China Launches BeiDou Navigation Satellite System

• 01 Aug 2020

Why in News

China has formally launched full global services of its BeiDou-3 Navigation Satellite System (BDS).

Key Points

• Background:
  
  • The name BeiDou comes from Chinese word for the Big Dipper or Plough constellation.
  • China's BeiDou navigation project was launched in the early 1990s. The system then became operational within China in 2000 and in the Asia-Pacific region in 2012.
  • The navigation satellite system was completed in three steps: BDS-1 which provided services to China, BDS- 2 to provide services to the Asia-Pacific region and BDS-3 which provides services worldwide.
• Features:
  
  • A hybrid constellation consisting of around 30 satellites in three kinds of orbits: Geostationary Earth Orbit (GEO), Inclined Geo-Synchronous Orbit (IGSO) and Medium Earth Orbit (MEO).
  • Provides navigation signals of multiple frequencies, and is able to improve service accuracy by using combined multi-frequency signals.
  • Offers accurate positioning, navigation and timing, as well as short messaging communication, international search and rescue, satellite-based augmentation, ground augmentation and precise point positioning, etc.
  • The services are used in various fields by China including defence, transportation, agriculture, fishing, and disaster relief.
  • It will be the fourth global satellite navigation system after the USA GPS, Russia’s GLONASS and European Union’s Galileo.
    
    • It is said to be much more accurate than the USA’s GPS.
    • Global Navigation Satellite System (GNSS) is a general term describing any satellite constellation that provides Positioning, Navigation, and Timing (PNT) services on a global basis.

Implications

• Challenge to the Centrality of the USA: While China says it seeks cooperation with other satellite navigation systems, Beidou is being seen as a rival to America’s GPS, Russia’s GLONASS and the European Union’s Galileo networks.
• Military Implications: The development of its own secure and independent navigation system will boost China’s military strength, especially amidst rising US-China tensions.
• Economic Implications: The better accuracy and experience of BDS, as claimed by China will lure companies to sign-up for it. As the global market is being increasingly dominated by an information-based economy, China is expected to reap huge economic benefit from BDS.
• China’s Hold on Other Nations: China is promoting its use in the countries signed-up for its Belt and Road Initiative (BRI). Pakistan has already started using BDS. This will certainly give China economic and political leverage over nations adopting this system.
• Edge over India: This has also given China a competitive edge over India, whose IRNSS-NavIC is still a regional navigation system.
• Importance in Covid Times: The world is becoming heavily dependent on space infrastructure due to the impact of COVID-19 limitations on in-person physical meetings and travel restrictions. Thus, information and space-based services will gain importance in present times.
• China’s Authority in Space: The space program of China has seen rapid advancements in past few years with the launch of Tianwen-1 rover mission to Mars. China has also constructed an experimental space station and sent a pair of rovers to the surface of the moon (Chang’e-4). BDS is another step in marking China’s presence in Space.

IRNSS ― NavIC (India)

• The Indian Regional Navigation Satellite System (IRNSS), which was later given the operational name of NavIC or NAVigation with Indian Constellation, is the regional satellite navigation system of India.
• Launched and operated by the Indian Space Research Organisation (ISRO), IRNSS covers India and nearby regions extending up to 1,500 km.
• The constellation consists of 7 active satellites, out of which three are located in Geostationary Earth Orbit (GEO) and four in Inclined Geo-Synchronous Orbit (IGSO).

Satellite Orbits

• An orbit is a regular, repeating path that an object in space takes around another one. An object moving around a planet in an orbit is called a satellite. According to the height of satellites from the earth, the orbits can be classified as
  
  • High Earth orbit (mostly weather and communication satellites),
  • Medium Earth orbit (most navigation satellites) and
  • Low Earth orbit (Scientific satellites like NASA’s Earth observing Fleet).

• Geo-Synchronous orbit : A geosynchronous orbit is any orbit which has a period equal to the earth's rotational period.
• Geostationary Orbit: A Geostationary Orbit is a time of Geosynchronous orbit in the same plane as that of the equator.

Source: HT