Military & Aerospace

India's Spy Satellite RISAT-1
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Issue Net Edition | Date : 26 Apr , 2012

Radar Imaging Satellite-1 (RISAT-1) is a state of the art Microwave Remote Sensing Satellite carrying a Synthetic Aperture Radar (SAR) payload operating in C-band (5.35 GHz), which enables imaging of the earth surface features during both day and night under all weather conditions.

The satellite provides the capability to carry out surveillance under all conditions – day, night & also cloudy. Besides applications in agriculture, this satellite can be used to carry out missions relating to national security.

The Polar Satellite Launch Vehicle, in its 21st flight (PSLV-C-19) will launch India’s first Radar Imaging Satellite – RISAT-1 into a Polar Circular Orbit with an altitude of 480 km. RISAT-1 weighing 1858 kg is the heaviest satellite being launched by PSLV.

The satellite onboard propulsion system will be used to raise the orbital altitude to 536 km, which orbital inclination of 97.552 to place RISAT-1 into a Polar Sun-Synchronous Orbit.

Active Microwave Remote Sensing provides for cloud penetration and day-night imaging capability. These unique characteristics of C-band Synthetic Aperture Radar enables applications in agriculture, particularly paddy monitoring in kharif season and management of natural disaster like flood and cyclone.

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