Modeling Method of Coaxial Cable Transmission Characteristics Based on Fourier Decomposition

At present, in the fields of mobile communication, aerospace and et al., the signal transmission quality problems caused by the structural damage of the coaxial cable have become increasingly prominent, and the fault diagnosis methods for the coaxial cable have also received extensive attention in the industrial field. However, most of the commonly used method, such as the numerical modeling-based methods only consider the effect of signal reflection and transmission delays, but the effect of signal attenuation is not discussed, which in turn undermine the effect of cable diagnosis method. In this regard, this paper proposes a method for analyzing the attenuation characteristics of coaxial cables based on Fourier decomposition. First, the attenuation characteristics of the coaxial cable on fixed frequency is measured by the vector network analysis. Then, the transmission attenuation for continuous frequency is modeled using the Support Vector Regression. Next, the arbitrary input signal is decomposed by Fourier Transform and the attenuation of the coaxial cable when any signal is input is finally established. This paper also carried out the pulse attenuation measurement experiment based on the hardware platform, and compared the measured results with the simulation results, which verified the effectiveness of the proposed method.