It gives me immense pleasure to welcome you to the Space Applications Centre's (SAC) website. I hope you shall find it interesting and informative. SAC, one of the major Centres of the Indian Space Research Organisation (ISRO), was established in 1973 by amalgamating several theme based units of ISRO in Ahmedabad - first such unit having been established as Experimental Satellite Communications Earth Station (ESCES), in 1967. SAC is engaged in design and development of remote sensing, communication and navigation payloads. Remote sensing payloads involve development of sensors in optical, IR and microwave regions of the EM spectrum for earth and planetary observations, enabling survey of natural resources, land, ocean, atmospheric and planetary studies. Communication payloads involve realization of transponders for telecommunications, TV and radio broadcasting, tele–medicine and tele-education

purposes.The Centre is also deeply engaged in harnessing space technology for societal benefits like food security, rural development, education and literacy, health care and environment, survey and optimum use of natural resources and disaster monitoring and mitigation related activities.In this direction it has come a long way in developing earth observation sensors starting with 1 km resolution images from Bhaskara-I to the recent state of the art sensors with sub meter resolution and stereoscopic imaging capabilities. It is developing microwave sensors with all weather and day and night capabilities.

Through the launch of satellites in IRS -1 series, RESOURCESAT-1, RESOURCESAT-2, OCEANSAT-2, CARTOSAT-1, CARTOSAT-2, Kalpana, INSAT-3A (VHRR and CCD payloads), Megha-Tropiques, etc., SAC has acquired capability to realise state-of-the-art sensors. Data from these satellites is being used in collaboration with several user agencies in the areas of crop acreage and yield assessments, forestry, monitoring of glaciers, land use planning, coastal zone regulation, fisheries, deriving parameters related to sea and atmosphere for meteorological forecasts and for disaster monitoring.

In the field of satellite communication, SAC has acquired capabilities in developing and realising communication transponders in UHF, S, C, Ku and Ka bands with spot beam, national beam and configurable beam capabilities. It all started with developing the first experimental communication satellite – APPLE - in the seventies which was followed by procured and custom-designed INSAT-1 series. INSAT-2, INSAT-3 and INSAT-4 series and GSAT series have all been designed in-house, but launched through hired launchers. The design of new communication transponders is aimed at providing additional capabilities for tele-education, tele-medicine, mobile and distress alerts communication, DTH, digital sound broadcasting, etc.

In the field of navigation, payloads for GAGAN and IRNSS are realized at Space Applications Centre.

We also look forward to developing sensors with higher spatial and spectral resolutions, imagers and sounders for vertical profiling of atmosphere, more versatile microwave sensors for monitoring sea, atmosphere and other resources, for inter-planetary missions like Chandrayaan and for developing advanced and more versatile image processing and data utilisation techniques.

The next generation communication payloads demanding high throughput capabilities are being designed and developed in the centre.

A large number of projects are realized through academic institutions enabling capacity building in the country. Significant efforts are on to realize the hardware and software required for payload development through indigenous sources thereby promoting self reliance.


( A. S. Kiran Kumar )