The Indian Space Research Organisation (ISRO) launched IRNSS-1E, the fifth of the seven-satellite Indian Regional Navigation Satellite System (IRNSS) into space.
- ISRO’s workhorse PSLV C-31 rocket lifted the 1,425 kg satellite from the second launchpad of the Satish Dhawan Space Centre.
- This is ISRO’s first launch for this year.
- The first four satellites launched are — IRNSS-1A, 1B, 1C and 1D were launched in July 2013, April and October, 2014 and March last year respectively.
- IRNSS-1E with a mission life of 12 years was launched into a sub geosynchronous transfer orbit with a 284 km perigee (nearest point to Earth) and 20,657 km apogee (farthest point from Earth) with an inclination of 19.2 degree with reference to the equatorial plane.
- IRNSS-1E carried navigation and ranging payloads, including a rubidium atomic clock, C-band transponder and corner cube retro reflectors for laser ranging.
About Indian Regional Navigation Satellite System
- IRNSS is an independent regional navigation satellite system being developed by India.
- The space segment consists of the IRNSS constellation of seven satellites. Three satellites will be located in suitable orbital slots in the geostationary orbit and the remaining four will be located in geosynchronous orbits with the required inclination and equatorial crossings in two different planes. All the satellites of the constellation are being configured identically.
- It is designed to provide accurate position information service to users in India as well as the region extending up to 1500 km from its boundary, which is its primary service area.
- The Extended Service Area lies between primary service area and area enclosed by the rectangle from Latitude 30 deg South to 50 deg North, Longitude 30 deg East to 130 deg East.
- 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.
- The IRNSS System is expected to provide a position accuracy of better than 20 m in the primary service area.
Some applications of IRNSS are:
- 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 travellers
- Visual and voice navigation for drivers
- IRNSS -1E carries two types of payloads – navigation payload and ranging payload.
- The navigation payload of IRNSS-1E will transmit navigation service signals to the users. This payload will be operating in L5-band and S-band.
- A highly accurate Rubidium atomic clock is part of the navigation payload of the satellite.
- The ranging payload of IRNSS-1E consists of a C-band transponder which facilitates accurate determination of the range of the satellite.
- IRNSS-1E also carries Corner Cube Retro Reflectors for laser ranging.