10 are orbiting at inclined geosynchronous orbits (IGSO). The 37 non-stationary satellites include 27 in medium Earth orbit (MEO). There are 44 satellites on orbit 7 of them are geostationary satellites (GEO). The constellation occupies six orbital planes. The system began trial operations in late 2011 and followed with service to the region bounded by 55☎ longitude to 180☎ longitude and latitude 55°S to 55°N. All the IGSO satellites have an inclination of 55° and are arranged so that one of them is always over the Chinese region. The IGS01, IGS02 and IGS03 satellite are at ~120☎. The acronym IGOS means inclined geosynchronous orbit satellites. The G2 satellite is inactive.įrom 2010 to 2011, the 5 high Earth orbit (HEO) BeiDou-2 satellites with sequential names from Compass-IGS01 to IGS05 were launched and achieved an altitude of approximately 38,000 km. During the period from 2009 to 2012, the 6 GEO BeiDou-2 satellites with sequential names from Compass-G1 to G6 were launched. Similar satellites followed and between 20, there were 5 MEO satellites with sequential names from Compass-M1 to M6 (without an M2) launched. The first BeiDou-2 satellite, a medium Earth orbit (MEO) satellite named Compass-M1, was launched into a circular orbit at 21,500 km at an inclination of 55.5º. In 2007, Xinhua, the government news agency, announced that the People’s Republic of China National Space Administration would launch two more GEO satellites to open the way to a global Chinese Satellite Navigation system to replace the regional BeiDou-1. With the launch of the fourth, BeiDou-1D in 2007 the first BeiDou-1 system was operational, regionally.īeidou-2 (aka Compass) is the second generation of the BeiDou Navigation Satellite System (BDS). A third satellite, BeiDou-1C joined them 3 years later at110.5º E longitude. The first satellites were launched into geostationary (GEO) orbits in 2000 BeiDou-1A at 140º E longitude and BeiDou-1B 80º E longitude. It is a regional satellite navigation system that services a portion of the Earth from 70☎ longitude to 140☎ longitude and from latitude 5°N to 55°N. The first generation of the system is known as BeiDou-1. The system is named after the Big Dipper. The fourth GNSS system, joining those undertaken by the United States- GPS, Russia- GLONASS and Europe- Galileo, will be the Chinese- BeiDou.
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