Dismiss Notice
Welcome to IDF- Indian Defence Forum , register for free to join this friendly community of defence enthusiastic from around the world. Make your opinion heard and appreciated.

ISRO News & Discussions

Discussion in 'Education & Research' started by Varad, Apr 17, 2011.

  1. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

    Joined:
    Sep 22, 2016
    Messages:
    663
    Likes Received:
    1,252
    Country Flag:
    India
    Story of the Week - Indian Space Research Organization
    ISRO Joins 36th Indian Scientific Expedition to Antarctica

    Following are the research activities in the area of climate change studies and Atmospheric studies:

    [​IMG]
    SCATSAT-1 2.25 km Data Derived Sea Ice cover over the Antarctica

    [​IMG]
    The Data analysis shows the reduction of the sea ice in the India Bay region (information used as a part of sea ice advisory)

    [​IMG]Snow Fork Observations in Pit

    Story of the Week - Archive
    Mar 21, 2017 : ISRO Joins 36th Indian Scientific Expedition to Antarctica
    Mar 13, 2017 : CME Programme of DECU- A Social Research Perspective
    Mar 06, 2017 : NARL Celebrates Silver Jubilee of Establishment of MST Radar
    Feb 27, 2017 : 50th High Performance Motor Case (HPS3) for Third Stage of PSLV Realised
    Feb 20, 2017 : The Unique Triumph of PSLV-C37
    Feb 13, 2017 : Space Technology Inputs to Operationalise Flood Early Warning System (FLEWS) in Assam
    Feb 06, 2017 : Indigenous development of Telemetry & Telecommand Processor (TTCP)
     
    SR-91 and Nilgiri like this.
  2. layman

    layman Aurignacian STAR MEMBER

    Joined:
    May 1, 2012
    Messages:
    11,024
    Likes Received:
    3,042
    Country Flag:
    United States
    Risat-1 satellite is functioning normally, says Isro
    Published March 28, 2017
    SOURCE: DECCAN CHRONICLE

    [​IMG]

    The US space agency Nasa has reported that India’s earth observation satellite Risat-1 had experienced a “fragmentation event” in September last year, when pieces appeared to have broken off. The report, in Nasa’s quarterly magazine Orbital Debris, said the cause was not known. An Isro official said there was some anomaly which had been rectified, and the satellite was functioning normally.

    Risat-1 (Radar Imaging Satellite) was launched on April 26, 2012, on board a PSLV rocket. It had been in space for 4.4 years when the incident reported by Nasa occurred. The magazine said Risat-1 experienced the fragmentation event between 0200 and 0600 GMT (7.30 am and 11.30 am IST). Over 12 fragments were observed by the Space Surveillance Network of the US, it said. By November 8, only one piece, designated SSN 41797, had entered the catalog, having decayed — from orbit on October 12, 2016. The other pieces had decayed — moved away from the satellite — as well. Eventually, space debris in the near earth orbit tends to enter the earth’s atmosphere and burn up.

    The magazine said the event was categorised as an “anomalous separation of multiple high area-to-mass ratio debris”. Events like this are sometimes referred to as a shedding event. Nasa’s Space Debris Programme continuously tracks 17,000 space objects and maintains record of all space debris — non-functional objects in space — as well as operational satellites.

    When contacted for clarification, Isro spokesperson Deviprasad Karnik said the satellite was functioning normally. He said Isro scientists had corrected some anomaly which had nothing to do with what was reported in the Nasa magazine. Operating in the microwave frequency, Risat-1 carries a first of its kind synthetic aperture payload. The camera which enables imaging of the surface features during both the day and night under all weather conditions. The satellite can be used for management of natural disasters like flood and cyclones, monitoring crop especially paddy in the Kharif season, generic vegetation, forestry, soil moisture, geology, and sea ice.

    Source
     
    Ripcord322 likes this.
  3. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

    Joined:
    Sep 22, 2016
    Messages:
    663
    Likes Received:
    1,252
    Country Flag:
    India
    Story of the Week - Indian Space Research Organization
    Observation of Suprathermal Argon in Mars Exosphere


    [​IMG]

    The above result has been published recently in the American Geophysical Union (AGU) journal Geophysical Research Letters vol. 44, 2017. doi:10.1002/2016GL072001.
    [​IMG]
    Story of the Week - Archive
    Mar 27, 2017 : Observation of Suprathermal Argon in Mars Exosphere
    Mar 21, 2017 : ISRO Joins 36th Indian Scientific Expedition to Antarctica
    Mar 13, 2017 : CME Programme of DECU- A Social Research Perspective
    Mar 06, 2017 : NARL Celebrates Silver Jubilee of Establishment of MST Radar
    Feb 27, 2017 : 50th High Performance Motor Case (HPS3) for Third Stage of PSLV Realised
    Feb 20, 2017 : The Unique Triumph of PSLV-C37
    Feb 13, 2017 : Space Technology Inputs to Operationalise Flood Early Warning System (FLEWS) in Assam
     
  4. GSLV Mk III

    GSLV Mk III Captain FULL MEMBER

    Joined:
    Dec 1, 2016
    Messages:
    1,371
    Likes Received:
    1,895
    Country Flag:
    India
    ISRO embraces private sector to outsource satellite manufacture

    BENGALURU: APRIL 02, 2017 13:29 IST

    11-3.jpg

    For making a full multi-crore, heavy duty satellite — unable to keep pace with the bird’s fabrication.

    In a highly secure, clean room of the Indian Space Research Organisation (ISRO) here, teams from the private sector are working shoulder-to-shoulder with government engineers to create a new bird that will soar in the sky very soon.

    The Indian space establishment has crossed a new threshold, engaging for the first time a private sector industry to make a full multi-crore, heavy duty and full navigation satellite. Having been unable to keep pace with satellite fabrication, the ISRO has now roped in the private industry to bridge the gap.

    Two for the Navy
    A consortium led by Alpha Design Technologies, Bengaluru is tasked to make two full satellites for India’s navigation system.

    After almost 150 missions and three decades of space faring, the ISRO is on a mission like never before.

    Towards that end, a high-tech defence equipment supplier from Bengaluru, Alpha Design Technologies has been chosen as the first private industry tasked with making not one but two full satellites for the ISRO.

    A team of 70 engineers is working hard to make a flight-ready satellite in the next six months. Colonel H.S. Shankar, the man who helped India get its first bulk supply of electronic voting machines (EVMs), is leading the consortium and he is keeping a hawk’s eye on the fabrication process.

    Challenging task
    Col. Shankar, Chairman-cum-Managing Director of Alpha Design Technologies, says, “It is a challenging task for any Indian company to undertake assembly, integration and testing of a satellite and that too for the first time in India.”

    With seven satellites already in orbit, the NAVIC (Navigation with Indian Constellation) or the Swadeshi GPS system is today fully functional but to be on the safe side the ISRO needed two spare satellites on the ground for a quick launch in case something went wrong.


    It signed up with the Rs. 400-crore company to give India its first large private satellite.

    The ISRO also wants to seed an ecosystem where the private sector takes a lead in the future.

    Quantum jump: Annadurai

    M. Annadurai, Director of ISRO Satellite Centre in Bengaluru, said, “Basically there is a gap between what we are capable of doing now versus what we are supposed to make. There is a gap between the requirement and our capability. That gap we want to fill up with support from the industry.”

    “...16 to 17 satellites we have to make every year. So it is a really-really quantum jump and to fill that gap..., we thought the industry could come in,” he added.

    Satellite fabrication requires high precision as these birds cost hundreds of crores of rupees and after the launch they remain functional for up to 10 years with no scope for repair.

    It’s tough up there
    The space environment is very punishing and the untested fail miserably and space faring remains a high risk activity.

    Mr. Annadurai thinks the ISRO is not taking any risk by relying on the private sector, adding, “I do not think it is a risk. It is basically an incremental improvement over what we have already done. When you look at NAVIC satellite system, except for the first satellite, on all the other remaining satellites more than 95 per cent of the systems that were flown basically came from industry.”

    “Similar thing is being done for this mission. For the first standby Indian Regional Navigation Satellite System (IRNSS) satellite, we will be handholding the private team. Some 70 young engineers are there and they will be watching what we are doing and then at the end of the first satellite fabrication, the private team will come out with a document of what they have understood and how they will make the second satellite, this document will be audited by the ISRO’s quality assurance team,” he said.

    And once the ISRO teams clears it and are convinced that the private team is really trained and they are equipped with the necessary skill sets, only then will they do the second satellite fabrication on their own.

    More birds to soar soon
    “Hopefully, together we will be able to succeed because anyhow they are learning under our watch. So once they start to do one or two satellites like that, they will be able to take on making subsequent satellites totally on their own,” he said.

    India recently launched 104 satellites on a single mission, creating such a global sensation that an intelligence officer from the U.S. expressed his “shock” at India’s singular achievement and this paved the way for India’s foray into the multi-billion dollar launch industry.

    By supporting the private industry to learn the processes of making satellites, India hopes to create a robust space industry in the private sector. In the past, the ISRO has designed and made a satellite for the Europeans and this new and bold move could in times pave the way for India being a global hub for the space sector.

    Towards that end, a high-tech space park is almost ready at one of ISRO’s newer satellite facilities in Bengaluru, and here the private sector could make the best of the best satellites.

    Mr. Annadurai has said once ready, this space park will be unique since from the smallest components to the flight-ready satellites — all will be made under one roof.No other facility like this exists anywhere in the world, he insists.

    Reliable space power

    India is regarded as a low cost and reliable space power. Today for the first time a satellite is being fabricated in the private industry — a giant leap for the ISRO and a giant leap for the Indian space industry.

    So in the corner of an airtight room of India’s satellite fabrication unit where even the smallest speck of dust is not allowed to enter, a giant breathe of ‘private’ fresh air has been ushered in.

     
    Pundrick and Nilgiri like this.
  5. Ripcord322

    Ripcord322 Lieutenant FULL MEMBER

    Joined:
    Nov 30, 2016
    Messages:
    602
    Likes Received:
    552
    Country Flag:
    India
    We have come a long way...But still have a long way to go...

    Our Immediate priorities should be cutting our reliance on European Launchers...By finishing GSLV Mk3 and it's upgraded brother with the SC Engine....And further enhancing our commercial launch ability....I feel like any governmental organisation...Their Prime Aim should be revenue generation.

    Beyond that I feel the GoI will be very Interested in something like Mineral Extraction from outer space... Which is well a looooooooong shot....But it's the only one with the opportunity of extravagent revenue generation....

    The MoD will definitely be interested in Military Com/Recon/Navigation satellites....We do have some capacity...but a lot is left desired...This area definitely needs a special push...

    And then for further revenue generation...The good old business of leasing transponders is there too...There is a shortfall currently....

    And lastly but also importantly.... Weather and Cartography Satellites....They server the People and also save a lot of lives and yeah...A lot of Money.

    And how can we forget...Missions like MoM and Chandrayaan are good for Research but Very good for PR...This solidifies your place as a 'launch service provider who knows his shi#'.....That will further attracts more revenue from new customers.... Besides making people and the scientists happy and proud....Double Whammy....


    And also...If enough revenue is generated...The Scientists at ISRO might as well be self sufficient enough to...Make their own space observatories....And space telescopes....And what not....No need for government sanctioned funds...
     
    Last edited: Apr 2, 2017
    GSLV Mk III likes this.
  6. Soumya

    Soumya Major STAR MEMBER

    Joined:
    Jun 10, 2013
    Messages:
    3,438
    Likes Received:
    1,814
  7. GSLV Mk III

    GSLV Mk III Captain FULL MEMBER

    Joined:
    Dec 1, 2016
    Messages:
    1,371
    Likes Received:
    1,895
    Country Flag:
    India




    ^^You might find this interesting
     
    Nilgiri and Ripcord322 like this.
  8. sangos

    sangos Lt. Colonel ELITE MEMBER

    Joined:
    Apr 25, 2013
    Messages:
    5,137
    Likes Received:
    2,735
    Country Flag:
    India
    Not primarily. The goal of ISRO should be to take the initial risks and put in the money. So that the private industry can followup with a calculated risk model to invest its resources.
     
  9. kurup

    kurup 2nd Lieutant IDF NewBie

    Joined:
    Dec 29, 2010
    Messages:
    300
    Likes Received:
    418
    Anything significant in the video ??
     
  10. GSLV Mk III

    GSLV Mk III Captain FULL MEMBER

    Joined:
    Dec 1, 2016
    Messages:
    1,371
    Likes Received:
    1,895
    Country Flag:
    India
    I 4/6K bus, Ka band High throughput satellites, higher generated power (15/20 kW), bus standardization & realization through industries- basically nothing for us Mechanical folks :p

    Have you seen LPSC Director S Somanath's presentation? The one with HLV with clustered engines ?
     
  11. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

    Joined:
    Sep 22, 2016
    Messages:
    663
    Likes Received:
    1,252
    Country Flag:
    India
    Story of the Week - Indian Space Research Organization
    ISRO signs Three MoUs with Government of Andhra Pradesh for use of Geo-spatial Technology




    [​IMG]Director, SDSC SHAR /ISRO and Special Chief Secretary to Government (FAC) (Marketing), Govt. of Andhra Pradesh exchanging MoU in the presence of Hon’ble Chief Minister of Andhra Pradesh and Chairman, ISRO on March 15, 2017 at Vijayawada

    [​IMG]Andhra Pradesh Varuna

    [​IMG]Deputy Director, RSAA, NRSC/ISRO and Commissioner, Disaster Management, Govt. of Andhra Pradesh exchanging MoU in the presence of Hon’ble Chief Minister of Andhra Pradesh and Chairman, ISRO on March 15, 2017 at Vijayawada

    [​IMG]Deputy Director, RSAA, NRSC/ISRO and Secretary, Water Resources Department, Govt. of Andhra Pradesh exchanging MoU in the presence of Hon’ble Chief Minister of Andhra Pradesh and Chairman, ISRO on March 15, 2017 at Vijayawada
    Story of the Week - Archive
    Apr 03, 2017 : ISRO signs Three MoUs with Government of Andhra Pradesh for use of Geo-spatial Technology
    Mar 27, 2017 : Observation of Suprathermal Argon in Mars Exosphere
    Mar 21, 2017 : ISRO Joins 36th Indian Scientific Expedition to Antarctica
    Mar 13, 2017 : CME Programme of DECU- A Social Research Perspective
    Mar 06, 2017 : NARL Celebrates Silver Jubilee of Establishment of MST Radar
    Feb 27, 2017 : 50th High Performance Motor Case (HPS3) for Third Stage of PSLV Realised
    Feb 20, 2017 : The Unique Triumph of PSLV-C37
     
    Wolfpack and layman like this.
  12. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

    Joined:
    Sep 22, 2016
    Messages:
    663
    Likes Received:
    1,252
    Country Flag:
    India
    ISRO Organises Smart India Hackathon-2017 Grand Finale
    IMG_20170414_102103_900.JPG

    [​IMG]
    36-hours Hackathon underway at Gujarat University Convention Hall, Ahmedabad

    [​IMG]
    Valedictory Function and Prize Distribution on April 02, 2017
    Story of the Week - Archive
    Apr 10, 2017 : ISRO Organises Smart India Hackathon-2017 Grand Finale
    Apr 03, 2017 : ISRO signs Three MoUs with Government of Andhra Pradesh for use of Geo-spatial Technology
    Mar 27, 2017 : Observation of Suprathermal Argon in Mars Exosphere
    Mar 21, 2017 : ISRO Joins 36th Indian Scientific Expedition to Antarctica
    Mar 13, 2017 : CME Programme of DECU- A Social Research Perspective
    Mar 06, 2017 : NARL Celebrates Silver Jubilee of Establishment of MST Radar
    Feb 27, 2017 : 50th High Performance Motor Case (HPS3) for Third Stage of PSLV Realised
     
    Wolfpack, dray, Nilgiri and 1 other person like this.
  13. PARIKRAMA

    PARIKRAMA Captain IDF NewBie

    Joined:
    Mar 24, 2016
    Messages:
    1,562
    Likes Received:
    7,575
    Country Flag:
    India
    Credit to @Soumya

    Satish Dhawan Wind Tunnel Complex Commissioned at VSSC

    In the quest to reduce the cost of access to space and to extend the frontiers of space exploration, ISRO has ventured into Reusable Launch Vehicle (RLV) and Re-entry missions, Air-breathing propulsion technology demonstration and Interplanetary missions. These missions encounter design criticalities at Hypersonic Mach number regime and need rigorous aero-thermodynamic characterisation at these Mach numbers. In order to cater to the above need, Industrial type Hypersonic Wind Tunnel and Shock Tunnel have been established at Vikram Sarabhai Space Centre (VSSC).

    The first phase of the facility, commissioned in 2012, with Mach 6 system and Shock Tunnel, has been extensively utilised and tests are being carried out for the current programs of ISRO.

    The second phase of Hypersonic Wind tunnel consists of the realisation of Mach 8, 10 and 12 nozzles, Heater-II system, Hot Shut-off Valves, Cooling system and associated subsystems. Realisation of these systems involved intricate design and analysis, high precision machining, heavy engineering hardware realisation, fabrication of high temperature performance materials, high temperature and high pressure valves realisation, development of state of the art Cored Bricks as heat storage media, realisation of massive 15-5 PH forgings and high temperature heating modules. Integration of these systems was carried out meticulously, performance assessment was made and trial runs were conducted to calibrate and validate the tunnel systems.

    With capability up to Mach 12 operation, Hypersonic Wind Tunnel is the third largest in the world in terms of hypersonic flow simulation capability over a wide spectrum. The tunnel has the capability to simulate flow field conditions at Mach 6, 8, 10 and 12 of nominal nozzle exit diameter of 1 metre with Reynolds number ranging from 1 to 80 million per metre. The tunnel is pressure-vacuum driven with high pressure storage system of 300 bar and vacuum system of 10-2 mbar capacity. Regenerative storage heater system is used to preheat the compressed air up to 1550 K before it is expanded through the nozzle to Hypersonic Mach number. The state-of-the-art technology is used for data acquisition and control of the tunnel system. Programmable Logic Controller (PLC) based system works on Dual redundant Hot Standby concept and monitors more than 100 input parameters and controls more than 60 events. The shock tunnel uses combustion driver and has the capability to simulate free stream velocities up to 4.5 km/s and a maximum Reynolds number of 3.3 million per metre.

    The realisation of the above facilities paved the way for the indigenous development of technologies, in the area of Cored Bricks, Hot Shut off Valves and massive 15-5 PH forgings. Hot Shut-off Valves, the most critical valve in the tunnel circuit with simultaneous application of high pressure and high temperature of 110 bar and 1550 K respectively, have been indigenously developed. High temperature Heater system demanded high purity Alumina Cored Bricks, of low dust characteristics and high temperature thermal shock resistance, as heat storage media. These were jointly developed by ISRO and Indian industries. Massive 15-5 PH forgings with integral flanges are realised for the high pressure shock tubes designed to withstand 1000 bar and associated fatigue cycles.

    The major systems of the tunnel are designed to meet the requirement of five blow downs per day. It consists of 500 valves, 2 km pipelines, 40 numbers of electric motors and 35 fluid pumps. These facilities have been indigenously designed, developed and made with the support of Indian Industries.

    This Integrated Hypersonic Wind Tunnels facility has been commissioned by Chairman, ISRO / Secretary, DOS, recently during March 2017. The entire complex, consisting one metre Hypersonic Wind Tunnel, one metre Shock Tunnel and Plasma Tunnel was named as “Satish Dhawan Wind Tunnel Complex” as a tribute to Prof. Satish Dhawan, who has made very significant contributions in the field of wind tunnels and aerodynamics.

    [​IMG]

    1 m Hypersonic Wind Tunnel at VSSC



    [​IMG]

    Commissioning of Integrated Hypersonic Wind Tunnels at Satish Dhawan Wind Tunnel Complex, VSSC
    http://www.isro.gov.in/satish-dhawan-wind-tunnel-complex-commissioned-vssc
     
  14. Nilgiri

    Nilgiri Lieutenant IDF NewBie

    Joined:
    Oct 16, 2016
    Messages:
    634
    Likes Received:
    1,601
    Country Flag:
    India
    Copying and pasting from another forum...my Q&A for this facility (in context of the rocket sled facility also created):

    Q: I don't understand this test. What are they trying to do with a rocket on a rail?

    A: Its to have a reliable way of creating the high velocities needed for technology validation (such as scramjet inlet compression).

    Here is an old school paper on it:

    http://www.dtic.mil/dtic/tr/fulltext/u2/718664.pdf


    Q: Can you explain to me in detail what they are trying to do?

    To me I can't fathom that railway tracks will create anywhere near the said high velocities.

    A: Railway track is a way to enforce a controlled (linear) test.

    The rockets give the short high impulse burn to achieve the mach 5+ speeds of interest.

    At the speed of interest, fairings are separated and data collected from the instrumentation behind say the inlet geometry being tested.

    You can also do impact tests, ejection tests etc etc anything where you need final step validation after the iterative steps using a wind tunnel/CAD.

    The Holloman rocket sled track is probably one of the most well known.


    Q: But can't you use to wind tunnels? They may even be able to produce sustained high speeds.

    I still have hard time believing that you can achieve Mach 5 on a rail track.

    And what about simulation? CFD simulations are getting better all the time.



    A: Each level of the process has its niche role. That's why i mentioned wind tunnel and CAD (CFD as you correctly mention in this case) in my previous reply.

    CFD simulations will definitely have the bulk of the design RnD esp for the initial iterations.

    Then the validation of that eventually will require a wind tunnel (ideally)...and hence why you have that as part of the program too. The results of the wind tunnel (at sustained speed of interest) would then provide any correction factors + coefficients back to the CFD...and that is a cycle you go back and forth as needed.

    For subsonic and transonic designs you can pretty much end here....but for supersonic and especially hypersonic designs, you do need to preferably further validate once more (before the final complete system test).

    This is because of the nature of supersonic and hypersonic regime regarding acceleration through it. It is highly non-linear (with non-linear cascading which makes things even harder to model in CFD and wind tunnel) depending on the geometries in question. This is part of the reason why scramjet technology is nowhere near proven today.

    That's where rocket sleds come in, they can not only create the speed of interest (in this case mach > 5), they can also accelerate/decelerate through that regime with much better resolution than a hypersonic wind tunnel.

    With a wind tunnel, you essentially have a large enough, powerful enough fan and various tube/tunnel geometries at your disposal to create the testing conditions. It is impossible to create the accelerations to induce the non-linear effects associated with supersonic and hypersonic regimes....because the energy is commited to moving a large (compressible) mass of air, and to get that air to accelerate at any great clip is not economically feasible with the technology and energy transfer intensity we currently have.

    Thus its much easier to accelerate the body (by way of rocket sled) for the final validation given its much lower mass.

    There are shock tunnels and tubes too (which are a bit different to all I have discussed here), but again they have trade - offs esp with their time of operation (to generate more sustained phenomenon).

    So in the end having a rocket sled is very valuable as it would save having to launch the system with a real rocket (or rocket mounted to aircraft etc) each time (and go through all that time and expense) to validate things that can be done on the ground much more cheaply and frequently (and leave as little margin of unknown for the final altitude system testing).

    ===============================================

    As an aside, I will not be continuing any more sustained technical conversations in that said forum anymore... (I do not suffer fools gladly...and mods power trip too much over that) unless its a specific request from a friend over there.

    I would like to bring more technical discussion to this forum in all areas I have some knowledge of. Please tag me where relevant or ask questions as needed etc. I literally have little idea of how to non-organically present information (without a full engineer/science based audience) the best way...... (I tend to do best in organic interaction with a generic but interested audience).

    I would appreciate if this thread can be used to develop that and any input from members here on any ideas regarding that.

    @Levina @Rain Man @GSLV Mk III @Joe Shearer @Hellfire @nair @Grevion @Abingdonboy @randomradio @Wolfpack @VCheng @vstol jockey @Gessler @Vergennes @Picdelamirand-oil @members @mods et al
     
  15. Hellfire

    Hellfire Devil's Advocate THINKER

    Joined:
    Apr 16, 2017
    Messages:
    2,085
    Likes Received:
    4,904
    Country Flag:
    India

    Yon want me to read more? :(

    I have plenty to read over a short span as it is :itching
     
    Grevion and Nilgiri like this.

Share This Page