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The Polar Satellite Launch Vehicle (PSLV) C24 carrying regional navigational satellite IRNSS 1B successfully lifted off today from the Sriharikotta space station, around 80 kms from Chennai.

The Polar Satellite Launch Vehicle (PSLV) C24 carrying regional navigational satellite IRNSS 1B successfully lifted off today from the Sriharikotta space station, around 80 kms from Chennai.

The 26th flight of PSLV carries the 1,432 kg IRNSS-1B, the second satellite of the Indian Regional Navigation Satellite System (IRNSS). Terrestrial navigation is one of the primary applications of IRNSS, an independent regional navigation satellite system, which is developed by India.

The IRNSS system, which would ultimately have seven satellites, was targeted to be completed by 2015 at a total cost of Rs 1,420 crore. Today's launch is second of the seven.

As scheduled the vehicle took off from the space port at 17:14 hrs on Friday. Unlike GSLV, PSLV was assembled on the launch pad and the Vehicle assembly building moves back. In case of GSLV its made in a fixed vehicle assembly building and moved to the launch pad. Technology variants and methodology adopted is great, says a posting in Isro's Facebook.

The satellite is designed to provide accurate position information service to users in India as well as the region extending upto 1,500 kms from its boundary. It has an expected lifespan of around 10 years.

K Radhakrishnan, chairman, Isro said "the launch was successful and it was injected very preciously. I thank the entire Isro team that made this major milestone for the country, proving it again India's PSLV as a place of pride".

Application of IRNSS includes 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 navigation for drivers, said Isro sources.

IRNSS-1B is the second navigation satellite of the seven satellites constituting the IRNSS space segment. In July 2013, IRNSS-1A was launched by PSLV-C22 (both the vehicles have the similar configuration).

The satellite has been realised in less than seven months after the launch of its predecessor.

IRNSS will provide two types of services, including 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 System is expected to provide a position accuracy of better than 20 m in the primary service area and the services are to be beneficial to various sectors including defense, according to experts.

The satellite system also comprises of a space segment and a ground segment. While the space segment consists of seven satellites, with three satellites in geostationary orbit and four satellites in inclined geosynchronous orbit.

IRNSS-1A, the first Satellite of the IRNSS constellation, has already started functioning from its designated orbital slot after extensive on orbit test and evaluation to confirm its satisfactory performance, said Isro.

It is expecting to start receiving signals from 1B by the end of 2014. Another two navigation satellites are also expected to be launched in 2014, said sources.

IRNSS ground segment is responsible for navigation parameter generation and transmission, satellite controls, ranging and integrity monitoring and time keeping.

This will be the sixth time XL configuration is being flown, while the previous five include PSLV-C11 for Chandrayaan-1, PSLV-C17/GSAT-12, PSLV C19/ RISAT-1, PSLV-C22/IRNSS-1A and PSLV-C25 Mars Orbiter Spacecraft missions.

The mission life would be around ten years for IRNSS-1B.

Applications of IRNSS include terrestrial aerial and marine navigation, disaster management, vehicle tracking and fleet management, navigation aide for hikers and travellers, visual and voice navigation for drivers.

The system is similar to the global positioning system of the US, Glonass of Russia, Galileo of Europe, China's Beidou or the Japanese Quasi Zenith Satellite System.
(By: Business Standard)

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