April – 8 – 2009 Sriharikota space port
news confirmed by PTI
India will launch a spy satellite from Sriharikota spaceport on April 20 primarily to keep an eye on its borders round-the-clock and help the Government in anti-infiltration and anti-terrorist operations.
The 300-kg radar-imaging satellite has been built by Israel and is set to blast-off on board India’s home-grown rocket, the Polar Satellite Launch Vehicle (PSLV).
This remote-sensing advanced imaging satellite, to be positioned 550 km above the earth, has all-weather capabilities.
It carries Synthetic Aperture Radar (SAR) payload, which can take images during day, night and all weather conditions including under cloud cover, a capability that Indian satellites do not have.
Two main properties distinguish SAR from optical imagery,the SAR is an active instrument, it generates its own illumination of the scene to be viewed just similar to a camera with flash,the satellite,s illunination is coherent meaning all the light is in phase just like a laser so it does not disperse over the distance between the satellite and the earth’s surface. SAR radar can measure both intensity and phase of the reflected light leading to high texture and three dimensational capabilities,SAR can detect small changes over time in a given geographical area as proved by measuring phase differences in exactly aligned images of the same ground area
Indian Space Research Organisation is tight-lipped over the mission, not giving out much details.
A senior ISRO official, who spoke to PTI on condition of anonymity, said that the significance of the satellite is its all-weather capability.
“It will be primarily used for defence and surveillance. The satellite also has good application in the area of disaster management and in managing cyclones, floods and agriculture-related activities,” he said.
sections from PTI