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Update: India to launch communication satellite GSAT-6A on March 29
#1
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In the field of space technology, India will close this fiscal with the launch of the GSAT-6A, a high power S-band communication satellite, on March 29, the Indian Space Research Organisation (ISRO) said on Friday.

According to the space agency, the satellite with a life span of around 10 years will be put into orbit by the Indian rocket, Geosynchronous Satellite Launch Vehicle (GSLV-F08).

The rocket is expected to blast off from the second launch pad at the Sriharikota rocket port in Andhra Pradesh at 4:56PM, on March 29.

The ISRO said that the GSAT-6A was similar to the GSAT-6.

The satellite will provide a platform for developing technologies such as demonstration of 6m S-Band Unfurlable Antenna, handheld ground terminals and network management techniques. These are useful in satellite-based mobile communication applications.

ISRO Chairman K.Sivan had earlier told IANS that the GSAT-6A would be followed by the launch of navigation satellite which will be in the next fiscal.

In the union budget for 2018-19, the Department of Space has been tasked with three earth observation space crafts ready for launch; four Polar Satellite Launch Vehicle (PSLV) flights; one each of Geosynchronous Satellite Launch Vehicle MkII and Mk III.

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#2
ISRO successfully places GSAT-6A satellite up in orbit


India on Thursday successfully launched the GSAT-6A satellite that would provide mobile communication facilities, using its heavy rocket Geosynchronous Satellite Launch Vehicle (GSLV-F08), in a copy book style.

The GSLV-MkII rocket slung the satellite in a geosynchronous transfer orbit (GTO) from where it would be taken up to its final geostationary orbit by three orbit raising manoeuvres.

ISRO’s scientists at the mission control centre were visibly happy, slapping each others’ backs and hugging each other once the rocket ejected the satellite into the intended orbit.

Indian Space Research Organisation (ISRO) Chairman K. Sivan said: “This is the sixth successful launch of GSLV with indigenous cryogenic engine. The GSAT-6A satellite was placed in its designated orbit precisely.”

“The GSAT-6A will complement GSAT-6 launched earlier. The two satellites will provide platform for advanced technologies for point-to-point communication.”

He said the GSLV rocket had major improvements to enhance its performance.

The induction of high-thrust Vikas engine enhances the performance capacity of the second stage by around six per cent.

Sivan said the rocket has been fitted with electromechanical actuation system in the place of electro-hydraulic actuation system, adding that the electromechanical actuation system was made with ISRO developed space grade lithium-ion (Li-Ion) cells.

Precisely at 4.56 p.m., the GSLV rocket ascended into the sky from the second launch pad here at Satish Dhawan Space Centre and the 49.1 metre tall rocket, weighing 415.6 tonne, slung the two tonne satellite into the intended orbit 17.46 minutes into its flight.

The purpose of the satellite is to provide mobile communication applications in S-band in five spot beams and C-band in one beam during its 10-year life span.

ISRO said that the GSAT-6A was similar to the GSAT-6 put into orbit in 2015.

The GSLV is a three stage/engine rocket. The core of first stage is fired with solid fuel while the four strap-on motors by liquid fuel. The second stage is the liquid fuel-propelled and the third is the cryogenic engine.

According to ISRO, two improvements — induction of Vikas engine and electromechanical actuation system — have been made in the rocket’s second stage this time around.

One of the crucial rocket engines is the cryogenic engine, designed and developed by ISRO, and more efficient than the other two variants as it provides more thrust for every kilogram of propellant burnt.

With this successful launch, India established the performance of its GSLV-MkII rocket which in future may fetch orders from third parties for launching their satellites.

India puts into orbit foreign satellites for a fee using its lighter rocket – the Polar Satellite Launch Vehicle (PSLV) as their weight is not much.

Revenue for launching satellites depends on weight of the satellite – higher the weight, higher will be the revenue.

According to the latest Economic Survey, foreign exchange earnings of India from export of satellite launch services increased noticeably in 2015-16 and 2016-17 to Rs 394 crore and Rs 275 crore from Rs 149 crore in 2014-15.

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#3
ISRO loses contact with GSAT-6A communication satellite

In a setback for its space programme, India on Sunday said it lost contact with its communication satellite GSAT-6A, which was launched on board the Geosynchronous Satellite Launch Vehicle (GSLV) on March 29.

“After the successful long-duration firings, the communication from the satellite was lost when it (satellite) was on course for the final firing (to place the satellite in its final geostationary orbit), scheduled for April 1 (Sunday),” the state-run Indian Space Research Organisation (ISRO) said in a statement.

The satellite was to be placed in its intended orbit after manoeuvres from the space agency’s Master Control Facility (MCF) at Hassan in Karnataka, about 180 km from Bengaluru.

“Efforts are underway to establish the link with the satellite,” said the statement.

After a copybook launch, the GSLV-MkII had deployed the satellite in a geosynchronous transfer orbit on March 29 after which it had to be placed in its final geostationary orbit through three orbit raising manoeuvres.

Only after the communication link is re-established with the satellite can it be placed in its intended orbit.

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