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International Space Flight (ESA, Russia, China and others) => Indian Launchers => Topic started by: Langley on 02/03/2015 08:31 pm

Title: IRNSS Nominal Constellation
Post by: Langley on 02/03/2015 08:31 pm

Are the nominal orbit parameters of the full 7-satellite IRNSS constellation (3 GSO and 4 IGSO) available? I have the orbit longitudes. But I'm looking for the relative phasing information for the IGSOs in particular. A table of the nominal Keplerian elements for all seven satellites (as we have for the full Galileo constellation) would be helpful. Thanks.
-- (Prof.) Richard Langley

Title: Re: IRNSS Nominal Constellation
Post by: Gabbar on 02/04/2015 04:02 pm

Hello Professor, as far as I know, ISRO has not published  any table featuring nominal Keplerian elements of all the seven satellites of the constellation. Also, there are some slight variations in the data that has been published by ISRO till date.

From all the data that is available online, this is what I know:

55°E longitude, 29° inclination, GSO          [IRNSS-1A]
55°E longitude, 29° inclination, GSO          [IRNSS-1B]
83°E longitude, GEO                                  [IRNSS-1C]
34°E longitude, GEO
131.5°E longitude, GEO
111.5°E longitude, 29° inclination, GSO
111.5°E longitude, 29° inclination, GSO

There are plans  for 4 other IGSO satellites to augment the constellation later on:
48.5°E longitude, 42° inclination, GSO
69°E longitude, 42° inclination, GSO
97.5°E longitude, 42° inclination, GSO
121.5°E longitude, 42° inclination, GSO

Sources:

IRNSS-1A
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http://www.isro.gov.in/sites/default/files/pdf/pslv-brochures/PSLVC22.pdf
http://www.n2yo.com/satellite/?s=39199

IRNSS-1B
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http://www.isro.gov.in/sites/default/files/pslv-c24-brochure.pdf
http://www.n2yo.com/satellite/?s=39635


IRNSS-1C
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http://www.isro.gov.in/pslv-c26-irnss-1c-brochure
http://www.n2yo.com/satellite/?s=40269