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Title: Risat-1  
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Subject: 2012 in spaceflight, RISAT, RISAT-2, Indian Space Research Organisation, USA-234
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Mission type Radar imaging satellite
Operator ISRO
COSPAR ID 2012-017A
SATCAT № 38248
Website .aspx/risat-1/
Mission duration 5 years (planned)
Spacecraft properties
Launch mass 1,858 kilograms (4,096 lb)[1]
Start of mission
Launch date 26 April 2012, 00:17 (2012-04-26T00:17Z) UTC
Rocket PSLV-XL C19
Launch site Satish Dhawan FLP
Orbital parameters
Reference system Geocentric
Regime Sun-synchronous
Inclination 97 degrees
Mean motion 14

Radar Imaging Satellite 1, or RISAT-1, is an RISAT satellite to be launched, it uses C-band 5.35 GHz Synthetic Aperture Radar for earth observation irrespective of the light and weather conditions of the area being imaged.[2]

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.[3][4][5][6]


RISAT-1 had a mass at liftoff of 1,858 kilograms (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. has 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 Mbps data handling system, 50 Newton-metre-second reaction wheels, and a phased array antenna with dual polarisation.[7] Its synthetic aperture radar 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.[2] Most of the design and the installation of basic instrument subsystems for the satellite was conducted in 2010.[8]

The mission has an approximate cost of 4.9 billion (US$79 million);the spacecraft itself cost INR3.78 billion (US$61 million) to develop, and a further INR1.1 billion (US$18 million) to launch.[9] The satellite has a design life of five years.

Synthetic aperture radar allows RISAT-1 to collect data during both day and night and in all weather conditions. The satellite is intended to be used for natural resources management, primarily agriculture planning and forestry surveys, as well as to predict and prevent flooding. It will be used for monitoring paddy plantations and yields in the kharif season and to assist India's food security planning. Pictures from RISAT-1 will be used to estimate the number of hectares being farmed in India, to assess crop health and predict total yield. They can also be used to identify wreckage from aircraft which go down in forested areas.[1] RISAT-1 was not designed as a surveillance satellite, given its reliance on the C-band.[9]

According to ISRO scientists, once the satellite onboard propulsion system will raise the orbital altitude to 536 km with orbital inclination of approximately 97 degrees to place the RISAT-1 into a polar sun-synchronous orbit, the satellite will begin its daily routine of 14 orbits with a repetitive cycle of 25 days. During its mission life of five years, RISAT-1 will use its active microwave remote sensing capability for cloud penetration and day-night imaging of the earth surface and provide critical data inputs for a range of applications.


RISAT-1 was successfully launched at 00:17 UTC (05:47 IST) on 26 April 2012 by a Polar Satellite Launch Vehicle, flight number C19, flying in the PSLV-XL configuration with enhanced solid rocket 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.[10]


  1. ^ a b Varma, M. Dinesh (26 April 2012). "RISAT-1 satellite launch a "grand success": ISRO". Chennai, India: The Hindu. 
  2. ^ a b Raj, N. Gopal (25 April 2012). "RISAT-1's radar can see through clouds and work in darkness". Chennai, India: The Hindu. 
  3. ^ Laxman, Srinivas (26 April 2012). "ISRO Launches India’s First Radar Imaging Satellite, RISAT-1". Asian Scientist. Retrieved 26 April 2012. 
  4. ^ "India to Launch RISAT-2". ASM. Archived from the original on 12 September 2010. Retrieved 25 March 2009. 
  5. ^ "ISRO's New Satellite Could See Through Even Cloudy Sky". Indo Daily. 7 November 2008. Archived from the original on 20 May 2011. Retrieved 21 March 2009. 
  6. ^ "RISAT Is A Home Grown Satellite". Space Mart. 30 March 2009. Archived from the original on 22 May 2009. 
  7. ^ "The importance of RISAT 1". Press Information Bureau, Mumbai. 26 April 2012. Retrieved 26 February 2013. 
  8. ^ "Earth Observation System". ISRO. Archived from the original on 10 October 2008. Retrieved 21 March 2009. 
  9. ^ a b "India successfully launches first microwave radar imaging satellite RISAT – I". The Times of India. 26 April 2012. 
  10. ^ Varma, M. Dinesh (26 April 2012). "PSLV-C19 puts RISAT-1 in orbit". The Hindu (Chennai, India). 
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