India is looking forward to start its own Navigational system. At present most of the countries are dependent on America’s Global Positioning System (GPS). India is all set to have its own navigational system named Indian Regional Navigation Satellite System (IRNSS). IRNSS is going to be fully functional by mid of 2016. IRNSS is designed to provide accurate position information through out India. It also covers 1500 kms of region around the boundary of India. IRNSS would have 7 satellites, out of which 4 are already placed in orbit. The fully deployed IRNSS system consists of 3 satellites in GEO orbit and 4 satellites in GSO orbit, approximately 36,000 km altitude above earth surface.
The four deployed satellites are IRNSS-1A, IRNSS-1B, IRNSS-1C, IRNSS-1D. Further IRNSS-E is planned to be launched by January and IRNSS-F, G by March 2016.
IRNSS will provide two types of services, namely, Standard Positioning Service (SPS) which is provided to all the users and Restricted Service (RS), which is an encrypted service provided only to the authorised users.
Senior ISRO official said that – both these L and S-band signals received from seven satellite constellation of the IRNSS are being calculated by a special embedded software which reduces the errors caused by atmospheric disturbances significantly. This, in turn, gives a superior quality location accuracy than the American GPS system.
The IRNSS Signal-in-Space Interface Control Document (ICD) for Standard Positioing Service (SPS) is released to the public to provide the essential information on the IRNSS signal-in-space, to facilitate research & development and aid the commercial use of the IRNSS signals for navigation-based applications. You can refer to this document on ISRO’s website.
At present, only America’s GPS and Russia’s GLONASS (GLObal NAvigation Satellite System) are independent and fully functional navigational systems. India will be the third country to have its own navigational system.
The main advantage of Indian own navigational system is that India won’t be dependent on US’s GP System for defence operations. India had no options till now. During kargil war Indian Army and Air force had to use GPS. The information related to security operations are very confidential and should not be shared with anyone.