ISRO General News and Updates

Neeraj Mathur

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The GSLV Saga

Geosynchronous Satellite Launch Vehicle (GSLV) is designed to launch 2.0 ton class of satellites into Geosynchronous Transfer Orbit (GTO). The three stage GSLV adopts the flight-proven solid and liquid stages of ISRO’s Polar Satellite Launch Vehicle (PSLV) and a cryogenic upper stage. The first stage comprises a solid propellant core motor and four liquid propellant strap-ons. The second stage is powered by a single liquid propellant engine. The third stage is a Cryogenic Stage with 12 tons of propellant loading. The launch vehicle stands 49 meters tall and weighs 416 tons at lift-off with a core diameter of 2.8 meters.

The GSLV has basically evolved from the rugged flight-proven PSLV. The solid propellant core motor of GSLV, called S139, is derived from the PS1 core stage of PSLV. Four liquid-fueled strap-ons, called L40, are clustered around the core stage. The second stage of the GSLV, designated as GS2, and the four L40 stages, use earth-storable liquid propellants and are derivatives of the PSLV’s second stage. The third stage of GSLV is the cryogenic stage, which uses liquid Hydrogen as fuel and liquid Oxygen as oxidiser. Liquid Oxygen is stored at -183 ⁰C while liquid Hydrogen is stored at -253 ⁰C in two separate tanks.

The major subsystems of cryogenic engine are the combustion chamber, gas generator, turbo pump, start up system, etc. In spite of the complexity and challenges, these fluids are preferred due to their ability to produce maximum thrust for every kilogram of propellant and the cryogenic engines are the most efficient engines in use for launch vehicles. Since ISRO did not have the Cryogenic technology, the initial launches of GSLV were flown with procured Russian Cryo Stage. At the same time, efforts were on to develop our own Cryo engine and Stage.

The current version of GSLV has a payload Fairing of 3.4 metre diameter made of Aluminum Alloy. This Fairing houses the satellite during the launch phase through the atmospheric regime.

The vehicle is equipped with an Inertial Navigation and Guidance System for computing the inertial position and guiding the vehicle from lift-off to satellite injection. The Digital Auto Pilot and the Closed Loop Guidance scheme ensure the required attitude (orientation) maneuvers and guided injection of the satellite.

GSLV had its maiden launch on April 18, 2001. Subsequently, there were three more successful launches with GSLV-D2, GSLV-F01 and GSLV-F04. EDUSAT, India's first satellite dedicated for education was launched in GSLV-F01 mission. All these missions were conducted with Russian Cryo Stage.

The first indigenously developed Cryo Stage launched in GSLV-D3 could not accomplish the mission due to its turbo pump failure. After a thorough understanding of the problem and implementing the required changes, exhaustive tests including High Altitude Test of the engine were conducted. Following this, GSLV-D5 was successfully launched on January 5, 2014, with the indigenously developed cryogenic stage which placed the 1982 kg GSAT-14 satellite in to a precise Geosynchronous Transfer Orbit. The consistency in the performance of the vehicle, especially the Cryo Stage, was established with the recent spectacular success of GSLV-D6 carrying GSAT-6 satellite on August 27, 2015. All the future launches of GSLV will be with the indigenous cryogenic stage.

With two back-to-back successful missions carrying indigenous cryogenic stage, GSLV has matured into a reliable launch vehicle and has paved the way for its future operational missions, providing India self-sufficiency in launching higher capacity satellites into GTO. The next mission, designated as GSLV-F05, is targeted for launch in July 2016 and will carry the 2200 kg INSAT-3DR meteorological satellite. GSLV-F09 is planned in May 2017 to launch the GSAT-9 satellite. The prestigious Chandrayaan-2 Mission is designated to be launched by GSLV in 2017-18 time frame.

GSLV is well on its way towards international and commercial operations. Work is already in progress on the joint effort with NASA for the launch of NISAR satellite into a Polar orbit by 2020-21. This mission will demonstrate the versatility of the GSLV for launch into various orbits. Enquiries are also coming in for commercial launches from various countries.

While technical criticalities of the complex GSLV system have been overcome, challenges are being taken up for improving the payload capability from the present 2117 kg to the design target of 2500 kg. Detailed studies are in progress, addressing the various ways of achieving this target.



GSLV-D1 (launched on April 18, 2001) - being moved to Launch Pad


GSLV-D6 (launched on August 27, 2015) - being moved to Launch Pad

http://www.isro.gov.in/gslv-saga
 

charlie

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How do the military then gather intelligence on nuclear assets, terrorist camps, border posts and formations on other side of border(apart from human intel)? Just asking if you know.. I don't remember hearing any country boosting about military applications on launched satellites. So thought it may have military angle to it.
Ohh i was telling you about what neeraj wrote camera to see satellite
Not for recon.
 

charlie

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not military, like nasa puts camera on their rockets and shows the views when rockets leave earth's atmosphire

@charlie

camera on satellite to see this
Thanks Neeraj, I worked for that company who made those space reflectors (not the same department)
 

cannonfodder

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:india::india:
http://idrw.org/gsat-6-indias-second-military-satellite-launched/
Owing to topographical challenges, soldiers on many occasions encounter breaks in commutations. GSAT-6 is expected to provide quality and secure communication. This new system also frees the soldier from carrying bulky communication equipment since very small handheld devices would be put in use.

The launch of the military satellite GSAT-6 needs to be analysed in the backdrop of India’s overall military space capabilities. India has announced that the GSAT-7 and GSAT-6 satellites have been developed for strategic purposes. Earlier, some remote-sensing (sub-metre resolution, matching with the best in the world) satellites were also launched by ISRO as dual-purpose satellites like the technology experimental satellite (TES, 2000) and the four cartographic satellites (CARTOSAT-1, 2, 2A and 2B in 2005, 2007, 2008, 2010). India has also launched (with Israeli assistance) two Synthetic Aperture Radar (SAR) satellites called RISAT II (2009) and RISAT I (2011) essentially to address terrorism related threats.
 

salute

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it is the third stage (cryogenic stage) it will be covered when it reaches launch pad
yeah just found thats its cryo engine,but whats the the wrapping its like amateur,
or is it some cheap cost jugaad tech,

isro have something to cover entire rocket into one shell ??? excluding boosters.
 

Neeraj Mathur

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yeah just found thats its cryo engine,but whats the the wrapping its like amateur,
or is it some cheap cost jugaad tech,

isro have something to cover entire rocket into one shell ??? excluding boosters.
doesn't matter if its ugly or not , It should work and it worked

i am proud of ISRO
 

Neeraj Mathur

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Video from the onboard cameras of GSLV-D6

http://www.isro.gov.in/sites/default/files/videos/My Movie.mp4.mp4

Two onboard cameras were placed on the launcher - one at the second stage (GS2) looking down towards first stage (GS1) and the second on top of GS2 to look at the nozzle of the cryo stage. The initial segment of the video shows the nozzle portion of the GS2 looking down towards the top dome of the GS1 stage. The vented interstage skirt is also visible. The GS2 stage ignition followed by the GS1 separation (S139 along with four strap-ons) is clearly seen. Three strap-ons separating along with S139 and the interstage separation can also be seen. Afterwards, the screen is blank to switch between the cameras. The later portion of the video shows the magnificent ignition of the indigenous cryogenic stage.'



i was asking for this
thanx isro
 

cobra commando

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India to launch multi-spectral remote sensing Indonesian satellite

India will launch a second multi-spectral remote sensing Indonesian satellite that will help the country to monitor land-use, natural resource and in disaster mitigation. The indigenously-made LAPAN A2/Orari satellite is a successor to LAPAN A1/Tubsat, which was also launched in India in 2007. "Today, I'm officially sending off the LAPAN A2/Orari satellite," President Joko "Jokowi" Widodo was quoted as saying by The Jakarta Post during the launching ceremony today. The satellite will be shipped to India tomorrow to be launched at the Satish Dhawan Space Center in Sriharikota. LAPAN A2/Orari will function as a tool to monitor land usage, ship movements, sea resources and fishing explorations. It is also equipped with an automatic packet reporting system on board to aid disaster mitigation by monitoring floods, changes in the sea level as well as movements of the population. The satellite will orbit the Earth along the equator with an altitude of 650 kilometers, and travel at 7.5 kilometers per second - enabling it to circle the Earth 14 times a day.

India to launch multi-spectral remote sensing Indonesian satellite
 
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Neeraj Mathur

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India to launch multi-spectral remote sensing Indonesian satellite

India will launch a second multi-spectral remote sensing Indonesian satellite that will help the country to monitor land-use, natural resource and in disaster mitigation. The indigenously-made LAPAN A2/Orari satellite is a successor to LAPAN A1/Tubsat, which was also launched in India in 2007. "Today, I'm officially sending off the LAPAN A2/Orari satellite," President Joko "Jokowi" Widodo was quoted as saying by The Jakarta Post during the launching ceremony today. The satellite will be shipped to India tomorrow to be launched at the Satish Dhawan Space Center in Sriharikota. LAPAN A2/Orari will function as a tool to monitor land usage, ship movements, sea resources and fishing explorations. It is also equipped with an automatic packet reporting system on board to aid disaster mitigation by monitoring floods, changes in the sea level as well as movements of the population. The satellite will orbit the Earth along the equator with an altitude of 650 kilometers, and travel at 7.5 kilometers per second - enabling it to circle the Earth 14 times a day.

India to launch multi-spectral remote sensing Indonesian satellite
i think this will go with Astrosat through PSLV
 

Neeraj Mathur

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Indonesia to launch satellite from India



Indonesia is set to launch a locally made satellite from India on September 27, a media report said on Thursday.
The LAPAN A2/Orari satellite was produced entirely in Indonesia by the National Institute of Aeronautics and Space (LAPAN) in 2012. It is a successor to LAPAN A1/Tubsat, which was launched in India in 2007, The Jakarta Post reported.”Today, I’m officially sending off the LAPAN A2/Orari satellite,” said President Joko Widodo during the launch ceremony on Thursday.


The satellite will be shipped to India on Friday. It will be launched at the Satish Dhawan Space Centre in Sriharikota, Andhra Pradesh.

LAPAN A2/Orari will function as a tool to monitor land usage, ship movements, sea resources and fishing explorations.

It is also equipped with an automatic packet reporting system on board to aid disaster mitigation by monitoring floods, changes in the sea level as well as movements of the population.

The satellite will orbit the earth along the equator with an altitude of 650 km and will travel at 7.5 km per second – enabling it to circle 14 times a day.


http://idrw.org/indonesia-to-launch-satellite-from-india/
 

Chinmoy

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me never said its ugly,its amateur,lack of funding probably.
Well its a foil cover against elements. As far as its composition is concerned, its made up mainly of Aluminum and Gold composite. Now if you would like to say it as lack of funding, then............
 

Neeraj Mathur

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GSAT-6 update :GSAT 6 has been successfully positioned in its orbital slot

GSAT 6 has been successfully positioned in its orbital slot of 83 Deg E and colocated with INSAT 4A, GSAT 12, GAAT 10 and IRNSS1C today (Sept. 06 2015) morning, after carrying out four drift arresting manoeuvers

 

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