Augmented Satellite Launch Vehicle

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Augmented Satellite Launch Vehicle
ASLV.svg
Augmented Satellite Launch Vehicle
Function Small carrier rocket
Manufacturer ISRO
Country of origin  India
Size
Height 24 metres (79 ft)
Diameter 1 metre (3.3 ft)
Mass 41,000 kilograms (90,000 lb)
Capacity
Payload to
400km LEO
150 kilograms (330 lb)
Associated rockets
Family SLV, PSLV, GSLV
Launch history
Status Retired
Launch sites Sriharikota
Total launches 4
Successes 1
Failures 2
Partial failures 1
First flight 24 March 1987
Last flight 4 May 1994
Notable payloads SROSS
First Stage
Engines 2 solid
Thrust 502.6 kilonewtons (113,000 lbf) each
Specific impulse 253 sec
Burn time 49 seconds
Fuel Solid
Second Stage
Engines 1 solid
Thrust 702.6 kilonewtons (158,000 lbf)
Specific impulse 259 sec
Burn time 45 seconds
Fuel Solid
Third Stage
Engines 1 solid
Thrust 304 kilonewtons (68,000 lbf)
Specific impulse 276 sec
Burn time 36 seconds
Fuel Solid
Fourth Stage
Engines 1 solid
Thrust 90.7 kilonewtons (20,400 lbf)
Specific impulse 277 sec
Burn time 45 seconds
Fuel Solid
Fifth Stage
Engines 1 solid
Thrust 35 kilonewtons (7,900 lbf)
Specific impulse 281 sec
Burn time 33 seconds
Fuel Solid

The Augmented Satellite Launch Vehicle (संवर्धित उपग्रह प्रक्षेपण यान) or Advanced Satellite Launch Vehicle, also known as ASLV, was a five-stage solid propellant rocket developed by the Indian Space Research Organisation (ISRO) to place 150 kg satellites into LEO.[1] This project was started by India during the early 1980s to develop technologies needed for a payload to be placed into a geostationary orbit.[2][3] Its design was based on Satellite Launch Vehicle.[4] ISRO did not have sufficient funds for both the PSLV programme and the ASLV programme at the same time and the ASLV programme was terminated after the initial developmental flights.[2] The payloads of ASLV were Stretched Rohini Satellites.[4]

Vehicle[edit]

The ASLV was not a simple variant of the earlier SLV but a more complex vehicle; a five-stage vehicle with the core stage not igniting until the two strap-on first stage boosters burn out. The payload capacity of the ASLV is approximately 150 kg to an orbit of 400 km with a 47-degree inclination.[4]

At liftoff, the ASLV generated 92,780 kgf of thrust. It was a 41,000 kilogram rocket, measuring 23.5 metres in length with a core diameter of one metre.[4]

History[edit]

The ASLV made four launches, of which one was successful, two failed to achieve orbit, and a fourth achieved a lower than planned orbit which decayed quickly. The type made its maiden flight on 24 March 1987, and its final flight on 4 May 1994.

Three successive failures plunged the project into a crisis. ISRO scientist had to confront new technological challenges and one of the important design changes was the addition of the 2 strap on boosters attached to either side of the first stage. Strap on separation, bulbous heat shield, "closed loop" guidance system as opposed to the "open loop" guidance system of the SLV-3 and heat shield management and separation had to be adapted by the scientists.

Launch History[edit]

All four ASLV launches occurred from the SLV Launch Pad at the Sriharikota High Altitude Range. The launch pad was converted to an ASLV launch complex after the closure of SLV launch programme.[citation needed]

Flight Launch date/time (UTC) Launch pad Payload Payload mass Result Notes
D1 24 March 1987[5]
06:39
SLV Launch Pad SROSS A 150 kg Failure First stage did not ignite after strap-on burnout.[4]
D2 13 July 1988[5]
09:13
SLV Launch Pad SROSS-B 150 kg Failure Insufficient control gain[4]
D3 20 May 1992[5]
00:30
SLV Launch Pad SROSS-C 106 kg Partial failure[6] Lower than expected orbit and incorrect spin-stabilisation, payload decayed quickly.
D4 4 May 1994[5]
00:00
SLV Launch Pad SROSS-C2 113 kg Success[6]

See also[edit]

References[edit]

  1. ^ http://www.isro.org/aslv.htm
  2. ^ a b http://www.bharat-rakshak.com/SPACE/space-launchers-aslv.html
  3. ^ Menon, Amarnath (15 April 1987). "Setback in the sky". India Today. Retrieved 18 January 2014. 
  4. ^ a b c d e f http://www.astronautix.com/lvs/aslv.htm
  5. ^ a b c d McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 19 December 2011. 
  6. ^ a b http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/sross3.html