Wednesday, December 3, 2008
With the above scenario, India has a lead in the civilian remote sensing field in the world not only in terms of realisation and launching of complex satellites with high, medium and coarse resolution cameras, but also in the application areas as well. In order to maintain this lead and also provide continuity of data to global users, Cartosat-1 with two improved fore and aft PAN cameras with better than 2.5 m. spatial resolution is planned to be realised for launch by middle of 2003. This paper briefly presents the technical elements and the planned data products of the Cartosat-1 spacecraft.
Thursday, April 10, 2008
|Launch Date||May 5, 2005|
|Launch Location||Sriharikota, India|
|Nominal Altitude||617.99 km|
|Orbits Per Day||15|
|Orbital Repeat Cycle||116 days|
|Nominal Wait Time to Acquire Adj.Path||11 days|
|Max. Wait Time for Revisit||5 days|
|Node for P/L Operations||Descending Node|
|Local Time for Equatorial Crossing||10:30 AM|
|Semi-major axis||6996.128 km|
CARTOSAT-1 carries two panchromatic cameras that take black-and-white stereoscopic pictures in the visible region of the electromagnetic spectrum. The satellite images have a spatial resolution of 2.5 meter and cover a swath of 30 km. The cameras are mounted on the satellite in such a way that near simultaneous imaging of the same area from two different angles is possible. This facilitates the generation of accurate three-dimensional maps. The cameras maneuver across the direction of the satellite's movement to facilitate the imaging of an area more frequently. The images taken by CARTOSAT-1 cameras are compressed, encrypted, formatted and transmitted to the ground stations.
CARTOSAT-1 also carries a Solid State Recorder with a capacity of 120 Giga Bits to store the images taken by its cameras. The stored images can be transmitted when the satellite comes within the visibility zone of a ground station.
After its separation from the fourth stage of PSLV, CARTOSAT-1 is made to accurately point towards the earth through a series of complex maneuvers. This is followed by a thorough checkout of the satellite, switching on the cameras and fine tuning of the orbit.