Context: Minister of Ports, Shipping and Waterways, recently inaugurated the indigenous Differential Global Navigation Satellite System (DGNSS) called ‘SAGAR SAMPARK’. About Sagar Sampark:
  • It is a terrestrial based enhancement system that corrects the errors and inaccuracies in the Global Navigation Satellite System (GNSS) and provides more accurate positioning information.
  • Aim:
    • Ensuring safety: To help mariners in safe navigation and will reduce the risk of collisions, groundings, and accidents in the port and harbour areas.
    • Aiding radio signals: To assist the Director General of Lighthouses and Lightships (DGLL) to provide radio aids to ships for marine navigation
  • Significance:
    • Minimising error: A GNSS receiver has the potential to achieve accuracies of up to 10 centimetres. Sagar Sampark will help mariners to error correction accuracy from 5 to 10 metres to less than 5 metres for 100 Nautical Miles from Indian coastlines.
    • Augmenting correction: It will improve the accuracy of GPS positioning and reduce errors caused by atmospheric inferences, satellite clock drift, and other factors.
    • Enhancing Compliance: It will fulfil India’s obligations towards International Maritime Organisation (IMO), Safety of Life at Sea (SOLAS) and International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA).
Additional Information  What is Differential GNSS?
  • Working of GNSS: In order to establish a position, GNSS receivers use timing signals from at least four satellites, and any number of errors or delays can occur during the signals’ transit to earth.
  • Accurate positioning: DGNSS is an enhancement to GNSS that was developed to correct these errors and inaccuracies in the GNSS system, allowing for more accurate positioning information. Access to this correction information makes differential GPS and GNSS receivers much more accurate than other receivers.
 News Source: pib

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