ISRO General News and Updates

[indiatester]

The same problem with the atomic clocks as reported in the Galileo navigation system as well, not surprising since they were sourced from the same company. In their case 9 of their clocks have developed snags, but then they have 18 satellites up there.

It should be noted that these are IRNSS-1A clocks that have developed snags. This was the first of the IRNSS satellites to be launched in 2013, the clocks failed after three and a half years.

It's unclear if the clocks for the subsequent satellites were ordered all at once or in batches. If it's only the first lot that had these glitches, then the other satellites should be OK. But if the entire lot is faulty, we may start seeing the clocks on other sats start failing in the enxt few years, assuming that the clock performance seems to degrade after three and a half years.

In that case, the entire system will need to be replaced- both IRNSS and Galileo.

The Rubidium atomic clocks should have a lifetime of atleast 12 years. With that being the case, the gap between manufacturing to launch is going to be fairly small.

 

[mayfair]

The Rubidium atomic clocks should have a lifetime of atleast 12 years. With that being the case, the gap between manufacturing to launch is going to be fairly small.

That would be the norm. But if this batch is faulty, as it appears to be from the Galileo and IRNSS-A incidents, then the entire lot may start showing the same issues.

But as you pointed out, the gap between manufacturing and lauch must have been minimal to maximise the clock lifecycle, in that case, one should expect that the Rubidium clocks in the later IRNSSs came from different lots. If it's a batch error, then hopefully IRNSS-A would be one off, but if there's a more serious problem- design error or tooling error for instance, then all the subsequent batches may have been affected as well and we may see the rest of the NAVIC sats develop the same problems down the line.

The reports say that ISRO and Galileo team at ESA are in touch, so hopefully they'll find some way around this.

 

[Kshatriya87]

Save the date: ISRO gears up for its mega-launch of 104 satellites on February 15!
By Zee Media Bureau | Last Updated: Monday, January 30, 2017 - 23:36

New Delhi: The final date is here! The Indian Space Research Organisation (ISRO) has decided to make its path-breaking move of launching 104 satellites in one go on February 15.

"These will be 100 micro-small satellites, which will be launched using a PSLV (Polar Satellite Launch Vehicle)- C37. The weight of the payload will be 1350 kgs, of which 500-600 kgs will be the satellite's weight," Somnath added.

According to the Times of India, in the payload of 104 satellites, 101 will be foreign satellites including the latest addition of a nano-satellite. Remaining three will be Indian satellites including the Cartosat series-2D with remote sensing high resolution camera which finds its application in defence and strategic purposes.

Last year, ISRO launched 22 satellites at a go and this launch will have almost five times the number of crafts.

At the same time, Russia had launched a record 37 satellites in a single mission in 2014 and the US space agency NASA had launched 29 satellites at one go.

 

[Akask kumar]

3 atomic clocks fail on IRNSS sat. Swiss junk.

does this mean , one of the IRNSS satellite is useless. because without clock cycle you cannot run any electronic circuit..will this satellite be replaced bu a new one? @Indx TechStyle

 

[Akshay_Fenix]

does this mean , one of the IRNSS satellite is useless. because without clock cycle you cannot run any electronic circuit..will this satellite be replaced bu a new one? @Indx TechStyle

Yep, its now a junk sat drifting in space. What are the odds of losing 1 primary and 2 back-up atomic clocks of the same satellite? Geez no luck at all.

Replacement will be sent in June 2017 as atomic clocks are major component for satellite navigation.

 

[Akask kumar]

Yep, its now a junk sat drifting in space. What are the odds of losing 1 primary and 2 back-up atomic clocks of the same satellite? Geez no luck at all.

Replacement will be sent in June 2017 as atomic clocks are major component for satellite navigation.

failure of 1 primary and 2 back up clock raises some suspicion.. is this sabotage by china? what was the cause of failure??

 

[Indx TechStyle]

does this mean , one of the IRNSS satellite is useless.

Yes,

will this satellite be replaced bu a new one? @Indx TechStyle

IRNSS-2A will be launched this year.

 

[salute]

does this mean , one of the IRNSS satellite is useless. because without clock cycle you cannot run any electronic circuit..will this satellite be replaced bu a new one?

or maybe its not used for running electronic circuit but for calculating and error correction between time differences on the ground and satellites .

 

[Adioz]

Yes,
IRNSS-2A will be launched this year.

I remember reading that ISRO had prepared/was preparing two back-up satellites for IRNSS constellation (to be launched at a short notice).
Also, i remember reading that IRNSS has redundancy and that failure of just 1 satellite will not stop NAVIC-based devices.
Is this true?

 

[Akask kumar]

or maybe its not used for running electronic circuit but for calculating and error correction between time differences on the ground and satellites .

without clock cycle there cant be any machine cycle..without machine cycle,a processor cant execute a program,and without a running program u cant do any calculation..

clock is like heart of any computational circuitry..

 

[Indx TechStyle]

So, budget was announced today.

Outcome budget 2017-18
http://indiabudget.gov.in/ub2017-18/eb/sbe91.pdf

Space Sciences:..Under this, provision has been included for the expenses of Space Science Programmes undertaken by ISRO which include Sponsored Research (RESPOND), Sensor Payload Development Planetary Science Programme, Climate and Atmospheric Programme, Small Satellite for Atmospheric Studies and Astronomy, Space Science Promotion, Aditya 1, Indian Lunar Mission (Chandrayaan 1 and II), X ray Polarimeter Mission (XpoSat), Space Docking Experiment Mission, Mars Orbiter Mission II and Mission to Venus.
Official Now!!

 

[Adioz]

So, budget was announced today.

Outcome budget 2017-18
http://indiabudget.gov.in/ub2017-18/eb/sbe91.pdf

Space Sciences:..Under this, provision has been included for the expenses of Space Science Programmes undertaken by ISRO which include Sponsored Research (RESPOND), Sensor Payload Development Planetary Science Programme, Climate and Atmospheric Programme, Small Satellite for Atmospheric Studies and Astronomy, Space Science Promotion, Aditya 1, Indian Lunar Mission (Chandrayaan 1 and II), X ray Polarimeter Mission (XpoSat), Space Docking Experiment Mission, Mars Orbiter Mission II and Mission to Venus.
Official Now!!

Its amazing how they plan to do so much with a planned-CAPEX of just $616 million.

BTW, what is XPoSat? Observatory like Astrosat?
Also, What do they plan to do under Climate and Atmospheric programme?
Would the expenditure for launch vehicle development programme fall under the "Space Technology" header?
Also, I have never heard about plans to make NAVIC a global system. I do believe they plan to do it eventually. By what year do you think they plan to take it global?

 

[Indx TechStyle]

BTW, what is XPoSat? Observatory like Astrosat?

Ya
http://defenceforumindia.com/forum/...pace-exploration-observatories-orbital.77402/

Also, What do they plan to do under Climate and Atmospheric programme?

You're askin it?

Would the expenditure for launch vehicle development programme fall under the "Space Technology" header?

Yet to come, some allocation was there back in 2016, when I posted.

Also, I have never heard about plans to make NAVIC a global system.

Who told you that?

I do believe they plan to do it eventually. By what year do you think they plan to take it global?

Not in this decade at least.

 

[Adioz]

Who told you that?
Not in this decade at least.

Well I just hoped that we would get a global NAVIC like the Chinese took their Beidou global after a regional pilot. I know its not a priority. Yeah, so maybe we'll get one in the 2030s.

 

[salute]

without clock cycle there cant be any machine cycle..without machine cycle,a processor cant execute a program,and without a running program u cant do any calculation..

clock is like heart of any computational circuitry..

you are talking about processors , this is different unit or is it not ???

 

[kunal1123]

Well I just hoped that we would get a global NAVIC like the Chinese took their Beidou global after a regional pilot. I know its not a priority. Yeah, so maybe we'll get one in the 2030s.

that depend upon India foot print on globe, the more we become global player the more navic become global currently our foot print is not that big. i think we will be seeing extension of navic in scs and Atlantic around 2022 and then whole world around 2030 it take another 7 satellite to extend it to scs and Atlantic ..

 

[Akask kumar]

you are talking about processors , this is different unit or is it not ???

u need a processor to compute the time from rubidium ,quartz etc crystal..

 

[Indx TechStyle]

Department of Space02-February, 2017 15:23 IST
Facilities for Launching Satellites

Indian Space Research Organisation (ISRO) has all the requisite facilities for launching satellites using Indian launch vehicles at its launch complex located at Satish Dhawan Space Centre, Sriharikota. These facilities comprise of (i) two operational satellite launch pads, (ii) Filling Control Centre (FCC) for propellant filling operations and (iii) Mission Control Centre (MCC) & Launch Control Centre (LCC) for coordinating and conducting the launch operations during the countdown phase till the injection of the satellite into orbit.
Currently, the project for the development of Semicryogenic engine has been approved and the Semicryogenic engine is under development. The various activities carried out towards the development of the Semicryogenic engine include- (i) Indigenous realisation of 35 materials and 22 coating processes (ii) Qualification of indigenous bearings for turbo pumps (iii) Fabrication of the first hardware for three engine subsystems including low pressure turbo pumps and one high pressure turbo pump through industry (iv) Design validation of the low pressure turbo pumps through cold flow trials.
An advanced space launcher that can deliver ten-tonne and heavier communication satellites to space requires a booster stage with clustered Semicryogenic engines. After the successful qualification of the Semicryogenic engine, the development of the Semicryogenic booster stage with clustered engines is expected to be initiated.
The spacecrafts that are likely to be launched in the next two years using Indian launch vehicles include - four communication satellites, seven earth observation satellites, one navigation satellite and one space science satellite. Also, two communication satellites are planned to be launched from abroad onboard the Ariane 5 launcher.
This information was provided by the Union Minister of State (Independent Charge) Development of North-Eastern Region (DoNER), MoS PMO, Personnel, Public Grievances & Pensions, Atomic Energy and Space, Dr Jitendra Singh in a written reply to a question in Rajya Sabha today.
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KSD/NK/PK

(Release ID :157921)

 

[Indx TechStyle]

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