A Short Note On Launch Spacecraft And Its Effects On The Earth Orbit

2107 Words Apr 26th, 2016 9 Pages
5.1 Launch:
Originally ISRO was to launch spacecraft using on its GSLV, but due to failure of GSLV in previous tests it was not advisable to wait for the new development of rockets as that would have delayed the project for at least three years. So ISRO switched to the PSLV rockets. Since the PSLV was not designed to place the spacecraft with a direct injection on a Mars trajectory, the spacecraft was launched into a highly elliptical Earth orbit and used its own propellers over multiple raising phases. The spacecraft used the gravitational pull force and its own kinetic energy to take advantage of the Oberth effect to place itself on a trans-Mars trajectory.
The C-25 PSLV-XL placed the satellite into Earth orbit with predefined perigee, apogee and inclination. During the first three orbit raising operations, ISRO constantly tested the spacecraft systems. The launch vehicle was tracked from launch till spacecraft separation by number of ground stations, which received the telemetry data and transmitted it in real time to computer systems at Sriharikota center. Two ships carrying Ship Borne Terminals (SBT) were deployed in the South Pacific Ocean which supported the tracking of the vehicle. After separation from launch vehicle, spacecraft’s main engine, a derivative of India 's communications satellites, used the bipropellant combination of dinitrogen tetroxide and monomethyl hydrazine to achieve necessary thrust for escape velocity from Earth. For Mars orbit insertion and…

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