Wavelet-packet identification of dynamic systems in frequency subbands

Authors:
Henrique Mohallem Paiva;Roberto Kawakami Harrop Galvão
Affiliations:
Sistemas de Comando de Vôo, Empresa Brasileira de Aeronáutica, EMBRAER - São José dos Campos, Brazil;Divisão de Engenharia Eletrônica, Instituto Tecnológico de Aeronãutica, CTA- São José dos Campos, Brazil
Venue:
Signal Processing - Special section: Advances in signal processing-assisted cross-layer designs
Year:
2006

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Abstract

This work presents a technique for linear system identification in frequency subbands by using wavelet packets. The wavelet-packet decomposition tree is used to establish frequency bands where subband models are created. An algorithm is proposed to adjust the tree structure, in order to achieve a compromise between accuracy and parsimony of the model. In a simulated example involving the identification of an aircraft model, the results of the proposed technique are favourably compared with those of a standard time-domain method.