A Novel Approach to Radiated Emissions Modeling of Low Voltage Differential Signal on SpaceWire Cable Employing Differential Evolution

Authors in their previous work prove that any shielded cable can be treated as a travelling wave antenna while all contributing phenomena have been decomposed in order to evaluate its impact on the cable's electromagnetic radiated emissions. The proposed methodology has been validated employing monochromatic excitation over various ground planes and heights in a coaxial cable. In the present paper, authors expand this previously established methodology in more complex structures and for more complex signals; exploring the case of SpaceWire cable over an aluminium ground fed with Low Voltage Differential Signal (LVDS). This specific setup is studied due to its crucial role in current Space missions and applications, as it is the standard for harness and grounding design. SpaceWire is a space-application focused cable with four shielded twisted pairs employing LVDS signaling, a geometry requiring rather cumbersome calculations in order to analytically extract the radiated emissions. Authors claim that this issue can be bypassed based on the aforementioned methodology identifying the current distribution on the shield responsible for the radiation with the aid of the Differential Evolution algorithm. Results showcase that the extracted model can accurately describe the phenomenon.