What is the Difference Between GSLV and PSLV

GSLV ( Geosynchronous satellite launch vehicle) and PSLV ( Polar satellite launch vehicle) both are satellite- launch vehicles ( rockets) developed by ISRO. PSLV earned its title 'the Workhorse of ISRO' when it consistently delivered the IRS series of satellites. GSLV presented the Indian Space Program with its most demanding test.

What is the Difference Between GSLV and PSLV
what-is-the-difference-between-glsv-and-pslv

What is the Difference Between GSLV and PSLV

GSLV & PSLV, Two launchers One Organization

India's development in space technology has attracted worldwide attention and demand. ISRO, which was developed as India's primary space research and development organization, is now successfully launching many series of satellites and successful missions of exploring other planets. It is responsible for developing launcher and propulsion systems, launch sites, satellites and their tracking networks. 

ISRO, during the 1990s, planned to acquire booster technology from the Russian Space Organization, Glavkosmos. But, since the United States opposed this technology transfer and imposed sections against the ISRO in May 1992, Glavkosmos halted the transfer but agreed to sell some hardware. As a result, India developed its own technology and research capability. 

GSLV ( Geosynchronous Satellite Launch Vehicle) and PSLV (Polar satellite launch vehicle) both are satellite- launch vehicles (rockets) developed by ISRO. India joined a group of six nations on October 15, 1994, and successfully demonstrated the placement of 800- kg remote sensing satellite, IRS-P2 using PSLV. PSLV earned its title 'the Workhorse of ISRO' when it consistently delivered the IRS series of satellites. 

GSLV presented the Indian Space Program with its most demanding test. It was developed when India felt the need for a heavy lift booster, in the early 1980s ( as PSLV was inadequate to place heavy payloads in geosynchronous orbit). GSLV MK II is the most significant launch vehicle developed by India, which is currently in operation. GSLV MK III is designed to carry the 4-ton weight of satellites into Geosynchronous Transfer Orbit (GTO), or about 10 tons to Low Earth Orbit ( LEO), which is about twice the capacity of GSLV Mk II. 

Differences 

PSLV is the third generation launch vehicle of India and the first Indian launch vehicle which is equipped with liquid stages. GSLV, on the other hand, is the fourth generation launch vehicle and is a three-stage vehicle with four liquid strap-ons. 

PSLV is designed mainly to deliver the earth observation or remote sensing satellites, whereas, GSLV has been designed for launching communication satellites. GSLV delivers satellites into a higher elliptical orbit, Geosynchronous Transfer Orbit (GTO) and Geosynchronous Earth Orbit (GEO). 

PSLV can carry satellites up to a total weight of 2000 kgs into space and reach up to an altitude of 600-900 km. GSLV can carry weight up to 5000 kgs and reach up to 36,000 km.

Some technical specifications:

Vehicle specifications:

Height:
GSLV- 49.13 Meters
PSLV-44 Meters

Number of Stages: GSLV- 3 Stage - PSLV- 4 Stage

Lift Off Mass: GSLV- 414.75 tonnes - PSLV-320 tonnes (XL)

First Flight: GSLV-April 18, 2001 - PSLV- September 20, 1993.

Payloads: GSLV can place up to 5,000 kg in Low Earth Orbits and 2,500 kg to GTO.  PSLV can take up to 1,750 kgs of payload to Sun-Synchronous Polar Orbits of 600 km altitude. 

Strap-on Motors: the four liquid engine strap-on used in GSLV are heavier derivatives of PSLV's PS2 and use one Vikas engine each. 

Launches:
PSLV: other than many successful launches PSLV also delivered  Chandrayaan-1 in 2008 and Mars Orbiter Spacecraft in 2013. Most recent is PSLV-C46 Mission, May 22, 2019. 

GSLV: from GSLV-D1/ GSAT- April 18, 2001, to GSLV-F11/ GSAT-7 mission – December 19, 2018, GSLV has a list of successful launches. 

With the launch of the Italian astronomical satellite by PSLV-C8 in April 2007, ISRO entered in the international market of commercial launch.