IRNSS system / NavIC

By admin March 22, 2019 10:30

Aim – To design and develop an independent satellite based navigation system for providing positioning, navigation and timing services for users over Indian region.

Primary service area– India as well as the region extending up to 1500 km from its boundary

Extended Service Area– Beyond primary service area upto area enclosed by the rectangle from Latitude 30° South to 50° North, Longitude 30° East to 130° East. It is designed with a constellation of seven satellites.

7 satellites- 1. IRNSS-1A (2013), 2. IRNSS-1B &1C (2014), 3. IRNSS-1D (2015), 4. IRNSS-1E, 1F & 1G (2016), 5. IRNSS-1H (2017- unsuccessful), 6. IRNSS-1I (2018)

Provide two types of services 1. Standard Positioning Service (SPS) which is provided to all the users 2. Restricted Service (RS), which is an encrypted service provided only to authorised users.

Atomic clock

An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards are 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 such as GPS.

Rubidium atomic clocks

  • Navigation requires the most accurate clocks and NavIC relies on rubidium clocks.
  • Each of the seven satellites has three of them on-board.
  • However, in 2017, the ISRO confirmed that the clocks on the first satellite, IRNSS-1A had failed in June 2016.
  • Without its clocks, the IRNSS-1A “will give a coarse value. It will not be used for computation.”
  • Rubidium atomic clocks were the previous standard in accurate clocks and most organisations, that need precise time estimates, need caesium clocks. It is learnt that future clocks on such satellites, each with a lifespan of 10 years, will host such clocks.

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IRNSS-1I The eighth navigation satellite to join the IRNSS space segment and has replaced IRNSS-1A Like its other IRNSS predecessors, IRNSS-1I also carries two types of payloads – navigation payload and ranging payload. The navigation payload of IRNSS-1I transmits signals for the determination of position, velocity and time. This payload is operating in L5-band and S-band. Rubidium atomic clocks are part of the navigation payload of the satellite. The ranging payload of IRNSS-1I consists of a C-band transponder, which facilitates accurate determination of the range of the satellite. It also carries Corner Cube Retro Reflectors for LASER Ranging.

Applications of IRNSS system

  • 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

Read More:- IRNSS system / NavIC

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By admin March 22, 2019 10:30