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Spacecraft when placed in plasma, spacecraft charging occurs which results in ESD discharge. This paper focuses on ESD fields radiated in spacecraft level and the noise coupled to a nearby wire when it is exposed to these radiated fields. A dipole model is considered to predict the transient radiated fields. The ESD current data is experimentally obtained in order to obtain the noise coupled to nearby...
A study has been made to determine the probable EMI and ESD effects of Electric Propulsion System (EPS) on Spacecraft performance to generate and implement mitigation techniques to overcome these effects. Detailed literature survey has been made on the tests carried out by other space agencies on EPS in Anechoic Chamber along with Vacuum chamber and spacecraft charging related aspects of EPS. The...
Conducted and radiated mode EMI/EMC tests are carried out at subsystem level to establish Electromagnetic compatibility in spacecraft. EMI/EMC test requirements of ISRO spacecraft subsystems are derived from MIL-STD 461C and the procedure given in MIL-STD 462. Low frequency conducted susceptibility test (CS01) is automated to perform the test accurately from 30Hz to 50kHz. The power line impedance...
GSAT-17 spacecraft is one of the most complicated and technologically advanced Satellites being built by Indian Space Research Organisation (ISRO). The payload configuration of GSAT-17 spacecraft is 24 channels In Normal C-Band Transponders, 12 channels in Upper Ext. C-Band Transponders, 2 Channels in Lower Extended C transponders, 2 Channels each in MSS and DRT/SAR. For Lower Ext-C band, 0.75m ×...
The objective of this study is to optimize the location of the magnetometer in the presence of the magnetic torquers on the NASA ISRO Synthetic Aperture RADAR (NISAR) Spacecraft which involves identifying the locations of minimum magnetic field areas due to magnetic torquers. The modelling and simulation are carried out with the help of Computer Simulation Technology (CST) software. Magneto static...
This paper deals with the modeling and estimation of differential mode conducted emissions from a DC/DC Converter (buck converter) which operates at 295 kHz. Typical Buck converter is modeled as ac equivalent circuit and simulations are carried out. Fixed resistive load impedance is considered for the simulation and conducted emissions are simulated in frequency range of 10 kHz to 1MHz. Practical...
The satellite as a system consists of various bundles of harness interconnections between subsystems, across the panels. These bundles of harness consist of different types of cables - power lines, data lines, command lines. Power lines from solar array also carry switching currents from the solar array switching circuits. When all these cables are bundled together, it essentially brings out the problem...
The MARS Orbiter Mission (MOM) spacecraft carries on-board sensitive receiver and high gain antenna system to cater to the requirement of inter-planetary and deep space communication. This paper describes, among others, the stringent EMC requirements for MOM spacecraft, summary of EMC analysis carried out, modification on subsystem level EMI/EMC test limit and EMI/ESD mitigation techniques followed...
In a spacecraft, the Electro Explosive Devices (EED) are used for the appendages deployment activities like Antennas Deployment, Solar arrays deployment etc. EED electronics package provides the required excitation to fire the SQUIB. During the launch phase, the spacecraft experiences a high level of Electromagnetic (EM) radiation. The EEDs should not get enabled due to the EM radiation. EMC analysis...
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