The Beidou navigation system is a project by the People's Republic of China to develop an independent satellite navigation system. "Beidou" is the Chinese name of the Ursa Major constellation. nkjlhli jhhhhhhhhhhhhhhhhhh ESA information on EGNOS Information on the Beidou system German Federal Waterways Administration Traffic Technologies Centre Information on GPS / DGPS Categories: Satellite navigation systems ... Ursa Major (Ursa Maior in Latin) is a constellation visible throughout the year in the northern hemisphere. ...
Beidou 1A was launched on 30 October2000 and Beidou 1B followed on 20 December2000. China plans to complete the system with a second pair, and Beidou 2A was put into orbit on 24 May2003. October 30 is the 303rd day of the year (304th in leap years) in the Gregorian Calendar. ... This article is about the year 2000. ... December 20 is the 354th day of the year (355th in leap years) in the Gregorian calendar. ... This article is about the year 2000. ... May 24 is the 144th day of the year in the Gregorian calendar (145th in leap years). ... 2003 (MMIII) is a common year starting on Wednesday of the Gregorian calendar. ...
Unlike the GPS, GLONASS, and Galileo systems, which offer global positioning, Beidou uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are visible. Over fifty GPS satellites such as this NAVSTAR have been launched since 1978. ... GLONASS GLONASS (Russian ГЛОÐÐСС; Ð“Ð›ÐžÐ±Ð°Ð»ÑŒÐ½Ð°Ñ ÐÐÐ²Ð¸Ð³Ð°Ñ†Ð¸Ð¾Ð½Ð½Ð°Ñ Ð¡Ð¿ÑƒÑ‚Ð½Ð¸ÐºÐ¾Ð²Ð°Ñ Ð¡Ð¸Ñтема; Globalnaya Navigatsionnaya Sputnikovaya Sistema. ... The Galileo positioning system is a proposed satellite navigation system, to be built by the European Union as an alternative to the US military-controlled Global Positioning System and the Russian GLONASS. The system should be operational by 2010, two years later than originally anticipated. ... A geostationary orbit (abbreviated GEO) is a circular orbit directly above the Earths equator (0º latitude). ...
China has also associated itself with the Galileo project, which is not yet operational.
Modern satellite navigationsystems require the reception of microwave signals from several satellites, all of which broadcast the satellite's location, and the precise time the signal was transmitted.
Satellite navigation receivers reduce the error by using combinations of signals from multiple satellites and multiple correlators, and then using techniques such as Kalman filtering to combine the noisy, partial, and constantly changing data into a single estimate for position, time, and velocity.
The same applies to the use of smart bombs: the operator of a satellite navigationsystem can effectively degrade the performance of smart bombs being used by other states using its satellite navigationsystem to that of gravity bombs, or even offset them from their targets in such a way as to render them useless.
For these reasons, a satellite navigationsystem is an essential asset for any aspiring military power.
Thus, as satellite navigation becomes an essential service, countries without their own satellite navigationsystems effectively become client states of those which supply these services.
The best known satellite navigationsystem is the United States' Global Positioning System (GPS).
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