The Indian national satellite system (INSAT) program was established in _____.
1983
The Indian National Satellite System (INSAT) is a series of multipurpose geostationary satellites operated to support telecommunications, television and radio broadcasting, meteorology and satellite-aided search-and-rescue services.
The INSAT programme was established in 1983, with INSAT-1B becoming operational that year and effectively launching the system's regular services; the earlier INSAT-1A, launched in 1982, had failed shortly after commissioning.
Once operational, INSAT rapidly grew into one of the largest domestic communication satellite systems in the Asia-Pacific region, transforming India's broadcasting reach and weather-monitoring capability.
The system is guided by the INSAT Coordination Committee and is jointly used by ISRO, the Department of Telecommunications, the India Meteorological Department, All India Radio, Doordarshan and other user agencies.
Later INSAT and GSAT satellites carried advanced transponders and imaging payloads such as the Very High Resolution Radiometer, extending services to disaster warning and tele-education.
The years 1963 (India's first sounding-rocket launch from Thumba), 1972 (formation of the Space Commission and Department of Space) and 1997 relate to other milestones and are not when INSAT was established.
Hence, the correct answer is 1983.
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