RISAT-1: A Fully Polarimetric C-band SAR Mission of ISRO

R.R. Navalgund, Space Applications Centre,
Jodhpur Tekra, Ahmedabad 380 015, India

RISAT-1 in fully deployed mode

RISAT-1 in fully deployed mode

RISAT (Radar Imaging Satellite)-1 is a series of Indian radar imaging reconnaissance satellites being built by ISRO to provide all-weather surveillance using Synthetic Aperture Radars (SAR). Radar imaging satellite (RISAT-1) is scheduled to be launched in mid-2011 for enhancing the scope of remote sensing applications and services using microwave data. The synthetic aperture radar onboard RISAT will have ability to acquire data at C-band in different mode of polarization, incidence angle and resolution. The RISAT SAR will operate at C-band (5.35 GHz) at various beam modes having a number of combinations of linear polarization modes as well as circular polarization modes, incidence angle, swath of 200-600 km and resolution varying between 3 to 50 m from a nominal altitude of 536 km. The System will have capability of left as well as right looking. It will operate in four basic modes, (i) Fine Resolution Strip map Mode (FRS) will provide nominal single look 3 m – 8 m resolution image over 30 km swath in either single, dual or quad polarization, (ii) Medium Resolution ScanSAR Mode (MRS) will provide nominal single look 25 m resolution image over swath of 120 km, (iii) Coarse Resolution ScanSAR Mode (CRS) will provide nominal two look 50 m resolution image over swath of 240 km and (iv) High Resolution Spotlight Mode (HRS) will have a spot of 10 km (Azimuth) and 10 km (ground range swath) for either single or dual polarization.

For details, contact: R.R. Navalgund, Director, Space Applications Centre (ISRO), Ahmedabad 380015, India. director@sac.isro.gov.in