Author Topic: NavIC/IRNSS discussion  (Read 35720 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:
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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.

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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

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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

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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
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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.”
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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
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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 »

Offline vineethgk

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Re: NavIC/IRNSS discussion
« Reply #91 on: 04/09/2018 11:38 PM »
ISRO working with mobile phone manufacturers to explore the possibility of incorporating NavIC receivers as an integral component during phone manufacturing.

Currently they are supplying a standalone unit that can be connected to the mobile device through an app via bluetooth to supply positional data, cyclone alerts etc for fishermen out at sea.

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Isro chairman Sivan said the receiver will be connected to the mobile phones of fishermen through Bluetooth. They will receive text messages on their position at sea, weather alerts and potential fishing zones. Fishermen need to download an application on their phones to decode and display the text messages.

The satellites’ receiver comes with three components- a chipset, a microcontroller and a Bluetooth module. The receiver, developed by Isro’s Space Applications Centre, Ahmedabad, is also being improved to save power in both mobile and the device.

Isro chairman said, “We are working with mobile phone manufacturers to see if they can incorporate the receiver as a component during manufacturing. Right now, these receivers are available as a separate unit and it can be used in many other applications including as a navigation device in vehicles.”

Source

Offline vineethgk

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Re: NavIC/IRNSS discussion
« Reply #92 on: 04/12/2018 04:14 AM »
ISRO considering a new generation of NavIC/IRNSS sats after IRNSS-1I to improve accuracy
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ISRO Chairman K Sivan told Express on the eve of the launch that IRNSS-1I will be the last in the current ‘approved’ navigation satellite series. “There is a plan for a new IRNSS series. We are working on it and will be submitting a proposal before the Centre. It will be a totally new project,” he said. Sivan said it would be an extension of IRNSS project. Currently, various modalities are being working out like on number of satellites, on board technologies etc. “The idea is to improve the accuracy of services further and also have enough back-up satellites in space just in case there is a situation where one stops functioning like it happened with IRNSS-1A.
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To a query, he said the new IRNSS series is not meant to extend its coverage beyond the regional boundaries.
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“This (coverage) will not change much. It will be only a regional system, but the accuracy will improve,” he said.

The new generation IRNSS might also have the locally-built Rb atomic clocks as one of its distinguishing features.

Offline vineethgk

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Re: NavIC/IRNSS discussion
« Reply #93 on: 05/06/2018 01:59 AM »
ISRO has sought govt approval to launch four more IRNSS satellites equipped with indigenous Rb atomic clocks. 9 out of 21 of the imported SpectraTime clocks in the in-orbit satellites are reported to have failed so far.

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In view of the cascade of failing imported atomic clocks — nine out of the 21 clocks in the fleet have failed — ISRO has decided to add buffers to the NavIC by adding four more satellites. It hopes to have an indigenous atomic clock in each of them. “We are in the process of getting approval [from the government] for at least another four IRNSS satellites,” ISRO Chairman K.Sivan told The Hindu, confirming the failure of clocks. “However, they will have some advanced technology, apart from the atomic clocks developed by ISRO.”
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The indigenous atomic clock is being developed by the Space Applications Centre, Ahmedabad, Mr. Sivan said, adding that once it passes qualification tests, “We will first demonstrate the indigenous clock in an upcoming navigation satellite, along with the imported ones. Work on them is going on in full steam.”
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Until a few months ago, three more satellites were said to have suffered “one or two dysfunctional clocks” each, while two satellites did not have any problematic clocks.
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ISRO is concerned that if more clocks fail, it may render the ₹1,400-crore fleet a dud in space.

Source
« Last Edit: 05/06/2018 02:00 AM by vineethgk »

Offline worldtimedate

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Re: NavIC/IRNSS discussion
« Reply #94 on: 05/06/2018 09:11 PM »
The following Times Of India reports say that ISRO has developed an indigenous atomic clock which is undergoing tests and will be used in the Backup Navigation Satellites.

source :
Isro develops desi atomic clock, to be used in navigation satellites

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In a significant development, Indian Space Research Organisation ( Isro ) has developed an atomic clock that will be used in navigation satellites to measure precise location data. The space agency currently imports atomic clocks from European aerospace manufacturer Astrium for its navigation satellites.

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Tapan Misra, director of Ahmedabad-based Space Applications Centre (SAC), said, "SAC has developed an indigenous atomic clock and this clock is currently undergoing a series of qualification tests. Once it successfully clears all tests, the desi atomic clock will be used in an experimental navigation satellite to test its accuracy and durability in space."

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The SAC director said, "With the development of the desi atomic clock, Isro has become one of the few space organisations in the world which have gained the capability to develop this highly sophisticated technology. We don't know the design and technology of the imported atomic clock. But the desi clock has been developed based on our designs and specifications. This clock is as good as the imported one. We are hopeful that it will easily work for more than five years.".

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According to a reliable source in Isro, nine of the 21 atomic clocks used in some of the seven navigation satellites launched are showing error. Isro is, therefore, planning to launch four backup navigation satellites to keep the Navigation with Indian Constellation (NaVIC) effective. These backup satellites, which are likely to have indigenous atomic clocks too, will add buffer to the desi GPS system. "Isro will first need financial clearance from the government for the backup satellites," says the source.

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Offline vineethgk

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Re: NavIC/IRNSS discussion
« Reply #95 on: 05/16/2018 11:18 PM »
Qualification model of indigenous Rb atomic clock in 'testing-review' phase.

Planning to test its 'space robustness' by December in a satellite with 3 other imported clocks, says SAC Director.

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“The first model which is called the qualification model is currently in the testing-review phase…. By December this year we plan to send one of these clocks along with three others mounted on a satellite. Usually, three atomic clocks go with every satellite. We will be sending four, wherein the fourth one will be the one we have developed indigenously. This will help us to see how robust is our technology. The real proof of its success can be guaged by seeing how it actually functions in space,” Misra added.
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The clock will be mounted on a satellite once ISRO’s Quality Assurance Group provides it with the necessary certification.

Source

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