NamesRadar Imaging Satellite-1A
Earth Observation Satellite-4
Mission typeImaging radar
Mission duration5 years (planned)
Spacecraft properties
ManufacturerIndian Space Research Organisation
Launch mass1,858 kg (4,096 lb)
Power1850 watts
Start of mission
Launch dateOctober-November 2021(Expected)
RocketPolar Satellite Launch Vehicle, PSLV-C52
Launch siteSatish Dhawan Space Centre, First Launch Pad (FLP)
ContractorIndian Space Research Organisation
Orbital parameters
Reference systemGeocentric orbit[1]
RegimeSun-synchronous orbit
Perigee altitude536 km (333 mi)
Apogee altitude536 km (333 mi)
Period96.50 minutes
Synthetic Aperture Radar (X-band) (SAR-X)

Radar Imaging Satellite-1A, or RISAT-1A, is a planned remote sensing satellite as a follow on to RISAT-1 and with similar configuration. The satellite is being developed by Indian Space Research Organisation (ISRO) and it will be 6th in series of RISAT satellites. It will be a land based mission with primary application in terrain mapping and analysis of land, ocean and water surface for soil moisture.[2]

Satellite description

Synthetic aperture radar can be used for Earth observation irrespective of the light and weather conditions of the area being imaged.[3] The satellite will carry a C-band synthetic-aperture radar (SAR) and will have a liftoff mass of 1,858 kg (4,096 lb).[1]

Payload metrics are defined by the following parameters and areas of study:

Category Parameters
Land Albedo and reflectance
Soil moisture
Multi-purpose imagery
Ocean Ocean topography/currents
Snow & Ice Ice sheet topography
Snow cover, edge and depth
Sea ice cover, edge and thickness


RISAT-1A will be launched on the Polar Satellite Launch Vehicle (PSLV-C52). RISAT-1A is planned to be launched in September 2021.[4]

See also


  1. ^ a b Reddy, O.V. Raghav (3 February 2016). "Future Earth Observation Missions of ISRO, NRSC User Interaction Meet 2016" (PDF). Archived from the original (PDF) on 3 February 2017.
  2. ^ "CEOS Instrument: Synthetic Aperature Radiometer (RISAT)". Retrieved 9 February 2016.
  3. ^ Raj, N. Gopal (25 April 2012). "RISAT-1's radar can see through clouds and work in darkness". The Hindu. Chennai, India.
  4. ^ "SDSC-SHAR Website". shar.gov.in. Archived from the original on 16 July 2021. Retrieved 16 July 2021.