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Browsing by Subject "Observability"

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    • Article  

      Adaptive LQ control with anti-windup augmentation to optimize UAV performance in autonomous soaring applications 

      Kahveci, N. E.; Ioannou, Petros A.; Mirmirani, M. D. (2008)
      The performance of a glider can be considerably improved by means of soaring and optimization of its trajectory. Recent advances in the area of static soaring assume known linear glider dynamics and no actuator saturation ...

    • Conference Object  

      Advanced static soaring flight controls for input constrained aircraft 

      Kahveci, N. E.; Ioannou, Petros A. (2010)
      Control surface actuator nonlinearities are recognized as a source of significant problems in flight control system design and verification. Recently developed adaptive control design methodologies with anti-windup ...

    • Conference Object  

      Aircraft dynamics with input rate constraints: An adaptive flight control application 

      Kahveci, N. E.; Ioannou, Petros A. (2009)
      Magnitude and rate limitations imposed on the input signal in control systems can be handled using antiwindup compensator design procedures with near-optimal system performance guarantees in case the system experiences ...

    • Article  

      Bank filters for ML parameter estimation via the Expectation-Maximization algorithm: The continuous-time case 

      Charalambous, Charalambos D.; Logothetis, Andrew; Elliott, Robert J. (1998)
      In this paper we consider continuous-time partially observed systems in which the parameters are unknown. We employ conditional moment generating functions of integrals and stochastic integrals to derive new maximum-likelihood ...

    • Article  

      Certain nonlinear partially observable stochastic optimal control problems with explicit control laws equivalent to LEQG/LQG problems 

      Charalambous, Charalambos D.; Elliott, R. J. (1997)
      This paper is concerned with partially observed stochastic optimal control problems when nonlinearities enter the dynamics of the unobservable state and the observations as gradients of potential functions. Explicit ...

    • Article  

      Classes of nonlinear partially observable stochastic optimal control problems with explicit optimal control laws 

      Charalambous, Charalambos D.; Elliott, R. J. (1998)
      This paper introduces certain nonlinear partially observable stochastic optimal control problems which are equivalent to completely observable control problems with finite-dimensional state space. In some cases the optimal ...

    • Article  

      Control of continuous-time linear Gaussian systems over additive Gaussian wireless fading channels: A separation principle 

      Charalambous, Charalambos D.; Farhadi, A.; Denic, S. Z. (2008)
      This note is concerned with the control of continuous-time linear Gaussian systems over additive white noise wireless fading channels subject to capacity constraints. Necessary and sufficient conditions are derived, for ...

    • Conference Object  

      Control over wireless communication channel for continuous-time systems 

      Charalambous, Charalambos D.; Denic, S. Z.; Farhadi, A. (2005)
      This paper is concerned with the control of one dimensional continuous time linear Gaussian systems over additive white noise wireless fading channels subject to capacity constraints. Necessary and sufficient conditions ...

    • Article  

      Digraph analysis of large-scale systems: The system primitive 

      Evans, F. J.; Schizas, Christos N. (1979)
      Mapping differential equations into digraphs is shown to give additional insight into system properties, such as controllability and observability. The concept of the system primitive is introduced. © 1979, The Institution ...

    • Article  

      Distributed function calculation via linear iterative strategies in the presence of malicious agents 

      Sundaram, S.; Hadjicostis, Christoforos N. (2011)
      Given a network of interconnected nodes, each with its own value (such as a measurement, position, vote, or other data), we develop a distributed strategy that enables some or all of the nodes to calculate any arbitrary ...

    • Conference Object  

      Exact filters for Newton-Raphson parameter estimation algorithms for continuous-time partially observed stochastic systems 

      Charalambous, Charalambos D.; Logothetis, Andrew; Hibey, Joseph L. (IEEE, 1999)
      This paper presents explicit finite-dimensional filters for implementing Newton-Raphson (NR) parameter estimation algorithms. The models which exhibit nonlinear parameter dependence are stochastic, continuous-time and ...

    • Conference Object  

      Information dissemination in networks via linear iterative strategies over finite fields 

      Sundaram, S.; Hadjicostis, Christoforos N. (2009)
      Given an arbitrary network of interconnected nodes, each with an initial value from a discrete set, we consider the problem of distributively disseminating these initial values under the constraint that the nodes can only ...

    • Conference Object  

      Maximum Likelihood parameter estimation from incomplete data via the sensitivity equations: The continuous-time case 

      Charalambous, Charalambos D. (IEEE, 1999)
      The problem of estimating the parameters for continuous-time partially observed systems is discussed. New exact filters for obtaining Maximum Likelihood (ML) parameter estimates via the Expectation Maximization algorithm ...

    • Article  

      Necessary conditions of optimization for partially observed controlled diffusions 

      Charalambous, Charalambos D.; Hibey, J. L. (1999)
      Necessary conditions are derived for stochastic partially observed control problems when the control enters the drift coefficient and correlation between signal and observation noise is allowed. The problem is formulated ...

    • Conference Object  

      On delayed observers for linear systems with unknown inputs 

      Sundaram, S.; Hadjicostis, Christoforos N. (2005)
      We present a method for constructing reduced-order state observers for linear systems with unknown inputs. Our design provides a characterization of observers with delay, which eases the established necessary conditions ...

    • Conference Object  

      On the time complexity of information dissemination via linear iterative strategies 

      Sundaram, S.; Hadjicostis, Christoforos N. (2010)
      Given an arbitrary network of interconnected nodes, each with an initial value, we study the number of time-steps required for some (or all) of the nodes to gather all of the initial values via a linear iterative strategy. ...

    • Conference Object  

      Optimal sensor selection for structural observability in Discrete Event Systems modeled by Petri nets 

      Ru, Y.; Hadjicostis, Christoforos N. (2007)
      This paper studies sensor selection problems in Discrete Event Systems modeled by Petri nets with outputs (i.e., Petri nets with both transition sensors and place sensors). The goal is to place sensors so as to maintain ...

    • Article  

      Partial state observers for linear systems with unknown inputs 

      Sundaram, S.; Hadjicostis, Christoforos N. (2008)
      We consider the problem of constructing partial state observers for discrete-time linear systems with unknown inputs. Specifically, for any given system, we develop a design procedure that characterizes the set of all ...

    • Article  

      Partially observable nonlinear risk-sensitive control problems: Dynamic programming and verification theorems 

      Charalambous, Charalambos D. (1997)
      In this paper, we consider continuous-time partially observable optimal control problems with exponential-of-integral cost criteria. We derive a rigorous verification theorem when the state and control enter nonlinear in ...

    • Conference Object  

      Position error signal estimation at high sampling rates using data and servo sector measurements 

      Ioannou, Petros A.; Kosmatopoulos, E. B.; Despain, A. M. (2002)
      Track density in hard disk drives (HDD) is related to the performance characteristics of the HDD servo control system. Higher track density can be achieved by improving the performance characteristics of the servo controller ...

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