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RISAT-1
Radar Imaging Satellite 1 or RISAT-1, was an Indian remote sensing satellite built and operated by the Indian Space Research Organisation (ISRO). The second RISAT satellite to be launched, it used a C-band 5.35 GHz synthetic-aperture radar (SAR) for Earth observation.
The launch of RISAT-1 came several years after that of RISAT-2, which carried an Israeli-built X-band radar. The RISAT-2 mission was prioritised over RISAT-1 following the 2008 Mumbai attacks, resulting in RISAT-1 being delayed by several years.
RISAT-1 had a mass at liftoff of 1,858 kg (4,096 lb), making it the heaviest Earth observation satellite to be launched by India, and the heaviest satellite to be launched using a Polar Satellite Launch Vehicle. It had the capability to take images of Earth during day and night, as well as in cloudy conditions.
The satellite is equipped with a 160 × 4 Mbit/s data handling system, 50 Newton-metre-second reaction wheels, and a phased array antenna with dual polarisation.
The mission has an approximate cost of ₹4.90 billion (US$58 million);the spacecraft itself cost ₹3.79 billion (US$45 million) to develop, and a further ₹1.11 billion (US$13 million) to launch. The satellite had a design life of five years.
The satellite was used for natural resources management, primarily agriculture planning and forestry surveys, as well as to predict and prevent flooding. It was used for monitoring paddy plantations and yields in the kharif season and to assist India's food security planning. Pictures from RISAT-1 was used to estimate the number of hectares being farmed in India, to assess crop health and predict total yield. It was also used to identify wreckage from aircraft that crashed in forested areas. RISAT-1 was not designed as a surveillance satellite, given its reliance on the C-band.
Its synthetic-aperture radar (SAR-C) has a resolution of 3 m to 50 m. It also supports a spotlight mode for prolonged focus on a given geographical area at a resolution of 1 m. Most of the design and the installation of basic instrument subsystems for the satellite was conducted in 2010.
RISAT-1 was launched at 00:17 UTC (05:47 IST) on 26 April 2012 by a Polar Satellite Launch Vehicle, flight number C19, flying in the XL configuration with extended length solid strap-on boosters. The launch, which was the third flight of the PSLV-XL configuration, took place from the First Launch Pad of the Satish Dhawan Space Centre in Sriharikota, Andhra Pradesh. The launch marked the twenty-first flight of the PSLV, and its nineteenth successful launch.
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RISAT-1
Radar Imaging Satellite 1 or RISAT-1, was an Indian remote sensing satellite built and operated by the Indian Space Research Organisation (ISRO). The second RISAT satellite to be launched, it used a C-band 5.35 GHz synthetic-aperture radar (SAR) for Earth observation.
The launch of RISAT-1 came several years after that of RISAT-2, which carried an Israeli-built X-band radar. The RISAT-2 mission was prioritised over RISAT-1 following the 2008 Mumbai attacks, resulting in RISAT-1 being delayed by several years.
RISAT-1 had a mass at liftoff of 1,858 kg (4,096 lb), making it the heaviest Earth observation satellite to be launched by India, and the heaviest satellite to be launched using a Polar Satellite Launch Vehicle. It had the capability to take images of Earth during day and night, as well as in cloudy conditions.
The satellite is equipped with a 160 × 4 Mbit/s data handling system, 50 Newton-metre-second reaction wheels, and a phased array antenna with dual polarisation.
The mission has an approximate cost of ₹4.90 billion (US$58 million);the spacecraft itself cost ₹3.79 billion (US$45 million) to develop, and a further ₹1.11 billion (US$13 million) to launch. The satellite had a design life of five years.
The satellite was used for natural resources management, primarily agriculture planning and forestry surveys, as well as to predict and prevent flooding. It was used for monitoring paddy plantations and yields in the kharif season and to assist India's food security planning. Pictures from RISAT-1 was used to estimate the number of hectares being farmed in India, to assess crop health and predict total yield. It was also used to identify wreckage from aircraft that crashed in forested areas. RISAT-1 was not designed as a surveillance satellite, given its reliance on the C-band.
Its synthetic-aperture radar (SAR-C) has a resolution of 3 m to 50 m. It also supports a spotlight mode for prolonged focus on a given geographical area at a resolution of 1 m. Most of the design and the installation of basic instrument subsystems for the satellite was conducted in 2010.
RISAT-1 was launched at 00:17 UTC (05:47 IST) on 26 April 2012 by a Polar Satellite Launch Vehicle, flight number C19, flying in the XL configuration with extended length solid strap-on boosters. The launch, which was the third flight of the PSLV-XL configuration, took place from the First Launch Pad of the Satish Dhawan Space Centre in Sriharikota, Andhra Pradesh. The launch marked the twenty-first flight of the PSLV, and its nineteenth successful launch.
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