Launch Date:26.04.2012


  Radar Satellite-1 (RISAT-1) is the first indigenous microwave satellite designed and developed by ISRO. The satellite carried a Synthetic Aperture Radar (SAR) Payload operating in C-band (5.35 GHz) with both Co and Cross polarisation as well as Circular Polarisation. The satellite enables imaging of the surface features during both day and night under all weather conditions. The payload operates in Fine Resolution Stripmap mode (FRS-1), Fine Resolution Stripmap mode-2 (FRS-2), Medium Resolution ScanSAR mode (MRS) and Coarse Resolution ScanSAR mode (CRS).

The major objectives of RISAT-1:

1. Develop a multimode, agile SAR payload operating in ScanSAR, Strip and Spot modes to provide images with coarse, fine and high spatial resolutions respectively.

2. Establish ground segment to receive and process SAR data

3. To develop newer applications using the microwave data.

Mission Operational Remote Sensing
Orbit 536 km Polar Sun Synchronous
Orbit Inclination 97.55o
Lift-off Mass 1858 kg
Orbit Period 95.49 minutes
Local Time of Equator crossing 6.00 AM/ 6.00 PM
Repetitivity 25 days

C-Band (5.35 GHz) Single/ Dual/ Quad Polarisation, Hybrid Circular Polarimetry

Resolution and Swath:

FRS-1: Resolution 3 m; Swath 25 km

FRS-2: Resolution 6 m; Swath 25 km

FRS-2: Resolution 9 m; Swath 25 km

MRS: Resolution 25 m; Swath 115km

CRS: Resolution 50 m; Swath 223km

Attitude and Orbit Control 3-axis stabilised with reaction wheels, gyros and star sensors, hydrazine based RCS
Power Solar Array generating 2200 W at End Of Life backed by Ni-H2 batteries of 70 AH capacity
Launch date April 26, 2012
Launch site SDSC SHAR Centre, Sriharikota, India
Launch vehicle PSLV – C19
Mission life Five Years (Nominal)
Orbital life In Service