Beidou Navigation Satellite System

Beidou (Chinese北斗, Pinyin Běidǒu, Big Bear ') is a Chinese satellite navigation system. The regional version of the system was end of December 2011 officially put into operation. The global expansion of the system is still under construction. Beidou is to reduce dependence on the U.S. Global Positioning System (GPS).

Extension

The satellite carried during the project development phase, the working title Compass. After completion of the global system is composed of four geostationary satellites, twelve satellites exist on inclined geosynchronous orbits and nine satellites with trajectories in 22,000 km altitude. As accuracy for public use 10 m for position and 0.2 m / s ( ≈ 0.7 km / h ) given for the speed.

Beidou -1A and -1B were launched on October 30 and December 20, 2000. The satellite 2 of the series are part of the navigation system. Take the positions on the Asia-Pacific region on a 58.75 ° E, 80 ° E, 110.5 ° E and 140 ° E. Beidou - 1C, since May 24, 2003 ave. By April 2012, a total 13 satellite Beidou -2 were launched into space.

On 27 December 2011, the system was officially put into operation, first as a test run. It is Chinese and foreign companies provided and work until the end of 2012 in large parts of Asia and the Pacific. By 2020, the number of satellites is expected to increase for the Chinese navigation system 35.

Current satellite constellation

The satellites are based on the Chinese DFH -3 satellite bus and are about 2200 kg.

On what frequencies to be eventually sent, is not yet fully understood. The current frequency 1561.098 MHz ( E2 ' QPSK), 1589.742 MHz ( E1' QPSK), 1268.52 MHz (E6 QPSK) and 1207.14 MHz ( E5b BPSK) overlap with some signals, the GPS, the Russian GLONASS and European Galileo satellite.

As of July 25, 2013