Author Topic: GSLV MkII F12 - NVS-01 (aka IRNSS-1J) - SLP - 29 May 2023 (05:12 UTC)  (Read 32461 times)

Offline Steven Pietrobon

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Cutoff.

Separation!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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ISRO Chairman. Happy that the fixes have worked on CUS. Total of five satellites in second generation.
« Last Edit: 05/29/2023 05:50 am by zubenelgenubi »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Mission director. First flight of GSLV-II with 4 m fairing.
« Last Edit: 05/29/2023 05:50 am by zubenelgenubi »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Satellite Director. Believes naughty boy has been full tamed.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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SAC Director. Feels like climbing Everest.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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URSC Director. Long time since ISRO launched its own satellite to GEO. Solar panels have deployed.
« Last Edit: 05/29/2023 05:43 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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LPSC Director. Seven propulsion systems. All performed extremely well.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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IPRC Director.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Tracking Director.

IISU Director. First magnetically levitated reaction wheels being flown.
« Last Edit: 05/29/2023 05:47 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline zubenelgenubi

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Is this really IRNSS-1J?   I thought 1J to 1L were spares of the I1K-based design, while this is the first I2K-based IRNSS so I would have expected it to be IRNSS-2A or  something like that.
I haven't seen the designation 'IRNSS-1J' being used by ISRO and is not mentioned on the press-kit.
It had the project name "IRNSS-1J" initially but was renamed to NVS-1 a few years back. Launch vehicle i believe was intended to be PSLV originally but was switched to GSLV along with name change. ISRO's annual report from a few years back states that NVS-1 is intended to replace IRNSS-1G which was launched on a PSLV in 2016. I have attached a copy of ISRO's annual report from 2020-2021. Refer to pages 46-47 for more info on NVS-1.
I changed the "a.k.a." in the thread title to IRNSS-2A.

What happened to 1J, 1K, and 1L?  Were they never manufactured or completed?

NSF India launches new-generation navigation satellite aboard GSLV, May 28
Quote
Beginning with NVS-01, the second-generation satellites will fly with Indian-developed atomic clocks in place of the units manufactured by Swiss company SpectraTime which were flown on previous spacecraft.

With a mass of 2,232 kilograms, NVS-01 is also over 900 kilograms heavier than the first-generation satellites and incorporates other enhancements to expand the capabilities of the NavIC constellation. These include broadcast of a new L1 signal, in addition to the L5 and S-band signals broadcast by the existing satellites, which will improve interoperability with other satellite navigation systems such as the US Global Positioning System (GPS) network.

The new second-generation spacecraft, including NVS-01, are based on ISRO’s I-2K satellite bus instead of the I-1K platform used on the first-generation spacecraft. Powered by a pair of solar arrays generating up to 2.4 kilowatts, the satellites have a design life of at least 12 years.

The increased mass of the second-generation satellites renders them too heavy for the Polar Satellite Launch Vehicle (PSLV) rockets that were used to deploy the first generation. Instead, they will be carried aboard the more powerful Geosynchronous Satellite Launch Vehicle, or GSLV, using the Mk.II version of this rocket.
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Offline Steven Pietrobon

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VSSC Director.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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VSSC SHAR Director. Congrats Team India.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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ISRO Chairman wrapping up. Next GSLV launch is Insat 3DS, happening soon. Same rocket with NISAR. Coming months with PSLV, GSLV Mk.III and test vehicle for Gaganyan. Further PSLV and SSLV launches as well.
« Last Edit: 05/29/2023 05:57 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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End of webcast.

Congratulations to ISRO and India for the successful launch!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline FutureSpaceTourist

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twitter.com/nasaspaceflight/status/1663050820647022594

Quote
LAUNCH! ISRO's GSLV Mk.II rocket launches with NVS-01.

Overview:
nasaspaceflight.com/2023/05/india-… - by William Graham (@w_d_graham).

Livestream:
youtube.com/watch?v=nGRsTQ…

https://twitter.com/nasaspaceflight/status/1663051390665539585

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Staging. It's a bit off its trajectory but classed as nominal.

Offline FutureSpaceTourist

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Offline K210

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Congratulations to ISRO for a successful GSLV launch after nearly 2 years!

Also it is worth pointing out the orbit achieved (173km x 40,079km) is higher than the intended orbit of (170km x 36568km) that is mentioned in the brochure. That ~4000km higher apogee will no doubt help prolong the life of the satellite as less delta-v will be required for it to reach its final orbit.

Thank you Steven for your coverage of the live stream. 
« Last Edit: Today at 06:29 am by K210 »

Offline FutureSpaceTourist

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Offline zubenelgenubi

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Thank you, Steven!
Congratulations to the entire launch campaign team! 🎊 👏 🥳
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Offline TheVarun

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I started to be concerned 😟 when I noted the slight deviations on the graphs.

  When I saw this, I sank a bit!  Oh no, here we go again with a possible failure of the GSLV Mk2.  Very uplifting to know of the successful mission!  There are some new technologies involved in this launch/mission, hope we hear about them in the days to come.

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