Analysis of Frequency Domain Characteristics of Crosstalk for Train Network Control Communication Cable

Aiming at crosstalk problem of communication cable in train network control, mechanism of crosstalk generation is analyzed based on multi-conductor transmission lines (MTL) theory, and calculation method of distributed parameter of shielding cable in homogeneous dielectric is given. Frequency domain method of generalized two-port network is used. Frequency domain solution of the coupling response in the cable terminal is derived by solving shielded twisted pair (STP) chain-parameter matrix. Finally, influence factors of crosstalk is simulated. The results show that crosstalk is inversely proportional to the distance between lines and is directly proportional to the height from the ground and the coupling length, and the amplitude of variation increases significantly when the frequency is greater than 80MHz. For shielding layer, double-end grounding has the strongest anti interference ability. Single-end grounding has a significant inhibitory effect on low frequency interference, but has limited suppression of high-frequency interference. Double-end floating has a worse anti interference effect.