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Indian Navigational Satellite System

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NASA reports the launch of India’s first navigational satellite launch:

India have launched their Polar Satellite Launch Vehicle (PSLV) on Monday carrying IRNSS-1A, the first satellite of the Indian Regional Navigation Satellite System. Liftoff from the first launch pad at the Satish Dhawan Space Centre occurred at 18:11 UTC (23:41 local time).

The IRNSS-1A satellite is the first of seven which will make up the Indian Regional Navigation Satellite System (IRNSS). The constellation will consist of four satellites in geosynchronous orbits inclined at 29 degrees, with three more in geostationary orbit. IRNSS-1A is one of the geosynchronous satellites, and is expected to be positioned at a longitude of 55 degrees east.

IRNSS-1A will eventually be co-located with a second satellite at 55 degrees east, while two more satellites will be placed at 111 degrees east. The geostationary satellites will operate at 34, 83 and 132 degrees east. The IRNSS system is expected to provide navigation signals to India with an accuracy of up to 20 meters.

IRNSS 1AThe IRNSS-1A satellite is based on the I-1K satellite bus and has a fuelled mass of 1,425 kilograms (3,141 lb), or a dry mass of 614 kg (1,354 lb).

It is powered by two solar arrays, which generate up to 1,660 watts of power. The spacecraft is expected to operate for ten years.

The mission profile made public by ISRO is cryptic:

Indian Regional Navigation Satellite System is India’s own regional navigation satellite system to provide accurate real-time positioning & timing services over India and region extending to 1500 Km around India. It offers two services Standard Positioning Service (SPS) and Restricted Service (RS) with encryption. The fully deployed IRNSS system consist of 3 satellites in GEO orbit and 4 satellites in GSO orbit, approximately 36,000 km altitude above earth surface. Each satellite is configured around I1K bus and is continuously monitored & maintained by ground segment.

Each satellite has two payloads viz. Navigation payload and CDMA Ranging payload in addition with retro-reflector. The payload generates navigation signals at L5 and S-band. The design of the payload makes the IRNSS system inter-operable and compatible with GPS and Galileo.

A few words about the mission come from SHAR:

  • Terrestrial, Aerial and Marine Navigation
  • Disaster Management
  • Vehicle tracking and fleet management
  • Integration with mobile phones
  • Precise Timing
  • Mapping and Geodetic data capture
  • Terrestrial navigation aid for hikers and travelers
  • Visual and voice navigation for drivers

Written by Arhopala Bazaloides

July 2, 2013 at 5:21 am

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