India Moves Closer Towards Its Own Navigation Satellite System
"There is relevance for our existence," he added.
Radhakrishnan had earlier said though IRNSS is a seven-satellite system, it could be made operational with four satellites.
He had said each satellite will cost around 
150 crore and there will be a total of nine (seven in the space and two as stand-by on ground).
The PSLV XL version used to put the satellites in orbit costs around 130 crore. The seven rockets would involve an outlay of around 910 crore.
In addition there will be investments made in setting up a chain of ground stations which will be around 1,000 crore, Radhakrishnan had said.
Once the regional navigation system is in place, India need not be dependent on others.
The IRNSS will provide two types of services -- standard positioning service and restricted service. The former is provided to all users and the later is an encrypted service for authorised users.
The IRNSS system comprises of two segments-the space and the ground. The space segment consists of seven satellites of which three will be in geostationary orbit and four in inclined geosynchronous orbit.
The ground segment consists of infrastructure for controlling, tracking and other facilities.
The fourth navigation satellite is expected to be launched this December, said Jitendra Singh, minister of state for Prime Minister's Office.
"Through space technology we have entered the phase of Make in India. As India moves forward to become a world leader in 21st century, the leadership should be based on science. India has emerged as a world leader in the space technology," he added.
"We are working on GSLV Mark III launch. Another IRNSS satellite launch mission will be in December-January," said MYS Prasad, director, Satish Dhawan Space Centre.
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