Orbit Altitude: 904 km
Orbit Inclination: 99 deg
Period: 103 min
Repeat Cycle: 22 days
Perigee: 887 km
Apogee: 922 km
Orbit Type: LEO > Low Earth Orbit > Polar Sun-Synchronous

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The Indian Remote Sensing Satellite-1B (IRS-1B) was launched on August 8, 1991, from Tyuratan, U.S.S.R.. IRS-1B continues the series of Earth resources remote sensing satellites developed by Indian ... Space Research Organisation (ISRO) for land-based applications such as agriculture, forestry, geology, and hydrology. The spacecraft is 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 provide power during eclipses. The three-axis stabilize 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.

http://www.isro.gov.in/satellites/irs-1b.aspx