Accuracy Improvement in Least-Squares Estimation with Harmonic Regressor: New Preconditioning and Correction Methods
Paper i proceeding, 2015

Numerical aspects of least squares estimation have not been sufficiently studied in the literature. In particular, information matrix has a large condition number for systems with harmonic regressor in the initial steps of RLS (Recursive Least Squares) estimation. A large condition number indicates invertibility problems and necessitates the development of new algorithms with improved accuracy of estimation. Symmetric and positive definite information matrix is presented in a block diagonal form in this paper using transformation, which involves the Schur complement. Block diagonal sub-matrices have significantly smaller condition numbers and therefore can be easily inverted, forming a preconditioner for a large scale system. High order algorithms with controllable accuracy are used for solving least squares estimation problem. The second part of the paper is devoted to the performance improvement in classical RLS algorithm, which represents a feedforward estimation procedure with error accumulation. Two correction feedback terms originated from combined high order algorithms are introduced for performance improvement in classical RLS algorithms. Simulation results show significant performance improvement of modified algorithm compared to classical RLS algorithm in the presence of roundoff errors.

Persistence of Excitation & Positive Definite Matrices

Recursive Least-Squares Estimation with High Accuracy

Författare

Alexander Stotsky

Chalmers, Energi och miljö, Elkraftteknik

Proceedings of the IEEE Conference on Decision and Control

07431546 (ISSN) 25762370 (eISSN)

Vol. 54rd IEEE Conference on Decision and Control,CDC 2015 4035-4040 7402847
978-1-4799-7886-1 (ISBN)

Ämneskategorier

Beräkningsmatematik

Styrkeområden

Energi

DOI

10.1109/CDC.2015.7402847

ISBN

978-1-4799-7886-1

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2024-07-11