INSTITUTO DE SISTEMAS E ROBÓTICA Online Model Identification for Set-valued State Estimators With Discrete-Time Measurements João V. Messias Institute.

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INSTITUTO DE SISTEMAS E ROBÓTICA Online Model Identification for Set-valued State Estimators With Discrete-Time Measurements João V. Messias Institute for Systems and Robotics Instituto Superior Técnico Lisbon, Portugal

INSTITUTO DE SISTEMAS E ROBÓTICA Contents  Introduction / Motivation  Robust State Estimation  Set-Valued Estimators  Implementation: HTS  Results  Conclusions

INSTITUTO DE SISTEMAS E ROBÓTICA Introduction/ Motivation The main assumption is that the system model is known with sufficient accuracy; Lack of robustness to parameter variations (performance loss); The goal of this work is to exemplify the application of a robust filter, based on the Kalman Filter; State estimation and system identification. The Kalman Filter framework is a powerful tool for state estimation in linear systems;

INSTITUTO DE SISTEMAS E ROBÓTICA Robust State Estimation Parameter variations have to be taken explicitly into account.

INSTITUTO DE SISTEMAS E ROBÓTICA Robust State Estimation Robust Estimation Methods: - Guaranteed Cost Estimators; - Set-Valued Estimators; - Adaptive Estimators (eg. MMAE); Approaches differ in the way that parameter uncertainty is described.

INSTITUTO DE SISTEMAS E ROBÓTICA Set-Valued Estimation (Petersen & Savkin, 1995) Main characteristics: -Estimates the set of possible states for a given instant; -Deterministic interpretation of system uncertainty; -Allows for non-linear, time-varying uncertainties; -Allows for continuous / discrete sensors; -Allows for missing data; - Model validation can be performed as a dual problem.

INSTITUTO DE SISTEMAS E ROBÓTICA Set-Valued Estimation Integral Quadratic Constraint:

INSTITUTO DE SISTEMAS E ROBÓTICA Set-Valued Estimation Ricatti jump equations:

INSTITUTO DE SISTEMAS E ROBÓTICA Set-Valued Estimation Solution isn’t smooth due to discrete-time measurements.

INSTITUTO DE SISTEMAS E ROBÓTICA Set-Valued Estimation Set estimation:

INSTITUTO DE SISTEMAS E ROBÓTICA System Identification  This method allows for dynamic re- evaluation of system uncertainty.  However, this only checks if a given model is feasible or not;  No explicit methodology for system identification is given;  MMAE is used to compensate;

INSTITUTO DE SISTEMAS E ROBÓTICA Implementation Physical System MMAE SVE

INSTITUTO DE SISTEMAS E ROBÓTICA Implementation MMAE pmf 99%

INSTITUTO DE SISTEMAS E ROBÓTICA Implementation: HTS

INSTITUTO DE SISTEMAS E ROBÓTICA Results

INSTITUTO DE SISTEMAS E ROBÓTICA Results

INSTITUTO DE SISTEMAS E ROBÓTICA Results M2 = 75kg M2 = 65kg

INSTITUTO DE SISTEMAS E ROBÓTICA Results β α

INSTITUTO DE SISTEMAS E ROBÓTICA Results

INSTITUTO DE SISTEMAS E ROBÓTICA Conclusions  Main advantage of set-valued estimators: deals with a large class of uncertainties;  Not straightforward to implement;  Performance is dependant on the quality of the norm bounds on the parameters;  If some of these bounds are configured simply by user design, the results are overly conservative;  It is possible to perform system identification to reduce these norm bounds on-line;  It may be feasible to implement some form of particle-filter based parameter search.