IRNSS Launch and Discussions

[vasu raya]

ok, if the data on gps tracks is there, what is the current monitoring mechanism? none

[sivab]

http://www.insidegnss.com/auto/novdec14-THOMBRE.pdf

This paper describes IRNSS accuracy measurements using signals received from 3 sats (available at that time) in Finland.

[sudeepj]

Very interesting @sivab. So the three Satellites that were launched till that time, in the IGSO and the GEO orbits were visible all the way to Finland! 5000 kms away from IRNSS primary coverage area.

Compare the distance of Finland to the primary coverage area with the distance of Beijing and Shanghai. At least four IRNSS satellites will be visible from Beijing at any time! The PDOP (https://en.wikipedia.org/wiki/Dilution_ ... sion_(GPS)) will not be as good as it could be with these satellites, as in, the accuracy will degrade a bit, but at least you will be able to get reasonable quality fixes (20-30meters accuracy). Good enough for strategic payloads.

We should offer South Korea an IRNSS compatible 4 satellite system over the Korean peninsula at a noprofit-noloss basis. That will make the PDOP good over all of China and also make it difficult for the Chinese to interfere with the system, as the ownership of that system will be with South Korea.

The 'range residuals' (measurement of the distance between the satellite and the receiver) for the IRNSS satellites are a bit higher compared to GPS, but no doubt, as we gain more experience in operating the constellation, it will go down.

[vasu raya]

Then there is the postal address to NAVIC coordinates translation, the postman has the job of recording the known postal address with the coordinates using a hand held device when delivering mail. From google maps at its highest resolution I get 9 + 9 + 2 digits for the lat, long and altitude for a location. One can translate that to a bar code or scan code if needed. For handling the civilian resolution one could mask the last few digits of lat and long as well remove zip code specific digits to make it compact. This will help in address standardization.

Say this database is of certain size, one should extend the courtesy to all SAARC countries; got to find some other means with non cooperating ones like the TSP, where there is the distinct advantage of pinpointing Jihadi locations as every shanty is barcoded.

[arun]

PSLV-C33 / IRNSS-1G Update : The first apogee raise maneuver of IRNSS-1G has been successfully carried out for 1147 sec from 13:05 hrs IST on April 29,2016.Orbit Determination results from this LAM firing are: Apogee X perigee height was changed to 35903 kmX 317.74 km. Inclination is 17.86 deg. Orbital period is 10 hr 35 min. –

See: Clicky 1

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Apr 30, 2016. PSLV-C33 / IRNSS-1G Update : Second LAM firing of IRNSS-1G, at apogee for 1581 sec has been successfully completed on April 30, 2016 starting from 04:52:17 hrs IST. –

See: Clicky 2

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May 01, 2016. Orbit Determination results from second LAM firing are:apogee X perigee height was changed to 35803km,7750km,Inclination is 10.77deg.Orbital period now is 13h 03m 35sec –

See : Clicky 3

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May 01, 2016. Third LAM firing of IRNSS-1G, for 1609sec has been successfully completed on 01.05.2016 starting from 06:59:07 hr IST. –

See: Clicky 4

[suryag]

have the IRNSS receiver specs been released? I dont see any activity in developing these receivers in the market

[arun]

Clicky:

May 02, 2016.

Orbit Determination results from the third LAM firing are: apogee X perigee height was changed to 35813km, 29050km, Inclination is 5.72deg. Orbital period now is 21hr 08m 09sec.

[Rakesh]

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