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The ESD test method according to ECSS-E-ST-20-07C [1] has shown weaknesses in reproducibility and reliability. We have previously shown that test results can vary from one test laboratory and setup to another, [2] this entails developing an improved methodology and hardware to address the ECSS test shortcomings. In this paper, a new topology and a generator built using a pressurized high voltage relay,...
In this work, a behavioral model of tubular wave couplers (TWC), whose use was recently included into automotive Standards for immunity verification of wiring harnesses in the frequency range from 400 MHz to 3 GHz, was derived. The model is based on scattering parameter measurements with the TWC mounted onto the calibration structure provided by the manufacturer, and the spurious effects related to...
To control the radiated emission of high-speed link and associated unit, the current approach is to implement overall harness shielding on cables bundles. This method is very efficient in the HF/ VHF (high frequency/ very high frequency) and UHF (ultra-high frequency) ranges when the overall harness shielding is properly bonded on EMC back-shell. Unfortunately, with the increasing frequency, the associated...
A multiconductor transmission line model (MTL) is used to investigate the operation of the IEC 61000-4-6 electromagnetic (EM) clamp in a conducted-immunity test setup for aerospace applications. Aspects of interest include the performance of such a coupling device at very high frequencies (up to 1 GHz), and for extreme values of the common-mode impedance of equipment (short circuits, open circuits)...
In this work, basic principles of an alternative test procedure exploiting crosstalk to reproduce in the terminal loads of a wiring structure the same disturbances that would be induced by traditional radiated susceptibility (RS) tests are presented. Equivalence with radiation is achieved by the use of a generator circuit properly fed with two synchronized RF generators, and holds for whatever loads...
This work presents a theoretical rationale for the substitution of radiated-susceptibility (RS) verifications defined in current aerospace standards with an equivalent conducted-susceptibility (CS) test procedure based on bulk current injection (BCI) up to 500 MHz. Statistics is used to overcome the lack of knowledge about uncontrolled or uncertain setup parameters, with particular reference to the...
Satellite equipment needs to be immune to electrostatic discharges (ESD) likely to occur in flight. Testing the susceptibility against ESD on spacecraft equipment is therefore an important part of the EMC test program. The test method according to ECSS-E-ST-20-07C [1], which is commonly used in space industry, leaves undesirable degrees of freedom on how the test is performed, which in turn has an...
The implementation of an intra-spacecraft wireless communication is only feasible if some system constraints are taking into account very early in the design phase.
Satellite equipment needs to be immune to electrostatic discharges (ESD) likely to occur in flight. Testing the susceptibility against ESD on spacecraft equipment is therefore an important part of the EMC test program. The test method according ISO 14302 [1], which is commonly used in space industry, leaves a lot of freedom to the test conductor on how the test is performed, which in turn has an influence...
The IEEE.802.15.4a standard has recently attracted much attention as an indoor short-range high-speed wireless communication. One of the most exciting characteristics of the IEEE.802.15.4a standard is that its bandwidth is over 500MHz which can satisfy an extensive range of space applications. Moreover due to its low power spectral density emission and its resistance to multipath, the UWB technology...
In this paper, a multi-conductor transmission line (MTL) model of a spacecraft harness is presented. Some of the practical issues that occur in the modeling process are discussed, and typical values of the model parameters for a particular example are given. Finally, the model results are validated with measurements.
The electrical harness is an essential part of all the spacecraft. The prime contractors of spacecraft are especially active in efforts to optimize harness size and mass. The shielding of the harness for Electromagnetic Interference (EMI) control is an important element in this optimization, because cable shields and especially connector backshells have a significant mass impact. We present results...
The purpose of this paper is to present a high fidelity simulation tool named “EMCASL” able to predict the disturbances conducted on the power bus of a spacecraft, and more generally, of any complex system. This advanced simulation tool handles the ‘conducted noise’ electromagnetic compatibility among the various units and subsystems of the satellite and enables engineers to evaluate the effects of...
Based on the SYSTEMA v4 framework, Astrium has developed a new GTD application for solving antenna's decoupling and evaluating the electromagnetism power on specific targets or apertures. This tool uses a corrected forward ray-tracing technique which is particularly efficient for solving antennas — structure interactions in the high frequency domain. Besides, the INCA module, also developed by Astrium...
We present a review of available techniques for analysing the crosstalk problem in cable harnesses. An overview of the use of the low frequency model and the multiconductor transmission line (MTL) theory for predicting the crosstalk level in two-cable geometries is presented from the theoretical and practical points of view. A comparison of the results of both techniques against available experimental...
In addition to the advantages of the reverberation chamber (statistically isotropic incident field), this method allows to perform radiated susceptibility tests which are impossible to realize in a typical anechoic chamber. This paper deals with a novel radiated susceptibility test method applied in thermal vacuum chamber to assess the GAIA focal plane assembly immunity in X-band. The TVAC (thermal...
The methodology [1] able to compute the parasitic electromagnetic (EM) radiations of a solar panel is highly improved in this paper to model real solar panels. Thus, honeycomb composite panels, triple junction solar cells and serie or shunt regulation system can now be taken into account. After a brief summary of the methodology, the improvements are detailed. Finally, some encouraging frequency and...
The present study is related to the ESA/ASTRIUM contract n°4500082825 entitled “Wireless Intra-Spacecraft communications”, whose objectives cover the design, development and validation of a RF wireless communications system for use in spacecraft Assembly Integration and Verification (AIV). This paper presents the main outcomes of this study, whose main objective was to assess, by modelling techniques,...
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