Influence of ultrashort pulse duration on localization of crosstalk peak values in PCB of spacecraft autonomous navigation system

Importance of research on specific aspects of ultrashort pulse propagation and voltage peak values localization along printed circuit board (PCB) multiconductor bus is highlighted. Simulation of a trapezoidal ultrashort pulse propagating along the conductors of the spacecraft autonomous navigation system bus with a different number of excited conductors and a variation of the whole ultrashort pulse duration (3; 0.3; 0.03 ns) has been carried out. In the case of 2 excited conductors, the crosstalk maximum value is 29% of steady state level of 0.5 V and the greatest (by modulus) minimum value is 33.4% of 0.5 V. In the case of 4 excited conductors, the maximum values are located in the nodes but the greatest minimum value is 39.8% of 0.5 V. It is shown that significant signal excess is observed with decreasing of ultrashort pulse duration both for maximum and minimum, but they appear in one transmission line section of the PCB bus.