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This paper elaborates implementation of new and advanced concepts such as Modular Power System and bus bar scheme for power distribution in ISRO's high power communication satellite. The advantages of using Modular Power System vs. conventional power packages, details of new design and realization of Modular Power System are discussed. New mechanical housings realized for high power communication...
This paper describes the EMI / ESD control methodology applied through the development of a satellite, in order to guarantee electromagnetic compatibility (EMC). The main principles adopted to immunize the satellite against electrostatic discharge (ESD), consequent upon the charging environment encountered in geostationary orbit are discussed. The design guidelines followed to control ESD, the grounding...
The EMI/EMC/ESD test limits followed by different space agencies such as ISRO, EURO and ALCATEL are compared in this paper. The EMI margins available between the emission and susceptibility limits are estimated. The ESD tests carried out at equipment level, the ESD test levels and their applicability are also discussed. This paper details the comparison of EMI/EMC/ESD test limits for a typical spacecraft...
This paper presents the space weather effects on spacecraft. Spacecraft are more susceptible to space weather hazards for a number of reasons. The types of missions are increasingly demanding and payloads are becoming more sophisticated. In addition commercial pressures can result in selection of more light weight spacecraft and less radiation hardened components. Non-availability of the radiation...
NASCAP/GEO code has been employed for on-orbit charging analysis of GSAT-6 satellite. Surface charging of the spacecraft under sunlit and eclipse conditions have been investigated. The GSAT-6 satellite is modeled by specifying the geometry and the exposed surface materials. The plasma environment is represented in terms of a mathematical function called the Maxwellian distribution function. The worst-case...
EMI/EMC Tests on spacecraft subsystems/equipments involve making the test setup, calibration of measuring instruments, verification of test setup and performing the actual tests. A wide range of test frequencies are involved: 100 Hz to 400 MHz for conducted mode tests and 10 kHz to 40 GHz for radiated mode tests. Performing EMI tests in manual mode, sometime, may become tedious, time consuming and...
The CARTOSAT-1 or IRS-P5 is the next generation satellite after IRS-1 series in Indian Remote Sensing Satellite programme. The satellite is the "state of the art technology" with two Panchromatic cameras. These cameras provide stereoscopic images due to their angle of inclination towards earth. One camera called FORE, is mounted at +26 degrees with respect to spacecraft earth viewing axis...
The threat of spacecraft electrostatic discharge (ESD) arises primarily from the energetic charged particles (electrons and ions) present in the magnetospheric plasma of the earth, at the altitudes of geo-synchronous satellites. The charged particles in the energy range, less than 50 keV, give rise to surface charging and those in the higher energy range (>100 keV) penetrate into the interiors...
Assembly, Integration and Testing (AIT) is the process in which the subsystems are integrated and tested in a particular sequence to realize the full spacecraft. It involves detailed interface and performance checks to be carried out on different subsystems. The realization of Electro Magnetic Compatibility (EMC) is one of the major tasks while evolving the full spacecraft. This paper briefly describes...
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