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Step response method for transmission line parameter estimation

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In this paper a method is proposed to determine parameters for circuits of known structure through the use of step responses. The method is developed in the frequency as well as time domains based on nonlinear minimum least squares extraction to determine the unknown parameters. Pspice circuit simulations and MATLAB simulations are performed on circuits constructed from passive elements of transmission lines, these being resistors, inductors and capacitors, to validate the method. Additionally, comparison in terms of accuracy is made with the direct method which uses time specific output data points.


transmission lines, nonlinear least mean square, system identification, circuit parameter estimation, step response methods