The PSLV (Polar Satellite Launch Vehicle) and GSLV (Geosynchronous Satellite Launch Vehicle) are two rocket launch systems developed by the Indian Space Research Organization, or ISRO, to launch satellites into orbit. The main reason behind the advent of the GSLV is the capability to lift greater loads into space. While the PSLV can only lift slightly over a ton of payload to GTO (Geostationary Transfer Orbit), the GSLV is capable of lifting more than double that with a rated capacity of 2 to 2.5 tons. One of the main reasons why the GSLV has such an increased load is its utilization of a cryogenic rocket engine for its last stage.
The PSLV has 4 stages that alternate between solid and liquid fuels while the GSLV has three stages with the only the first stage having solid fuel. Apart from lifting much heavier spacecraft than the PSLV, GSLV will have indigenously built cryogenic engine. It will prove India's capability to build highend technology like this one. India will be able to launch more satellites in single go. This potential can be exploited for commercial flights. Moreover, for future mission like MOM, ISRO needs GSLV to launch bigger and more advance spacecrafts. For this purpose, GSLV will certainly be more significant than PSLV.
