IRNSS-1E is slated for launch on January 20 from the space port of Sriharikota in Andhra Pradesh.
"...From the regional navigation point of view, earlier we had launched four satellites. Another satellite IRNSS-1E is on the launch pad. It is slated for launch on January 20," ISRO Satellite Centre (ISAC) Director M Annadurai said.
He said (IRNSS) 1F and 1G satellites were also in the very advanced stages of integration at the Bangalore satellite centre.
The constellation of seven satellites was planned by ISRO to constitute IRNSS, which would be at par with US-based GPS once the full complement of spacecrafts are launched.
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While four satellites would be sufficient to start operations of the IRNSS system, the remaining three would make it more accurate and efficient.
Annadurai was speaking at a session on 'Space science technology and applications' at the ongoing 103rd Indian Science Congress on the second day here.
He also said ISRO was setting up a space park in 100 acres at Bengaluru to facilitate private players with the infrastructure to take part in space-related projects.
On the scientific discovery that the Mars Orbiter satellite has been able to make so far, Distinguished Scientist and former Director of ISAC S K Shivakumar said, "If you ask me about methane gas detection, we are yet to find exact sources and all that.."
He said, "..I really don't have the update how much of science have we been able to find out..."
Shivakumar, who was speaking on Mars Mission at a session, said the satellite was fine and functioning "as usual".
Different payloads for different experiments were all working, he said, adding "we are quite happy that all these things are going quite well."
Reiterating that the Mars Orbiter Mission may last 'many years', Shivakumar said, "we still have 37 kilo grams of fuel."
Scripting space history, India on September 24, 2014 successfully placed the low-cost Mars Orbiter Mission (MOM) spacecraft in orbit around the Mars in its very first attempt, breaking into an elite club.