Satellite project to save 1460 crore - " IRNSS-1H "

The Indian Regional Navigation Satellite System (IRNSS) with an operational name of NAVIC ("sailor" or "navigator" in Sanskrit , which also stands for NAVigation with Indian Constellation) is an autonomous regional satellite navigation system, that provides accurate real-time positioning and timing services.

The IRNSS will provide basically two types of services

• Standard Positioning Service (SPS)
• Restricted Service (RS)

The restricted service will also be put to use in the military for missile delivery, navigation and tracking of aircraft. The Indian Air Force has already set up receivers to use the system.

IRNSS-1A is the first of the seven satellites comprising the Navigation Indian Constellation (NavIC), a multi-purpose satellite-based positioning system, envisaged as India’s alternative to the American GPS.

This year that all the three rubidium atomic clocks on board had stopped functioning. Initial efforts to restart the clocks failed. The space agency had decided on launching one of the two spare satellites.

Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems.

The Indian Space Research Organisation (ISRO) is preparing to launch a back-up for IRNSS-1A, one of the seven satellites in the constellation, which has a failure of the atomic clocks on board.PSLV-C39 will launch IRNSS-1H navigation satellite, scheduled in August 2017.