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The Indian Remote Sensing Satellite-1B (IRS-1B) continued the series of Earth resources remote sensing satellites developed by India for land-based applications such as agriculture, forestry, geology, and hydrology. The spacecraft was a box-shaped 1.6 x 1.56 x 1.1 meter bus with two Sun-tracking solar arrays of 8.5 square meters each. Two nickel cadmium batteries provided power during eclipses. The three-axis stabilized sun-synchronous satellite had a 0.4 degree pitch/roll and 0.5 degree yaw pointing accuracy provided by a zero-momentum reaction wheel system utilizing Earth/Sun/star sensors and gyros. The satellite carried three Linear Imaging Self-Scanning (LISS) push-broom CCD sensors operating in four spectral bands compatible with Landsat Thematic Mapper and Spor HRV data. The bands were 0.45 - 0.52, 0.52 - 0.59, 0.62 - 0.68, and 0.77 - 0.86 microns. The LISS 1 sensor had four 2048-element CCD imagers with a focal length of 162.2 cm generating a resolution of 72.5 meters and a 148 km swath width. The LISS 2A/B sensors had eight 2048-element CCD imagers with a focal length of 324.4 mm generating a ground resolution of 36.25 meters and a 74 km swath width. The two LISS 2 imagers bracketed the LISS 1 imager providing a 3 km overlap. Data from the LISS 1 were downlinked on S-band at 5.2 Mbps and from the LISS 2 A/B at 10.4 Mbps to the ground station at Shandnager, India. The satellite was controlled from Bangalore, India.

Alternate Names

  • Indian Remote Sensing Satellite 1B
  • 21688

Facts in Brief

Launch Date: 1991-08-29
Launch Vehicle: SLV-3
Launch Site: Tyuratam (Baikonur Cosmodrome), U.S.S.R
Mass: 975 kg
Nominal Power: 620 W

Funding Agency

  • Indian Space Research Organization (India)


  • Earth Science

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. K. KasturiranganGeneral ContactIndian Space Research
Dr. P. N. JayaramanProject ScientistIndian Space Research Organization
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