忙碌的全球定位競爭：GPS、Galileo 、QZSS 、Beidou...'Quantum Accelerometer' ...

China is building a $9 billion rival to the American-run GPS https://bloom.bg/2RflDM3

'Quantum Accelerometer' Tracks Location Without GPS

ExtremeTech · 13 hours ago

Imperial College's quantum compass cools atoms to navigate without GPS

TheINQUIRER · 19 hours ago

Finland Probes Possible Russian GPS Jamming During NATO Exercises

RFE/RL · 18 hours ago

中國制定了雄心勃勃的國家太空發展計劃。接下來的任務包括今年12月份的無人月球車登月行動以及2020年發射火星探測器的計劃。根據計劃，中國北斗衛星導航系統將於2020年完成建設，與美國全球定位系統(Global Positioning System, 簡稱GPS)展開競爭。

Main article: Satellite navigation

Comparison of geostationary, GPS, GLONASS, Galileo, Compass (MEO), International Space Station, Hubble Space Telescope, Iridium constellation and graveyard orbits, with the Van Allen radiation belts and the Earth to scale.^[a] The Moon's orbit is around 9 times larger than geostationary orbit.^[b] (In the SVG file,hover over an orbit or its label to highlight it; click to load its article.)

Other satellite navigation systems in use or various states of development include:

• GLONASS – Russia's global navigation system. Fully operational worldwide.
• Galileo – a global system being developed by the European Union and other partner countries, which began operation in 2016,^[165] and is expected to be fully deployed by 2020.
• Beidou – People's Republic of China's regional system, currently limited to Asia and the West Pacific,^[166] global coverage planned to be operational by 2020^[167][168]
• IRNSS – A regional navigation system developed by the Indian Space Research Organisation.
• QZSS – A regional navigation system in development that would be receivable within Japan.