Complex-frequency excitations increase Fisher information and improve natural frequency estimation accuracy in underdamped SDOF systems compared to harmonic excitations under Gaussian noise.
Comparative study of modal analysis techniques for bridge dynamic characteristics.Mechanical Systems and Signal Processing, 17(5):965–988, 2003
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Natural frequency estimation using complex-frequency excitations
Complex-frequency excitations increase Fisher information and improve natural frequency estimation accuracy in underdamped SDOF systems compared to harmonic excitations under Gaussian noise.