NamesRadar Imaging Satellite-2B
Mission typeEarth observation
Radar imaging satellite
disaster management)
COSPAR ID2019-028A
SATCAT no.44233
Mission duration5 years (planned)
2 years, 4 months and 27 days (in progress)
Spacecraft properties
ManufacturerIndian Space Research Organisation
Launch mass615 kg (1,356 lb)
Power2000 watts
Start of mission
Launch date22 May 2019, 00:00 UTC
RocketPolar Satellite Launch Vehicle-CA, PSLC-C46
Launch siteSatish Dhawan Space Centre, First Launch Pad (FLP)
ContractorIndian Space Research Organisation
Entered serviceAugust 2019
Orbital parameters
Reference systemGeocentric orbit
RegimeSun-synchronous orbit
Altitude555 km (345 mi)
Period93.0 minutes
Synthetic Aperture Radar (X-band) (SAR-X)

RISAT-2B, or Radar Imaging Satellite-2B is an Indian radar reconnaissance satellite that is part of India's RISAT programme and the third satellite in the series. It is built by Indian Space Research Organisation (ISRO) to replace RISAT-2.


RISAT-2B satellites will succeed India's ten-year-old RISAT-2 spacecraft. Equipped with X-band radar imagers, RISAT-2B monitors the Earth day and night, in any weather conditions. RISAT uses a technique called Synthetic Aperture Radar (SAR) to build images of the Earth below it. Signals transmitted from the satellite are reflected from the surface and its echo is recorded when it reaches back to the satellite. These signals can then be processed to build a profile of the ground below. The RISAT constellation is operated by the ISRO. While ISRO states the satellites applications as supporting agriculture, forestry and disaster management, their primary purpose is military surveillance.[1]

RISAT-2B can operate in different modes including Very High Resolution Radar (VHRR) imaging modes of 1 × 0.5 m resolution and 0.5 × 0.3 m resolution. It is placed in an inclined orbit for better revisit rates over area of interest. Being a radar imaging satellite, RISAT-2B can image during day or night and in all weather conditions.[2]

Satellite description

RISAT-2B's main sensor is an indigenously developed synthetic-aperture radar (SAR) imaging satellite operating in X-band with 3.6 m radial rib antenna. The satellite is utilized for high resolution spot imaging of locations of interest and it has a mass of 615 kg (1,356 lb).[3]


It was successfully launched aboard a Polar Satellite Launch Vehicle (PSLV-C46) launch vehicle at 00:00 UTC on 22 May 2019 from the First Launch Pad at the Satish Dhawan Space Centre.[4][5]

See also


  1. ^ "Display: RISAT-2B 2019-028A". NASA. 27 April 2021. Retrieved 14 May 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  2. ^ "Earth Observation Satellite RISAT-2B". Press Information Bureau - Government of India. 4 July 2019. Retrieved 15 May 2021.
  3. ^ "RISAT-2B: Radial Rib Antenna". ISRO. 22 May 2019. Retrieved 15 May 2021.
  4. ^ "PSLV-C46 / Risat-2B mission a success, ISRO places radar imaging earth observation satellite in orbit". The Times of India. 22 May 2019. Retrieved 15 May 2021.
  5. ^ "India Successfully Launches RISAT-2B Earth-Observation Satellite". SPACE.com. Retrieved 15 May 2021.