| Operator | ISRO |
|---|---|
| Mission type | Radar imaging |
| Launch date | 26 April 2012, 00:17 UTC |
| Carrier rocket | PSLV-XL |
| Launch site | Satish Dhawan Space Centre FLP |
| Mission duration | 5 years (planned) |
| COSPAR ID | 2012-017A |
| Mass | 1,850 kilograms (4,100 lb) |
| Power | Solar |
| Instruments | |
| Spectral band | C-band |
| Imaging resolution | 1m - 50m[1] |
RISAT-1 (short for Radar Imaging Satellite - 1) is the first of the RISAT series of Indian remote sensing satellites built by the Indian Space Research Organisation(ISRO). It uses a C-band Synthetic Aperture Radar (SAR) for all-weather earth observation.
According to ISRO officials, RISAT-1 at 1,850 kilograms (4,100 lb) is the heaviest microwave satellite to be built by India. While the RISAT-1 was the first satellite of the RISAT series to be built, and the second to be launched.[2] RISAT-1 was successfully launched by ISRO's PSLV-XL rocket on 26 April 2012.
Previous Indian remote sensing satellites relied mainly on optical and infrared sensors. RISAT-1 uses an indigenously developed C-band SAR, operating in multi-polarisation, multi-resolution modes.[2]
The fabrication and launch of RISAT-1 was postponed in the aftermath of the 2008 Mumbai attacks in order to prioritize the launch of RISAT-2 with its X-band SAR of Israeli origin.[3][4][5]
The features of RISAT include:
- 160 x 4 Mbps data handling system
- 50 Newton-meter-second reaction wheels
- SAR antenna deployment mechanism
- Phased array antenna with dual polarisation
RISAT-1 has a resolution of 3m-50m. It also supports a spotlight mode for prolonged focus on a given geographical area at a resolution of 1m.[1] Most of the design and the installation of basic instrument subsystems for the satellite was done in 2010.[6]
[edit]Applications
The satellite would be used for disaster prediction and agriculture forestry, and the high resolution pictures and microwave imaging could also be used for defence purposes. The SAR sensor enables the satellite to collect data during both day and night in all weather conditions.
Reference
- ^ a b "RISAT-1's radar can see through clouds and work in darkness". The Hindu. 2012-04-25.
- ^ a b "ISRO to launch a breakthrough satellite". The Hindu. 17 February 2009. Retrieved 2009-03-21.
- ^ "The difference between Risat-1 and Risat-2". ASM. Retrieved 2009-03-25.
- ^ "ISRO's New Satellite Could See Through Even Cloudy Sky". Indo Daily. November 7, 2008. Retrieved 2009-03-21.
- ^ Launch Info
- ^ "Earth Observation System". ISRO. Retrieved 2009-03-21.[dead link]
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