# Difference between revisions of "NCS: Moving Horizon Estimation"

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<!-- Include links to materials that you used in your lecture. At a minimum, this should include a link to your lecture presentation. You might also include links to MATLAB scripts or other source code that students would find useful --> | <!-- Include links to materials that you used in your lecture. At a minimum, this should include a link to your lecture presentation. You might also include links to MATLAB scripts or other source code that students would find useful --> | ||

<!-- Sample lecture link: * [[Media:L1-1_Intro.pdf|Lecture: Networked Control Systems: Course Overview]] --> | <!-- Sample lecture link: * [[Media:L1-1_Intro.pdf|Lecture: Networked Control Systems: Course Overview]] --> | ||

− | + | * [[Media:L4-2_MHE.pdf|Lecture: Moving Horizon Estimation]] | |

+ | * [[Media:Stateestim.pdf|Lecture notes: State estimation]] | ||

== Reading == | == Reading == | ||

<!-- A reading list for the lecture. This will typically be 3-5 articles or book chapters that are particularly relevant to the material being presented. The reading list should be annotated to explain how the articles fit into the topic for the lecture. --> | <!-- A reading list for the lecture. This will typically be 3-5 articles or book chapters that are particularly relevant to the material being presented. The reading list should be annotated to explain how the articles fit into the topic for the lecture. --> | ||

− | * <p>[http://pubs.acs.org/cgi-bin/abstract.cgi/iecred/2005/44/i08/abs/ie034308l.html Critical evaluation of extended Kalman filtering and moving horizon estimation], E.L. Haseltine and J.B. Rawlings, ''Ind. Eng. Chem. Res.'', vol. 44, no.8, 2005. Contains several examples where EKF and MHE have been applied. Discusses the differences. | + | * <p>[http://pubs.acs.org/cgi-bin/abstract.cgi/iecred/2005/44/i08/abs/ie034308l.html Critical evaluation of extended Kalman filtering and moving horizon estimation], E.L. Haseltine and J.B. Rawlings, ''Ind. Eng. Chem. Res.'', vol. 44, no.8, 2005. Contains several examples where EKF and MHE have been applied. Discusses the differences between the methods and when EKF is likely to fail.</p> |

+ | |||

+ | * <p>[http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=26479&arnumber=1178905&count=27&index=5 Constrained State Estimation for Nonlinear Discrete-Time Systems: Stability and Moving Horizon Approximations], C.V. Rao, J.B. Rawlings, and D.Q. Mayne, ''IEEE Transactions on Automatic Control'', vol.48, no.2, 2003. A mathematical treatment of MHE and stability conditions are derived. Everybody should read at least Section I.</p> | ||

− | * <p>[http://www.cs.unc.edu/~welch/media/pdf/kalman_intro.pdf An Introduction to the Kalman Filter], G. Welch and G. Bishop. Gives | + | * <p>[http://www.cs.unc.edu/~welch/media/pdf/kalman_intro.pdf An Introduction to the Kalman Filter], G. Welch and G. Bishop. Gives an introduction to the extended Kalman filter in discrete time.</p> |

== Additional Resources == | == Additional Resources == | ||

<!-- Links to additional information. If there are good sources of additional information for students interested in exploring this topic further, these should go at the bottom of the page. --> | <!-- Links to additional information. If there are good sources of additional information for students interested in exploring this topic further, these should go at the bottom of the page. --> | ||

+ | * <p>[http://jbrwww.che.wisc.edu/theses/rao.ps Moving Horizon Strategies for the Constrained Monitoring and Control of Nonlinear Discrete-Time Systems] C.V. Rao. Rao's PhD thesis contains a lot of material on MHE. There is also a discussion on MAP estimates.</p> | ||

+ | * <p>[http://www.eng.newcastle.edu.au/eecs/cdsc/books/cce/ Constrained Control and Estimation - An Optimisation Approach], G. C. Goodwin, M. M. Seron, J. A. De Dona. Springer Verlag, 2005. This is a recent book treating constrained control and estimation in a unified framework (including finite horizon optimal control and RHC) using discrete-time formulation. The website has a lot of additional useful and interesting material.</p> |

## Latest revision as of 04:52, 1 May 2006

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In this lecture, we give an introduction to moving horizon estimation (MHE) and extended Kalman filters (EKF). These filter stuctures can be used with nonlinear models and are therefore more general than the standard Kalman filter. Furthermore, MHE can also take constraints on the noise and the state space, as well as asymmetric probability distributions, into account. MHE is dual to receding horizon control (RHC) and also relies on optimization software. The lecture ends with a brief discussion on stability properties of MHE.

## Lecture Materials

## Reading

Critical evaluation of extended Kalman filtering and moving horizon estimation, E.L. Haseltine and J.B. Rawlings,

*Ind. Eng. Chem. Res.*, vol. 44, no.8, 2005. Contains several examples where EKF and MHE have been applied. Discusses the differences between the methods and when EKF is likely to fail.

Constrained State Estimation for Nonlinear Discrete-Time Systems: Stability and Moving Horizon Approximations, C.V. Rao, J.B. Rawlings, and D.Q. Mayne,

*IEEE Transactions on Automatic Control*, vol.48, no.2, 2003. A mathematical treatment of MHE and stability conditions are derived. Everybody should read at least Section I.

An Introduction to the Kalman Filter, G. Welch and G. Bishop. Gives an introduction to the extended Kalman filter in discrete time.

## Additional Resources

Moving Horizon Strategies for the Constrained Monitoring and Control of Nonlinear Discrete-Time Systems C.V. Rao. Rao's PhD thesis contains a lot of material on MHE. There is also a discussion on MAP estimates.

Constrained Control and Estimation - An Optimisation Approach, G. C. Goodwin, M. M. Seron, J. A. De Dona. Springer Verlag, 2005. This is a recent book treating constrained control and estimation in a unified framework (including finite horizon optimal control and RHC) using discrete-time formulation. The website has a lot of additional useful and interesting material.