The Geosynchronous Satellite Launch Vehicle (GSLV) with improvements added to its cryogenic upper stage (CUS) is expected to be ready in the second half of this year.
What is GSLV?
- GSLV is an expendable space launch vehicle designed, developed, and operated by the ISRO to launch satellites and other space objects into Geosynchronous Transfer Orbits.
- GSLV is 49.13 m tall and tallest among all other vehicles of ISRO.
- It is a three-stage vehicle with a lift-off mass of 420 tonnes.
- ISRO first launched GSLV on April 18, 2001 and has made 13 launches since then.
Stages in GSLV
- The first stage comprises S139 solid booster with 138-tonne propellant and four liquid strap-on motors, with 40-tonne propellant.
- The second stage is a liquid engine carrying 40-tonne of liquid propellant.
- The third stage is the indigenously built Cryogenic Upper Stage (CUS) carrying 15-tonne of cryogenic propellants.
Variants in GSLV
- GSLV rockets using the Russian Cryogenic Stage (CS) are designated as the GSLV Mk I while versions using the indigenous Cryogenic Upper Stage (CUS) are designated the GSLV Mk II.
- All GSLV launches have been conducted from the Satish Dhawan Space Centre in Sriharikota.
Difference between PSLV and GSLV
- GSLV has the capability to put a heavier payload in the orbit than the Polar Satellite Launch Vehicle (PSLV).
- PSLV can carry satellites up to a total weight of 2000 kg into space and reach up to an altitude of 600-900 km.
- GSLV can carry weight up to 5,000 kg and reach up to 36,000 km.
- PSLV is designed mainly to deliver 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).
Back2Basics: ISRO’s transportation modules
(1) SLV
- In the space transportation domain, the commissioning of the Satellite Launch Vehicle-3 (SLV-3) project in the early 1970s was the first indigenous experimental satellite launch vehicle.
- As a four stage, all solid, launch vehicle, SLV-3 had its successful launch in July 1980, thrusting India into the select league of six countries with the capability to launch satellites on their own.
- The ASLV- Augmented Satellite Launch Vehicle project, in the early 1980s, was the next step of evolution in launch vehicle technology.
(2) PSLV
- In mid 80s came the Polar Satellite Launch Vehicle (PSLV) project. PSLV was successfully launched in 1994.
- The vehicle has proven to be a workhorse of ISRO, logging over 50 successful missions, launching national as well as foreign satellites.
- On 15 February 2017, PSLV created a world record by successfully placing 104 satellites.
- The nation embarked upon a highly challenging quest to master the complex cryogenic technology.
(3) GSLV
Discussed above.
(4) SSLV
- The Small Satellites Launching Vehicles (SSLVs) used for commercial launching of small satellites is under incubation.
- It is a small-lift launch vehicle being developed by the ISRO with payload capacity to deliver:
- 600 kg to Low Earth Orbit (500 km) or
- 300 kg to Sun-synchronous Orbit (500 km)
- It would help launching small satellites, with the capability to support multiple orbital drop-offs.
- In future a dedicated launch pad in Sriharikota called Small Satellite Launch Complex (SSLC) will be set up.
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