estimating an additional constant. The performance of the former is found to be inferior in that it leads to a larger output variance under a stochastic en... View full abstract»

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  • An indirect stochastic adaptive scheme with on-line choice of weighting polynomials

    Publication Year: 1990, Page(s):82 - 85
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (304 KB)

    An indirect adaptive control algorithm combining a quadratic cost measure of the Clarke-Gawthrop type and the classical control strategy of pole placement is presented. It updates the weighting polynomials of the cost function online in such a way that the closed-loop poles are located at prespecified positions. The convergence and stability of the adaptive control algorithm is also given without ... View full abstract»

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  • Adaptive LQG regulator via the separation principle

    Publication Year: 1990, Page(s):85 - 88
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (244 KB)

    The continuous-time linear quadratic adaptive control problem with average cost per unit time is studied. It is shown that a consistent estimator of an unknown parameter and the optimal control can be obtained by using the separation principle, which decomposes the problem into two parts: to find the consistent estimator in the case without controls; and to solve the Riccati equation in the LQ reg... View full abstract»

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Aims & Scope

In the IEEE Transactions on Automatic Control, the IEEE Control Systems Society publishes high-quality papers on the theory, design, and applications of control engineering.  Two types of contributions are regularly considered

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Meet Our Editors

Editor-in-Chief
P. J. Antsaklis
Dept. Electrical Engineering
University of Notre Dame