IRS-1A

IRS-1A, the first of the series of indigenous state-of-art remote sensing satellites, was successfully launched into a polar sun-synchronous orbit on 17 March 1988 from the Soviet Cosmodrome at Baikonur. IRS-1A carries three cameras, LISS-1, LISS-2A and LISS-2B with resolutions of 72.5 metres (238 ft) and 36.25 metres (118.9 ft) respectively with a swath width of about 140 kilometres (87 mi) during each pass over the country. Undertaken by the Indian Space Research Organisation (ISRO). It was a part-operational, part-experimental mission to develop Indian expertise in satellite imagery.

IRS-1A
Mission typeEarth observation
Remote sensing
OperatorISRO
COSPAR ID1988-021A
SATCAT no.18960
Mission duration3 years (planned)
8 years and 4 months
Spacecraft properties
BusIRS-1A
ManufacturerISRO
Launch mass975 kg
Power600 watts
Start of mission
Launch date17 March 1988, 06:43:00 UTC
RocketVostok-2M s/n L15000-79
Launch siteBaikonur, Site 31/6
ContractorOKB-1
End of mission
Last contactJuly 1996
Orbital parameters
Reference systemGeocentric [1]
RegimeSun-synchronous
Perigee altitude863 km
Apogee altitude917 km
Inclination99.01°
Period102.7 minutes
Epoch17 March 1988
 

History

IRS-1A was the first remote sensing mission to provide imagery for various land-based applications, such as agriculture, forestry, geology, and hydrology.[2] The mission's long-term objective was to develop indigenous remote sensing capability.[3]

Spacecraft

The spacecraft platform, measuring 1.56 x 1.66 x 1.10 metres, had the payload module attached on the top and a deployable solar array stowed on either side. Attitude control was provided by four-momentum wheels, two magnetic torques, and a thruster system. Together, they gave an estimated accuracy of better than ± 0.10° in all three axes.[2]

Payloads

IRS-1A carried three "Linear Imaging Self Scanner" cameras, LISS-1, LISS-2A and LISS-2B, with a spatial resolution of 72.5 metres (238 ft) and 36.25 metres (118.9 ft) respectively.[4] The three-axis-stabilised sun-synchronous satellite carried LISS cameras which performed "push-broom" scanning in visible and near-infrared bands to acquire images of the Earth. Local equatorial crossing time was fixed at around 10:30 of the morning.[2]

Mission

IRS-1A was operated in a Sun-synchronous orbit. On 17 March 1988, it had a perigee of 863 kilometres (536 mi), an apogee of 907 kilometres (564 mi), an inclination of 99.01°, and an orbital period of 102.7 minutes.[1]

IRS-1A successfully completed its mission in July 1996 after operating for 8 years and 4 months.

See also

References
  1. "IRS-1A: Trajectory 1988-021A". nssdc.gsfc.nasa.gov. NASA. 17 April 2020. Retrieved 2 May 2020. This article incorporates text from this source, which is in the public domain.
  2. "IRS-1A: Display 1988-021A". nssdc.gsfc.nasa.gov. NASA. 17 April 2020. Retrieved 2 May 2020. This article incorporates text from this source, which is in the public domain.
  3. "Indian Remote Sensing Satellite-1A". CEOS International Directory Network (IDN). Retrieved 8 April 2013.
  4. "IRS (Indian Remote Sensing Satellites) - Overview and early LEO Program of ISRO". eoPortal.org. Retrieved 8 April 2013.
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