Natural resonance frequency extraction using an early-time and late-time responses combined technique

A pole extraction method using an early-time and late-time responses combined technique is presented. Without the determination of the beginning of the target transient response, the proposed method assumes an ARMA representation to approximate the complete target transient response, and a total least square method is applied to poles extraction. The proposed method is validated using a measured scattering data of a thin wire and a finite cylinder. The processing results show that the proposed method is superior to the KT method and matrix pencil method in an appropriate SNR.