Combined MTL-Fullwave Statistical Approach for Fast Estimation of Radiated Immunity of Spacecraft Cable Assemblies Involving Multipair Bundles

Flavia GRASSI  Giordano SPADACINI  Sergio A. PIGNARI  Filippo MARLIANI  

IEICE TRANSACTIONS on Communications   Vol.E98-B   No.7   pp.1204-1211
Publication Date: 2015/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.1204
Type of Manuscript: Special Section PAPER (Special Section on Electromagnetic Compatibility Technology in Conjunction with Main Topics of EMC'14/Tokyo)
intra-system radiated immunity,  random TWP bundles,  satellites,  stochastic modeling,  

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In this work, a computationally-efficient modeling approach is developed to predict the electromagnetic noise induced in the terminal units of random bundles of twisted-wire pairs mounted onboard spacecraft. The proposed model combines the results of a preliminary fullwave simulation, aimed at evaluating the electromagnetic field inside the space vehicle's metallic body, with a stochastic model of a random bundle, based on multiconductor transmission line (MTL) theory. Model assessment versus measurement data obtained characterizing real wiring harness in a full-scale satellite mock-up demonstrates the large sensitivity (up to 40 decibels) of the induced noise levels to different bundle configurations, and corroborates the effectiveness of the proposed simplified modeling strategy for estimating the modal noise voltages induced in the terminal units.