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Numerical estimation of Fricke-Morse impedance model parameters using single-frequency sinusoidal excitation
Fu Zhang1,2, Benjamin Sanchez2, Seward B Rutkove2
1Department of Electronic Science and Technology, Hunan University, Changsha, Hunan, People's Republic of China.
Objective:
The Fricke-Morse impedance model is widely used in bioelectrical impedance analysis (BIA), which is usually fitted by multi-frequency electrical impedance data. Here, we propose a novel numerical method for estimating the model parameters using single-frequency sinusoidal excitation.
Approach:
A single-frequency sinusoidal signal is used as the current excitation, from which the initial transient, the steady-state and the ending transient voltage responses along with the current excitation are recorded. The model parameters can be then estimated with numerical calculations from the acquired signals.
Main Results:
Simulation and experimental measurements are verified on a 2R1C circuit by using a 50 kHz sinusoidal current excitation. The results show that the maximum relative errors of the estimated model parameters are <1% in simulation with 2% noise and <2% in experimental measurement.
Significance:
The proposed method could extend the applications of wideband BIA by using single-frequency excitation, rather than multi-frequency excitation as is done today.
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