LAND OCEAN ATMOSPHERE ENVIRONMENT SOCIETY SPACE INSAT System Indian National Satellite (INSAT) system, established in 1983, is the largest domestic communication satellite system in the Asia-Pacific Region. Presently, INSAT system has constellation of several operational satellites including commercial satellites like INSAT- 3A, INSAT-3C, INSAT-4A, INSAT-4B, INSAT-4CR, GSAT- 8, GSAT-10, GSAT-12, GSAT-14 and GSAT-16. The satellites carry communication payloads in different frequency bands like C, Extended C, Ku, S, UHF bands. Meteorological imaging systems, Data Relay Transponder (DRT), Satellite Aided Search & Rescue (SAS&R) payload and GPS Aided Geo Augmented Navigation (GAGAN) payloads are some of the special purpose payloads that are also carried by these communication satellites. Indian communication satellites are indigenously designed and developed by ISRO. World class facilities are established for assembly, integration and testing of satellites for space-worthiness. A large number of Indian industries are contributing in the satellite building process. At present, the total capacity offered by INSAT system for commercial use including the hired capacity on foreign satellites is about 320 transponders [36 MHz equivalent]. · Payloads in different frequency bands like C, Extended C, Ku, S, UHF bands · Satellites are built using ISRO’s standard I-1K , I-2K, I-3K and I-4K (K = about 1000 kg) bus · The total capacity including the hired capacity on foreign satellites is about 320 transponders [36 Mhz] · Deployment of 10 more communication satellites th during the 12 Five-Year Plan (FYP) period to augment the capacity · Adoption of latest technologies like steerable beams, high throughput using multiple beams, higher frequency bands, high capacity unified modular spacecraft-bus, etc. in future · Capability to realise communication satellites indigenously enabling the self- reliance in meeting Country’s communications needs · Realised and delivered spacecraft to other countries under commercial contracts · Used for not only conventional Satcom applications but also for various societal applications MAJOR HIGHLIGHTS www.isro.gov.in Indian Space Research Organisation VSAT 47.0 DTH 28.5 TV 8.5 DSNG 3.8 Spare 12.3 Utilisation (%) of INSAT System Capacity