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

thduring 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

DTH28.5

TV8.5

DSNG 3.8

Spare 12.3

Utilisation (%) of INSAT System Capacity

www.isro.gov.in Indian Space Research Organisation

GSAT-11

· Multibeam satellite with about 10 Gbps throughput

· 32 User beams in Ku-band, 4 colour-frequency reuse

· Hub communication in Ka-band

· Use of latest technologies like multiple spot beams, onboard RF tracking, high capacity modular bus supporting 4000-6000 kg mass, etc.

LAND OCEAN ATMOSPHERE ENVIRONMENT SOCIETY SPACE

GSAT-6

· Multibeam S-band satellite

· Use of multiple spot beams for reuse of frequency

· Six meter unfurlable antenna for enabling communication using small, portable and mobile terminals

GSAT-17

· 36 C & Ext C Transponders to augment the transponder capacity

· DRT, SAS&R and MSS payloads for continuity of services

· ISRO’s standard I-3K bus

GSAT-Ka

· Multibeam High throughput satellite in Ka-band

· Possible use of latest technologies like steerable beams, electrical propulsion, deployable thermal radiators, etc.

GSAT-19E

· Payload for the first developmental flight of GSLV MK-III

· Experimental satellite to act as test bed for several new technologies like unified modular bus, deployable thermal radiators, electrical propulsion, indigenous Li-Ion batteries and C-band TWTAs, optical payload, etc.

MAJOR PLANNED SATELLITES