Technology Experiment Satellite
) is an experimental satellite
In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavour. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon....
to demonstrate and validate, in orbit, technologies that could be used in the future satellites of Indian Space Research Organization (ISRO). TES weighs 1108 kg and was successfully placed in 568 km sun synchronous orbit on October 22, 2001 using the PSLV-C3 version of Polar Satellite Launch Vehicle
The Polar Satellite Launch Vehicle , commonly known by its abbreviation PSLV, is an expendable launch system developed and operated by the Indian Space Research Organisation . It was developed to allow India to launch its Indian Remote Sensing satellites into sun synchronous orbits, a service that...
. PSLV-C3 also injected two more satellites: PROBA
PROBA is a satellite launched by ISRO in 2001 as part of the ESA's MicroSat program. This small boxlike system, with solar panel collectors on its surface, has remarkable image-making qualities. It hosts two Earth Observation instruments dubbed CHRIS and HRC...
, a Belgian satellite and BIRD, a German satellite.
The technologies demonstrated in TES are attitude and orbit control system, high torque reaction wheels, new reaction control system with optimized thrusters and a single propellant tank, light weight spacecraft structure, solid state recorder, X-band phased array antenna, improved satellite positioning system, miniaturized TTC and power system and, two-mirror-on-axis camera optics.
The Technology Experiment Satellite (TES) has a pan chromatic camera for remote sensing. The camera is which is capable of producing images of 1 meter resolution
Optical resolution describes the ability of an imaging system to resolve detail in the object that is being imaged.An imaging system may have many individual components including a lens and recording and display components...
. 1 m resolution means the camera is able to distinguish between two objects which are separated at least a meter.
The launch of TES made India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...
the second country in the world after the United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
that can commercially offer images with one meter resolution. It is used for remote sensing of civilian areas, mapping industry and geographical information services.
TES, which was launched in 2001, helped the US army with high-resolution images during the 9/11 counter against the