Английская Википедия:IRS-1B
Шаблон:Short description Шаблон:Use British English Шаблон:Use dmy dates Шаблон:Infobox spaceflight
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 Шаблон:Cvt and Шаблон:Cvt respectively with a swath width of about Шаблон: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 (Шаблон:Cvt each band ground resolution)
- LlSS-2 (Шаблон: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 Шаблон:Cvt generating a resolution of Шаблон:Cvt and a Шаблон:Cvt swath width. The LISS-2 sensor had eight 2048-element CCD imagers with a focal length of Шаблон:Cvt generating a ground resolution of Шаблон:Cvt and a Шаблон:Cvt swath width. The LISS-2 imager bracketed the LISS-1 imager providing a Шаблон: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 Шаблон:Cvt, an apogee of Шаблон: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
External links
Шаблон:IRS satellites Шаблон:Indian spacecraft Шаблон:Orbital launches in 1991
