RISAT-1
Encyclopedia
RISAT-1 is the first of the RISAT
series of India
n remote sensing
satellite
s built by the Indian Space Research Organisation
(ISRO). The satellite uses a Synthetic Aperture Radar
(SAR) for all-weather earth observation.
While the 1780 kilograms (3,924.2 lb) RISAT-1 was the first satellite of the RISAT series to be built, it will be the second to be launched. As of October 2011, RISAT-1 was in queue for launch by ISRO's Polar Satellite Launch Vehicle
(PSLV).
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.
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.
The features of RISAT include:
Most of the design and the installation of basic instrument subsystems for the satellite was done in 2010. The satellite was ready for launch by mid-2011.
RISAT
RISAT is a series of Indian radar imaging reconnaissance satellites built by ISRO. They provide all-weather surveillance using synthetic aperture radars ....
series of India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...
n remote sensing
Remote sensing
Remote sensing is the acquisition of information about an object or phenomenon, without making physical contact with the object. In modern usage, the term generally refers to the use of aerial sensor technologies to detect and classify objects on Earth by means of propagated signals Remote sensing...
satellite
Satellite
In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavour. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon....
s built by the Indian Space Research Organisation
Indian Space Research Organisation
The Indian Space Research Organisation is an independent Indian governmental agency established in 1969 for the research and development of vehicles and activities for the exploration of space within and outside of Earth’s atmosphere. Headquartered in Bangalore...
(ISRO). The satellite uses a Synthetic Aperture Radar
Synthetic aperture radar
Synthetic-aperture radar is a form of radar whose defining characteristic is its use of relative motion between an antenna and its target region to provide distinctive long-term coherent-signal variations that are exploited to obtain finer spatial resolution than is possible with conventional...
(SAR) for all-weather earth observation.
While the 1780 kilograms (3,924.2 lb) RISAT-1 was the first satellite of the RISAT series to be built, it will be the second to be launched. As of October 2011, RISAT-1 was in queue for launch by ISRO's Polar Satellite Launch Vehicle
Polar Satellite Launch Vehicle
The Polar Satellite Launch Vehicle , commonly known by its abbreviation PSLV, is an expendable launch system developed and operated by the Indian Space Research Organisation . It was developed to allow India to launch its Indian Remote Sensing satellites into sun synchronous orbits, a service that...
(PSLV).
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.
The fabrication and launch of RISAT-1 was postponed in the aftermath of the 2008 Mumbai attacks
2008 Mumbai attacks
The 2008 Mumbai attacks were more than 10 coordinated shooting and bombing attacks across Mumbai, India's largest city, by Islamist attackers who came from Pakistan...
in order to prioritize the launch of RISAT-2
RISAT-2
RISAT-2, or Radar Imaging Satellite 2 is an Indian radar reconnaissance satellite that is part of India's RISAT programme. It was successfully launched aboard a PSLV-CA at 01:15 GMT on April 20, 2009 from the Second Launch Pad at the Satish Dhawan Space Centre...
with its X-band SAR of Israeli origin.
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
Most of the design and the installation of basic instrument subsystems for the satellite was done in 2010. The satellite was ready for launch by mid-2011.