Abstract
In order to investigate the theory of the time domain reflectometry (TDR) cable length measurement, the transmission line transient analysis iteration formula based on the finite difference time domain (FDTD) is derived based on the transmission line theory. The electromagnetic wave propagation theory and the regular pattern of the TDR signal propagating in cables are studied. The theoretical calculations are consistent with the experimental results, which verify the correctness of the transmission line transient analysis iteration formula studied in this paper. To further illustrate the theory of the time domain reflectometry cable length measurement, the iteration formula is applied to the TDR cable length measurement. The impacts of the shape, width and amplitude of the excitation signal on the cable length measurement are analyzed.
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