Author Topic: NavIC/IRNSS discussion  (Read 27250 times)

Offline vyoma

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Re: NavIC/IRNSS discussion
« Reply #80 on: 07/10/2017 05:59 PM »
http://pib.gov.in/newsite/erelease.aspx?relid=167228

MoU signed between ISRO and ISA regarding cooperation in atomic clocks:
Quote
Plan of Cooperation Between the Indian Space Research Organisation (ISRO) and the Israel Space Agency (ISA) regarding cooperation in Atomic Clocks

Offline vyoma

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Re: NavIC/IRNSS discussion
« Reply #81 on: 07/10/2017 06:05 PM »
By the way, AccuBeat is the Israeli company that develops atomic clocks for aerospace. Guessing ISRO might go with this vendor for next set of satellites (pure speculation).

Offline maint1234

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Re: NavIC/IRNSS discussion
« Reply #82 on: 07/11/2017 02:35 PM »
Is the supplier of the failed atomic clocks being held financially responsible for the losses  as it's mentioned in this site that the clocks have a tendency to get short circuited ?

Offline worldtimedate

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Re: NavIC/IRNSS discussion
« Reply #83 on: 07/12/2017 07:36 AM »

By the way, AccuBeat is the Israeli company that develops atomic clocks for aerospace. Guessing ISRO might go with this vendor for next set of satellites (pure speculation).

I thought that India would use its own indigenously developed Atomic Clock for the next series of IRNSS Satellites in the middle of 2025s or later. What is the need for joint development of Atomic Clocks with Israel when ISRO's Lab Satellite Application Center ( SAC ) along with NPL India is in the throes of developing its own ? I think, it is Modi's so-called Make in India Drive that will shut this indigenous efforts. Following are links of some reports that appeared in 2015 quoting ISRO Chairman A. S. Kiran Kumar regarding the indigenous development Rubidium Atomic Clocks.

Quote
The Indian Space Research Organization (ISRO) is developing rubidium-based, high-precision atomic clocks for use in its next series of navigation satellites, ISRO Chairman A.S. Kiran Kumar said on Wednesday.

The ISRO’s Space Applications Centre in Ahmedabad is developing prototypes of atomic clocks, along with the CSIR’s National Physical Laboratory in New Delhi, Dr. Kiran Kumar said on the sidelines of an event organised by the Metrology Society here.

"We still have to make qualified and flight-worthy versions. Our next generation navigation satellites will carry our own clocks" when they start replacing the IRNSS-1 series after their life of 10 years, he said.

A senior scientist says the atomic clock figures among the top critical technologies to be developed indigenously.

Source : India developing atomic clocks for use on satellites

Quote
Kumar said ISRO was also in the process of indigenously developing atomic clock for its next generation navigation satellites. Currently, it is procuring atomic clocks from Europe.

"Right now the prototypes are getting developed; we have to make it into qualified version and then flight worthy version. Our next generation navigation satellite will carry our own atomic clock," he added.

Source : ISRO planning next inter-planetary mission

Quote
CSIR-NPL has developed and transferred the critical technology of Rubidium atomic clock for space applications to ISRO. A model has been developed at CSIR-NPL and is undergoing further developments at Satellite Applications Center before being integrated in the payload of the Indian Regional Navigation Satellite system.

Source : Rubidium Atomic Clock for Space

So, it is quite obvious that this indigenous effort will be put on the backburner because of Modi's Make in India Drive in which so-called joint development between India and Israel. It is a matter of observation   whether Israel would transfer the complete technology to India or an Indian company would engage in nutbolt-screwdriver efforts. But I will keep my finger crossed.

worldtimedate [ http://www.world-timedate.com/ ]

Offline kanaka

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Re: NavIC/IRNSS discussion
« Reply #84 on: 08/04/2017 03:06 AM »

By the way, AccuBeat is the Israeli company that develops atomic clocks for aerospace. Guessing ISRO might go with this vendor for next set of satellites (pure speculation).

I thought that India would use its own indigenously developed Atomic Clock for the next series of IRNSS Satellites in the middle of 2025s or later. What is the need for joint development of Atomic Clocks with Israel when ISRO's Lab Satellite Application Center ( SAC ) along with NPL India is in the throes of developing its own ? I think, it is Modi's so-called Make in India Drive that will shut this indigenous efforts. Following are links of some reports that appeared in 2015 quoting ISRO Chairman A. S. Kiran Kumar regarding the indigenous development Rubidium Atomic Clocks.

Quote
The Indian Space Research Organization (ISRO) is developing rubidium-based, high-precision atomic clocks for use in its next series of navigation satellites, ISRO Chairman A.S. Kiran Kumar said on Wednesday.

The ISRO’s Space Applications Centre in Ahmedabad is developing prototypes of atomic clocks, along with the CSIR’s National Physical Laboratory in New Delhi, Dr. Kiran Kumar said on the sidelines of an event organised by the Metrology Society here.

"We still have to make qualified and flight-worthy versions. Our next generation navigation satellites will carry our own clocks" when they start replacing the IRNSS-1 series after their life of 10 years, he said.

A senior scientist says the atomic clock figures among the top critical technologies to be developed indigenously.

Source : India developing atomic clocks for use on satellites

Quote
Kumar said ISRO was also in the process of indigenously developing atomic clock for its next generation navigation satellites. Currently, it is procuring atomic clocks from Europe.

"Right now the prototypes are getting developed; we have to make it into qualified version and then flight worthy version. Our next generation navigation satellite will carry our own atomic clock," he added.

Source : ISRO planning next inter-planetary mission

Quote
CSIR-NPL has developed and transferred the critical technology of Rubidium atomic clock for space applications to ISRO. A model has been developed at CSIR-NPL and is undergoing further developments at Satellite Applications Center before being integrated in the payload of the Indian Regional Navigation Satellite system.

Source : Rubidium Atomic Clock for Space

So, it is quite obvious that this indigenous effort will be put on the backburner because of Modi's Make in India Drive in which so-called joint development between India and Israel. It is a matter of observation   whether Israel would transfer the complete technology to India or an Indian company would engage in nutbolt-screwdriver efforts. But I will keep my finger crossed.

worldtimedate [ http://www.world-timedate.com/ ]

http://timesofindia.indiatimes.com/india/desi-gps-may-become-a-reality-soon-as-isro-to-sign-mou-with-csir-npl/articleshow/59903879.cms

Offline vineethgk

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Re: NavIC/IRNSS discussion
« Reply #85 on: 08/05/2017 03:02 AM »
IRNSS-1H to carry atomic clocks from the same Swiss manufacturer as it has corrected the hardware problem
Quote
Indian Space Research Organisation will soon launch a replacement navigation satellite fitted with corrected atomic clocks to make up for the crippled satellite, IRNSS-1A.
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Its launch became imperative after all three rubidium atomic clocks on IRNSS-1A failed in mid-2016, Mr. Kumar told The Hindu. Three more clocks failed later across the fleet of seven satellites, which together had 21 atomic clocks.
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“We had problems with all [three] clocks in 1A and needed to bring in the replacement,” Mr. Kumar said, adding that the manufacturer had corrected the problem for the clocks in the new spacecraft. An internal committee had identified the cause of 1A’s failure. The new clocks are identical to the old ones.”
Quote
The clocks for ISRO’s NavIC and the European Space Agency's first 18 Galileo satellites came from the same Swiss company and developed similar problems around the same time. The two agencies had compared their navigation troubles. Mr. Kumar said the hardware solution was also similar for the two agencies.
« Last Edit: 08/05/2017 03:04 AM by vineethgk »

Offline vyoma

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Re: NavIC/IRNSS discussion
« Reply #86 on: 08/07/2017 03:38 AM »
That's good to hear. Hopefully, ISRO will still continue to pursue indigenous atomic clocks.

Offline vineethgk

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Re: NavIC/IRNSS discussion
« Reply #87 on: 08/10/2017 04:08 PM »
IRNSS-1H to move to Sriharikota on Aug-12, VSSC Director hints at the launch of IRNSS-1I later this year
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"The satellite is ready to move from our centre to Sriharikota on August 12 on a special vehicle for integration with the rocket at the space centre," said Annadurai on the margins of a technology event.

The launch authorization board will decide on the date and time after all the checks were completed during the window for the launch schedule.
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The space agency plans to launch an additional space navigation satellite later this year to augment the services of the Rs 1,420 crore NavIC.

"The two spare navigation satellites will make up for any shortfall in the operations and service provided by NavIC to the users round-the-clock over the next 10 years," added Sivan.

Offline worldtimedate

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Re: NavIC/IRNSS discussion
« Reply #88 on: 09/03/2017 06:30 AM »
Despite the gloom looming over the ill-fated IRNSS-1H Satellite that had failed to go into orbit, because of the failure of the Heat Shield to get separated, VSSC Director confirmed that indigenous atomic clocks are under development.

Source : Weight issue not linked to PSLV heat shield glitch: Isro chief

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The unsuccessful launch has necessitated the urgent launch of the ninth navigation satellite IRNSS-1I. Dr Sivan said the "standby ninth satellite will be launched soon".

Dr Sivan also said that the "process to make indigenous atomic clocks has started within the country" by a government organisation. He, however, said that the navigation system is very much operational and is not affected.

worldtimedate [ http://www.world-timedate.com/ ]

Offline vyoma

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Re: NavIC/IRNSS discussion
« Reply #89 on: 09/10/2017 07:37 PM »
Rubidium Atomic Clock for Space

Quote
CSIR-NPL has developed and transferred the critical technology of Rubidium atomic clock for space applications to ISRO. A model has been developed at CSIR-NPL and is undergoing further developments at Satellite Applications Center before being integrated in the payload of the Indian Regional Navigation Satellite system.

Further critical process for development of glass technology of Rubidium bulbs and cells is under development at CSIR-NPL for making the indigenization of space clocks complete.


Offline vineethgk

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Re: NavIC/IRNSS discussion
« Reply #90 on: 09/21/2017 04:38 PM »
Assembly of IRNSS-1I started, targeted for May 2018 as per original plan. No decision yet on building yet another backup
Quote
Is the Assembly of 1I being advanced? Back in December, the consortium of six industries was given six months to work on each spacecraft. The deadline for IRNSS-1I was around May 2018. Dr. Annadurai said that as of now, the timeline was the same. The launch of 1I, when it was ready, would also have to align with ISRO’s other missions, he said.
« Last Edit: 09/21/2017 04:41 PM by vineethgk »

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