INSAT–4CR spacecraft is configured with exclusive Ku band employing the I-2K Bus with a mass of 2130 Kg. It was injected into the orbit by GSLV-F04 rocket with enhanced Russian Cryogenic engine and co-located at 74o East longitude along with INSAT–3C / Kalpana–1 / GSAT–3 (EDUSAT).
INSAT-4CR carries 12 high-power Ku-band transponders designed to provide Direct-to-home (DTH) television services, Video Picture Transmission (VPT) and Digital Satellite News Gathering (DSNG).
INSAT–4B Spacecraft is the second in the INSAT 4 series of spacecrafts and is configured with exclusive communication payloads to provide services in Ku and C frequency bands. This is co-located with INSAT–3A at 93.5 o E longitude.
Mission
Communication
Weight
3025 Kg (at Lift – off)
Onboard Power
5859 W
Stabilization
It uses 3 earth sensors, 2 digital sun sensors, 8 coarse analog sun sensors, 3 solar panel sun sensors and one sensor processing electronics. The wheels and wheel drive electronics were imported with indigenous wheel interface module to interface the wheel drive electronics and AOCE.
Propulsion
The propulsion system is employing 16 thrusters, 4 each located on east, west and AY sides and 2 each on north and south sides. There is one 440 N liquid apogee motor (using Mono Methyl Hydrazine (MMH) as fuel and oxides of Nitrogen ( MON3 as oxidizer) and three presurant tanks mounted on the LAM deck.
Payload
12 Ku band high power transponders covering Indian main land using 140W radiatively cooled TWTAs.
12 C band high power transponders with extended coverage, covering southeast and northwest region apart from Indian main land using 63 W TWTAs
INSAT-4A, first in INSAT-4 Satellites series provides services in Ku and C-band frequency bands. The Ku transponders cover the Indian main land and C-Band transponders cover an extended area. It has a dozen Ku transponders and another dozen of C-band transponders. This spacecraft is placed at 83o E along with INSAT-2E and INSAT-3B, by Ariane launch vehicle (ARIANE5-V169).
Spacecraft Mass
Lift off 3081 Kg
Dry Mass 1386.55 Kg
Orbit
Geostationary ( 83o E)
Power
Solar Array to provide a power of 5922 W
Battery
Three 70 Ah Ni H2 Batteries for eclipse support of 4264 W
GSAT-3, known as EDUSAT is meant for distant class room education from school level to higher education. This is the first dedicated "Educational Satellite" that provide the country with satellite based two way communication to class room for delivering educational materials.
This is a Geo-synchronous satellite developed on I-2K bus. GSAT-3 is co-located with METSAT(KALPANA-1) and INSAT-3C at 74o E longitude.
Mission
Education
Spacecraft Mass
1950.5 Kg mass (at Lift - off)
819.4 Kg (Dry mass)
Onboard power
Total four solar panel of size 2.54 M x 1.525 M generating 2040 W (EOL), two 24 AH NiCd batteries for eclipse support
Stabilization
3 axis body stabilised in orbit using sensors, momentum and reaction wheels, magnetic torquers and eight 10 N & 22N reaction control thrusters.
Propulsion
440 N Liquid Apogee Motor with MON - 3 and MMH for orbit raising
Payload
Six upper extended C - band transponders
Five lower Ku band transponders with regional beam coverage
One lower Ku band National beam transponder with Indian main land coverage
Ku beacon
12 C band high power transponders with extended coverage, covering southeast and northwest region apart from Indian main land using 63 W LTWTAs
INSAT-3E is the fourth satellite launched in the INSAT-3 series. It is an exclusive communication satellite to further augment the communication services that are being provided by the INSAT System. Weighing 2775 kg at lift-off, INSAT-3E carries 24 Normal C-band and 12 Extended C-band transponders.
GSAT-2 is a 2000 kg class experimental communication satellite onboard the second developmental test flight of India's Geosynchronous Satellite Launch Vehicle, GSLV-D2. The satellite carries four C-band transponders, two Ku-band transponders and a Mobile Satellite Service (MSS) payload operating in S-band and C-band for forward link and return link respectively.
GSAT-2 also carries four scientific experimental payloads - Total Radiation Dose Monitor (TRDM), Surface Charge Monitor (SCM), Solar X-ray Spectrometer (SOXS) and Coherent Radio Beacon Experiment (CRABEX).
INSAT–3A, the third satellite in INSAT–3 series is a multipurpose satellite for providing telecommunications, television broadcasting, meteorological and search and rescue services. It carries twenty four transponders – twelve operating in the normal C – band frequency, six in extended C band and six in Ku–band. INSAT–3A also carries a Ku–band beacon.
For Meteorological observation, INSAT–3A carries a three channel Very High Resolution Radiometer (VHRR). In addition, INSAT–3A carries a Charge Coupled Device (CCD) camera which operates in the visible and short wave infrared bands providing a spatial resolution of 1 km.
A Data Relay Transponder (DRT) operating in UHF band is incorporated for real time hydro meteorological data collection from unattended located on land and river basins. The data is then relayed in extended C–band to a central location.
INSAT–3A also carries another transponder for Satellite Aided Search and rescue (SA&R) as part of India’s contribution to the international Satellite Aided Search Programme.
Mission
Telecommunication, broadcasting and Meteorology
Spacecraft Mass
2,950 Kg (Mass at Lift–off)
1,348 Kg (Dry mass)
Onboard power
3,100 W
Stabilization
3 – axis body stabilised in orbit using momentum and reaction wheels, solar flaps, magnetic torquers and eight 10 N and eight 22 N reaction control thrusters
Propulsion
440 N Liquid Apogee Motor with MON-3 (Mixed Oxides of Nitrogen) and MMH (Mono Methyl Hydrazine) for orbit raising
Payload
Communication payload
- 12 C – band transponders,
- 6 upper extended C band transponders
- 6 Ku band transponders
- 1 Satellite Aided Search & Rescue transponders
Meteorological payload
- Very High Resolution Radiometer (VHRR) with 2 km resolution in visible band and 8 km resolution in infrared and water vapour band
- Charged Coupled Device (CCD) camera operating in visible, near infrared and shortwave infrared band with 1 km resolution.
METSAT (renamed as Kalpana - 1 on February 5, 2003 after the Indian born American Astronaut Dr. Kalpana Chawla, who died on February 1, 2003 in the US Space Shuttle Columbia disaster) is the first in the series of exclusive meteorological satellites built by ISRO.
Mission
Meteorological
Spacecraft Mass
1060 Kg mass (at Lift – off)
498 Kg (Dry mass)
Onboard Power
550 W
Payload
Very High Resolution Radiometer (VHRR)
Data Relay Transponder (DRT)
