Author Topic: NavIC/IRNSS discussion  (Read 22354 times)

Offline vyoma

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« Last Edit: 08/26/2016 05:25 AM by vyoma »

Offline vyoma

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Re: IRNSS discussion
« Reply #1 on: 05/26/2015 03:10 AM »
http://www.isro.gov.in/applications/step-towards-initial-satellite-based-navigation-services-india-gagan-irnss

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A step towards initial Satellite based Navigation Services in India: GAGAN & IRNSS

The Indian Space Research Organization (ISRO) and Airports Authority of India (AAI) have implemented the GPS Aided Geo Augmented Navigation-GAGAN project as a Satellite Based Augmentation System (SBAS) for the Indian Airspace. The objective of GAGAN to establish, deploy and certify satellite based augmentation system for safety-of-life civil aviation applications in India has been successfully completed. The system is inter-operable with other international SBAS systems like US-WAAS, European EGNOS, and Japanese MSAS etc. GAGAN GEO footprint extends from Africa to Australia and has expansion capability for seamless navigation services across the region. GAGAN provides the additional accuracy, availability, and integrity necessary for all phases of flight, from enroute through approach for all qualified airports within the GAGAN service volume. GAGAN Payload is already operational through GSAT-8 and GSAT-10 satellites. The third GAGAN payload will be carried onboard GSAT-15 satellite which is scheduled for launch this year.

Initially, Director General of Civil Aviation (DGCA) certified GAGAN for enroute operations (RNP 0.1) on December 30, 2013 and subsequently on April 21, 2015 for precision approach services (APV 1). APV1 Certified GAGAN signals are being broadcast with effect from May 19, 2015. GAGAN is the first SBAS system in the world to serve the equatorial region. GAGAN ionospheric algorithm known as ISRO GIVE Model-Multi-Layer Data Fusion (IGM-MLDF) was developed by ISRO and is operational in the implemented GAGAN System. India has become the third country in the world to have such precision approach capabilities.

GAGAN though primarily meant for aviation, will provide benefits beyond aviation to many other user segments such as intelligent transportation, maritime, highways, railways, surveying, geodesy, security agencies, telecom industry, personal users of position location applications etc.

IRNSS, the Indian Regional Navigation Satellite System, is an ISRO initiative to design and develop an independent satellite-based navigation system to provide positioning, navigation and timing services for users over Indian region. The system is designed with a constellation of 7 spacecraft and a vast network of ground systems operating. The first three satellites (IRNSS-1A, 1B &1C) were launched in 2013-14.

IRNSS-1D, the fourth satellite of IRNSS constellation was successfully launched on March 28, 2015 on board PSLV-C27. The initial tests of the spacecraft have been successfully completed and it has joined the family of IRNSS space segment. With the addition of fourth spacecraft the minimum satellite requirement is met and independent position solution is demonstrated for the first time using an Indian satellite-based navigation system. The unique Geostationary Earth Orbit (GEO) /Geo Synchronous Orbit (GSO) constellation design provides a position accuracy of better than 15 metre for longer duration of 20 hours in a day even with 4 satellites.

ISRO has released the ‘IRNSS Signal-in-Space interface control document for Standard Positioning Service ver 1.0’, the document that comprehensively provides all the information required by user receiver manufacturers. The document is available for download at http://irnss.isro.gov.in.

While GAGAN will redefine navigation over Indian Airspace, IRNSS will provide independent and self reliant satellite based navigation services over Indian region
« Last Edit: 05/26/2015 03:12 AM by vyoma »

Offline Ohsin

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Re: IRNSS discussion
« Reply #2 on: 05/26/2015 05:25 AM »
They should really start showcasing navigational service working and any other info on industries adapting it, hardware etc..

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The ISRO would drive navigation in the country with chipsets and other smart products.

A Hyderabad company was making a dongle-like tool that could be plugged to a laptop or a tablet PC.
Source(last line)
« Last Edit: 05/26/2015 05:26 AM by Ohsin »
"Well, three cheers to Sharma, but our real baby is INSAT."

Offline vyoma

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Re: IRNSS discussion
« Reply #3 on: 05/27/2015 03:11 AM »
Indigenous Rubidium atomic will be used for next-gen IRNSS satellites:

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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.

http://www.thehindu.com/news/national/tamil-nadu/india-developing-atomic-clocks-for-use-on-satellites/article7229191.ece

Offline vyoma

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Re: IRNSS discussion
« Reply #4 on: 07/20/2015 09:16 AM »
http://www.insidegnss.com/node/4545

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India’s regional navigation constellation, IRNSS, has demonstrated independent three-dimensional position determination for the first time using a combination of geostationary and geosynchronous satellites now in orbit. Earlier this year, IRNSS reference receivers and user receivers demonstrated a positioning accuracy of 10–15 meters, as per the design objectives for four satellites. Since then, position fixes using stand-alone IRNSS receivers have been possible with an accuracy of better than 15 meters for a minimum of 18 hours in a day over India as the result of the continuous visibility of GEO/GSO satellites to the system’s ground segment. The navigation software team from the Indian Space Research Organization describes this achievement.

Offline vyoma

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Re: IRNSS discussion
« Reply #5 on: 09/26/2015 08:28 AM »
http://www.thehindubusinessline.com/news/user-meet-on-navigation-satellite-system-on-oct-8/article7681675.ece

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BENGALURU, SEPTEMBER 25: 
The Global Navigation Satellite System (GNSS) – User Meet 2015 will be held here on October 8.

It will bring together GNSS-based industries – receiver manufacturers, PNT service providers, application developers, content providers and the user community along with the academia on a common platform.

The meet is being organised jointly by the Indian Space Research Organisation (ISRO) and Airports Authority of India (AAI) at ISRO Satellite Centre here.

Offline beidou

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Re: IRNSS discussion
« Reply #6 on: 09/30/2015 08:15 PM »
Does anyone have any ideas when IRNSS-1G will be launched?

Online russianhalo117

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Re: IRNSS discussion
« Reply #7 on: 10/01/2015 06:19 AM »
Does anyone have any ideas when IRNSS-1G will be launched?
its currently a replenshment payload for LON.

Offline Ohsin

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Re: IRNSS discussion
« Reply #8 on: 10/08/2015 03:49 PM »
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GSAT-15 satellite with GAGAN payload is slated for launch by November 10
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We expect by March 2016 all the seven constellation of IRNSS to be in orbit
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"....already we are having within the country provisions of providing it, we are also looking at how we can extend it to SAARC countries and in the near future gradually extend it over the entire globe,"

 Asked how global, he said "set of regional things you add it becomes global, it is a thought process on which we are now working with few of the countries...right now we are doing 1500 km beyond the border, so we can keep adding regions to those things and get global."

Source:ET


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Satellite-based systems: Application aplenty, but commercialization key
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"We'll need our own receivers that can be integrated, we will need simulators," he said. More than 200 receivers
 
 Isro Chairman AS Kiran Kumar said that in the coming months, more than 200 receivers designed and developed by Isro will become operational, he said, adding that even those receivers from the private industry can be made use of.
 
 "In fact, the Semiconductor Complex Limited (run by the Ministry of Information and Technology) in Chandigarh has designed and developed more than 28 products and I must say that there is a lot of work happening in the field," Kiran Kumar said, speaking of the various chips and receivers that need to be used for implementing a navigation system.
Source: ToI

"Well, three cheers to Sharma, but our real baby is INSAT."

Offline beidou

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Re: IRNSS discussion
« Reply #9 on: 10/08/2015 09:36 PM »

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We expect by March 2016 all the seven constellation of IRNSS to be in orbit


Wow, how could this be true? Current there is even no plan of launching the 7th IrNss satellite. I think this is just a boast...
« Last Edit: 10/09/2015 08:34 PM by beidou »

Offline Ohsin

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Re: IRNSS discussion
« Reply #10 on: 10/09/2015 04:07 AM »
Wow, how could this be true? Current there is even no plan of launching the 7th IrNss satellite. I think this is just a boast...

Any basis of that assertion? And it is a HUGE one by the way. Why would there be no plan to launch 7th satellite? And a guy in such an position of responsibility would just randomly choose to 'boast' when  it can fall flat in just few months and don't forget the presence of elephant in the room which will be even more a talking point in April 2016. So do tell if there is any source or valid reason for cancellation of 1G as you said.
« Last Edit: 10/09/2015 07:54 AM by Ohsin »
"Well, three cheers to Sharma, but our real baby is INSAT."

Offline vineethgk

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Re: IRNSS discussion
« Reply #11 on: 10/09/2015 04:16 PM »
A snapshot from an ISRO presentation (I think) that was posted before, had depicted IRNSS as an 11 satellite constellation with 4 additional sats in GSO. Any news if they have any immediate plans to augment IRNSS with these 4 birds?

Also, IRNSS being GEO/GSO orbits, would it theoretically enable faster satellite locks for a user in the Indian subcontinent with an IRNSS enabled device, than it would be with GPS?

Offline beidou

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Re: IRNSS discussion
« Reply #12 on: 10/09/2015 08:37 PM »
Wow, how could this be true? Current there is even no plan of launching the 7th IrNss satellite. I think this is just a boast...

Any basis of that assertion? And it is a HUGE one by the way. Why would there be no plan to launch 7th satellite? And a guy in such an position of responsibility would just randomly choose to 'boast' when  it can fall flat in just few months and don't forget the presence of elephant in the room which will be even more a talking point in April 2016. So do tell if there is any source or valid reason for cancellation of 1G as you said.

I cannot prove there is NO launch plan, but you should prove to us that there IS a plan for launching 1G.


Offline vineethgk

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Re: IRNSS discussion
« Reply #13 on: 10/09/2015 10:00 PM »
I cannot prove there is NO launch plan, but you should prove to us that there IS a plan for launching 1G.

Well, AFAIK ISRO has been saying all along that this will be a 'seven' satellite constellation once operational.

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The space segment consists of the IRNSS constellation of seven satellites. Three satellites will be located in suitable orbital slots in the geostationary orbit and the remaining four will be located in geosynchronous orbits with the required inclination and equatorial crossings in two different planes. All the satellites of the constellation are being configured identically. The satellites are configured with I-1K Bus to be compatible for launch on-board PSLV.

Source

Now the Chairman of ISRO himself says that they plan to have all 'seven' in orbit by March 2016. I do not get the confusion. Is your point just that there hasn't been much information in the public domain 'specifically' for IRNSS-1G? ;)

Offline Ohsin

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Re: IRNSS discussion
« Reply #14 on: 10/10/2015 05:17 AM »
I cannot prove there is NO launch plan, but you should prove to us that there IS a plan for launching 1G.

This was the plan 3 months ago.
http://forum.nasaspaceflight.com/index.php?topic=35783.msg1392830#msg1392830

So far there have been just minor schedule changes. And as Vineet said,it is clear from regular official quotes in media they've stuck to Annual Report.

On other note two of IRNSS sats it seems are sharing a spot doing their figure eights.
"Well, three cheers to Sharma, but our real baby is INSAT."

Offline vyoma

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Re: IRNSS discussion
« Reply #15 on: 10/12/2015 03:22 AM »
http://www.deccanherald.com/content/505901/chinas-overtures-space-worry-india.html

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While four satellites of IRNSS is already in the orbit, the fifth one is scheduled to be launched in December and the next two by March, 2016.

Offline chota

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Re: IRNSS discussion
« Reply #16 on: 10/12/2015 10:40 PM »

Offline chota

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Re: IRNSS discussion
« Reply #17 on: 10/12/2015 10:58 PM »
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Six more satellites are planned to be launched during 2015-16. These are two communication satellites GSAT-6 and GSAT-15; three navigation satellites IRNSS-1E, IRNSS-1F & IRNSS-1G

http://gadgets.ndtv.com/science/news/indias-second-lunar-probe-chandrayaan-2-to-be-launched-in-2017-690028

Offline kanaka

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Re: IRNSS discussion
« Reply #18 on: 11/27/2015 09:46 AM »
Any updates on IRNSS signals and receivers and implementation of GAGAN in Indian Airports?

Offline Ohsin

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Re: IRNSS discussion
« Reply #19 on: 11/27/2015 02:08 PM »
Any updates on IRNSS signals and receivers and implementation of GAGAN in Indian Airports?

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    "We'll need our own receivers that can be integrated, we will need simulators," he said. More than 200 receivers

    Isro Chairman AS Kiran Kumar said that in the coming months, more than 200 receivers designed and developed by Isro will become operational, he said, adding that even those receivers from the private industry can be made use of.

    "In fact, the Semiconductor Complex Limited (run by the Ministry of Information and Technology) in Chandigarh has designed and developed more than 28 products and I must say that there is a lot of work happening in the field," Kiran Kumar said, speaking of the various chips and receivers that need to be used for implementing a navigation system.

http://timesofindia.indiatimes.com/home/science/Satellite-based-systems-Application-aplenty-but-commercialisation-key/articleshow/49271260.cms


« Last Edit: 11/27/2015 02:09 PM by Ohsin »
"Well, three cheers to Sharma, but our real baby is INSAT."

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