Year in review: China's major scientific and infrastructure achievements

Core of Beidou navigation satellite network in place

With the last two medium earth orbit satellites of the Beidou's third-generation system launched on Dec 16, China has finished the deployment of the core constellation of its BeiDou Navigation Satellite System.

Currently, there are 46 Beidou satellites in service in space. The China Satellite Navigation Office intends to position two more Beidou satellites in geostationary orbit in the first half of 2020 to finish the deployment of all of Beidou's space-based assets.

Beidou is China's biggest space-based system and is one of four space-based navigation networks, along with the United States' GPS, Russia's GLONASS and the European Union's Galileo.

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