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New Delhi: The third satellite in the Indian Regional Navigation Satellite System (IRNSS) will be launched in October, according to the Indian Space Research Organisation (Isro).

The launch window will open in the first week of October, said an Isro spokesperson. This is the window during which conditions are opimal for the satellite to reach the right orbit.

The IRNSS, which will be a constellation of seven satellites, is designed to provide accurate position information service to users in India as well as the region, extending up to 1,500km from India’s boundary. It aims to reduce India’s dependence on foreign navigational systems such as the US global positioning system and the Russian global navigation satellite system.

The 1,432kg satellite will carry navigational payloads that will transmit navigation signals to users, while ranging payloads will help establish the range of the satellite accurately. The system is expected to provide a position accuracy of better than 20 metres in the primary service area.

Isro announced that the second stage of the launch vehicle, the Polar Satellite Launch Vehicle (PSLV) C26, is being stacked at Sriharikota where the launch will take place.

The second satellite in the series, IRNSS 1-B, was launched in April aboard the PSLV-C25. The first satellite was launched in July 2013. Both are functioning from their designated geosynchronous orbital positions.

A fourth launch, for IRNSS-1D, is planned for the end of 2014, and the entire IRNSS constellation of seven satellites is planned to be completed by 2015-16.

The navigational system will provide two types of services—standard positioning service (SPS), which will be provided to all users, and restricted service (RS), an encrypted service provided to authorized users. Once the IRNSS is operational, it can be used for terrestrial, aerial and marine navigation and disaster management. It will be integrated with mobile phones and other such applications.

Ground stations responsible for the generation and transmission of navigation parameters, satellite control, satellite ranging and monitoring, have been established in 15 locations across the country.

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