Gsat 7 successfully launched

[Mudasir 4K]

India's first exclusive
defence satellite GSAT-7 was
successfully launched by European
space consortium Arianespace's
Ariane 5 rocket from Kourou
spaceport in French Guiana on Friday,
giving a major push to the country's
maritime security.
Indian Navy would be the user of the
multi-band home-built
communication spacecraft, expected
to be operational by September end.
The Rs 185-crore GSAT-7, the
country's maiden dedicated spacecraft
for defence applications, was
launched during a 50-minute launch
window which started at 2am, and it
was telecast live by Doordarshan.
After a flight of almost 34 minutes, the
satellite was injected into a
geosynchronous transfer orbit (GTO)
of 249 km perigee (nearest point to
earth), 35,929 km apogee (farthest
point to earth) and an inclination of
3.5 degree with respect to the
equator.
During August 31-September 4, three
orbit-raising operations will be
performed by Indian Space Research
Organisation (ISRO) to place the
satellite into geostationary orbit of
36,000 km above the equator.
By September 14, GSAT-7 is planned
to be positioned in its orbital slot of 74
deg East longitude and subsequently
the satellite's communication
transponders will be switched on.
The frequency bands of GSAT-7 will
help space-based marine
communications. It has coverage over
India landmass as well as surrounding
seas.
"It's important from security and
surveillance points of view", an ISRO
official said.
According to a senior space scientist,
so far the Navy had limitation from
line of sight and ionospheric effects,
among others, as far as space-based
communications were concerned.
It was thought essential to have an
integrated platform for the Navy's
exclusive use.
Earlier, satellite communication in
ships was through Inmarsat, a major
provider of global mobile satellite
communications services.
The state-of-the-art satellite carrying
payloads operating in UHF, S, C and
Ku bands, had a lift-off mass of 2625
kg and is based on ISRO's 2500 kg
satellite bus with some new
technological elements, including the
antennae.
According to ISRO, GSAT-7 is an
advanced communication satellite to
provide wide range of service
spectrum from low bit rate voice to
high bit rate data communication. Its
payload is designed to provide
communication capabilities to users
over a wide oceanic region including
the Indian land-mass.
The launch cost for ISRO is around Rs
470 crore, including insurance.
ISRO cannot launch heavy satellites
like GSAT-7 as its home-grown GSLV
rocket, with indigenous cryogenic
stage, is still at works and needs two
successful flights before it is declared
operational.
In addition to GSAT-7, the Ariane 5
orbited another spacecraft EUTELSAT
25B/Es'hail.
EUTELSAT 25B/Es'hail 1 - which rode
in the top position of the Ariane 5
payload "stack" - separated first, some
27 minutes after liftoff.
At approximately 34 minutes into the
flight, the lower passenger - GSAT-7 -
was deployed, completing the
mission.
Indian ambassador to France, Arun
Singh and director of Bangalore-based
ISRO Satellite Centre, S K Shivakumar,
were among those who witnessed the
launch.
Singh said the launch event is also a
reflection of strategic partnership
between India and France.
Shivakumar said GSAT-7 would be
operational by next month-end.

 

[Parkunan]

Good move by India

 

[Devesh]

Good news but it will take 10 years to become operational

4

 

[bvn]

Yes friend you say correct

 

[sk874]

so gsat 7 launch succesfully but when GSAT 14 is going to be launched any info about the lauch of GSAT14

 

[Mudasir 4K]

GSAT 14 DELAYED TILL DECEMBER


The Indian Space Research Organization (ISRO) today said that it was looking at launching its Geosynchronous Satellite Launch Vehicle (GSLV-D5), with communication satellite GSAT-14 on board, in December this year, about four months after the mission was called off on August 19 due to a technical glitch.
The launch was called off as a leak was observed in the UH25 fuel system of the liquid second stage during the pre-launch pressurisation phase on the vehicle, just two hours before the scheduled lift-off.
The GSLV-D5 mission is aimed at injecting the 1982 kg GSAT-14 into a geosynchronous transfer orbit (GTO).
It was to be the eighth flight of GSLV and its fourth developmental flight. The launch would also have marked the second flight test of the indigenously developed Cryogenic Upper Stage (CUS).
The first flight test of the indigenous CUS on GSLV-D3 had ended up as a failure on April 15, 2010 when it deviated from its path and splashed into the sea.
GSLV-D3 would have put the 2200 kg GSAT-4, an experimental advanced technology communication satellite that carried communication and navigation payloads, into GTO.
The cryogenic engine, developed after 20 years of work by scientists and engineers of the Indian Space Research Organisation (ISRO) on this complex technology, is crucial for putting communication satellites heavier than two tonnes into GTO.
An ISRO press release said that, at the time of calling off the GSLV-D5 countdown, the launch vehicle was loaded with 210 tons of liquid and cryogenic propellants. 
"About 750 kg of UH25 Fuel had leaked out, leading to contamination of the area around the launch pad. It took 6 days of round-the-clock operations before the contamination could be reduced to the safe level to enable movement of the GSLV-D5 back to the Vehicle Assembly Building. The GSLV-D5 Launch Vehicle has been safely moved back to the Vehicle Assembly Building on the early morning of August 26, 2013. The vehicle has been de-stacked," it said.
ISRO Chairman K Radhakrishnan constituted a High Level Task Team on August 20, chaired by Mr K. Narayana, (former Director of Satish Dhawan Space Centre) to identify the cause of the leak and to work out an action plan for quick restoration of the mission, taking into account the safety, reliability and life of the Liquid Second Stage and the four Liquid Strap-on stages, which were wetted with liquid propellants. 
"The leak is suspected to be in the lower portion of the propellant tank or the fluid lines between the tank and fuel filling system of the second stage. Detailed investigation of the leak is underway," it said.

 

[SARAVANA RAMESH]

congrats india

our next taget gsat 14`

 

[Prashant Shridhar]

Good work by isro.
Congrats.

 

[jenius-jatt]

Good work is only when they will work in the sky, Till our DTH companies are dependent on International satellites.Tata(sky is struggling from 2 years for Transponders.

 

[vijay mahanta]

Good work is only when they will work in the sky, Till our DTH companies are dependent on International satellites.Tata(sky is struggling from 2 years for Transponders.

This satellite is for naval purpose only. ok:lol