IRS-1B, Indian Remote Sensing satellite-1B, the second of the series of indigenous state-of-art remote sensing satellites, was successfully launched into a polar Sun-synchronous orbit on 29 August 1991 from the Soviet Cosmodrome at Baikonur. IRS-1B carries two sensors, LISS-1 and LISS-2, with resolutions of Template:Cvt and Template:Cvt respectively with a swath width of about Template:Cvt during each pass over the country. It was a part-operational, part-experimental mission to develop Indian expertise in satellite imagery. It was a successor to the remote sensing mission IRS-1A, both undertaken by the Indian Space Research Organisation (ISRO).[1]
History
IRS-1B was the second remote sensing mission to provide imagery for various land-based applications, such as agriculture, forestry, geology, and hydrology.[2]
Satellite description
Improved features compared to its predecessor (IRS-1A): gyroscope referencing for better orientation sensing, time tagged commanding facility for more flexibility in camera operation and line count information for better data product generation.[1]
The satellite was a box-shaped 1.56 m x 1.66 m x 1.10 metres bus with two Sun-tracking solar panels of 8.5 square metres each. Two nickel-cadmium batteries provided power during eclipses. The three-axis stabilised Sun-synchronous satellite had a 0.4° pitch/roll and 0.5° yaw pointing accuracy provided by a zero-momentum reaction wheel system utilising Earth/Sun/star sensors and gyroscopes.[2]
Instruments
IRS-1B carried two solid state push broom scanner Linear Imaging Self-Scanning Sensor (LISS):
- LISS-1 (Template:Cvt each band ground resolution)
- LlSS-2 (Template:Cvt each band ground resolution) [3]
The satellite carried two LISS push broom CCD sensors operating in four spectral bands compatible with Landsat Thematic Mapper and Spot 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 Template:Cvt generating a resolution of Template:Cvt and a Template:Cvt swath width. The LISS-2 sensor had eight 2048-element CCD imagers with a focal length of Template:Cvt generating a ground resolution of Template:Cvt and a Template:Cvt swath width. The LISS-2 imager bracketed the LISS-1 imager providing a Template:Cvt overlap. Data from the LISS-1 were downlinked on S-band at 5.2 Mbps and from the LISS-2 at 10.4 Mbps to the ground station at Shadnagar, India. The satellite was controlled from Bangalore, India.[2]
Mission
IRS-1B was operated in a Sun-synchronous orbit. On 29 August 1991, it had a perigee of Template:Cvt, an apogee of Template:Cvt, an inclination of 99.2°, and an orbital period of 102.7 minutes.[4]
IRS-1B successfully completed its mission on 1 July 2001, after operating for 10 years.[5]
See also
References
- ↑ 1.0 1.1 IRS-1B. ISRO. Retrieved 3 May 2020.
- ↑ 2.0 2.1 2.2 Display: IRS-1B 1991-061A. NASA(27 April 2021). Retrieved 12 May 2021. Template:PD-notice
- ↑ IRS (Indian Remote Sensing Satellites). ESA Earth Observation Portal. Retrieved 12 May 2021.
- ↑ Trajectory: IRS-1B 1991-061A. NASA(27 April 2021). Retrieved 12 May 2021. Template:PD-notice
- ↑ IRS-1B. World Meteorological Organization(28 July 2015). Retrieved 12 May 2021.Template:Dead link
External links
Template:IRS satellites Template:Indian spacecraft Template:Orbital launches in 1991