Differential for GLONASS-BeiDou
Russia and China are setting up a joint 'Differential Corrections and Monitoring' augmentation system.
The 2 countries are in the process of setting up a joint Differential Corrections and Monitoring (SDCM) high-precision satellite navigation overlay. Plans for the system were first mentioned in 2015, with high precision being achieved by expanding both countries' network of SDCM system stations working with the Russian GLONASS and Chinese BeiDou systems.
The system is planned to have a positioning accuracy of ~1 metre and will open with the creation of 3 Russian stations in China and 3 Chinese ones in Russia. A further 46 SDCM ground stations are planned to be constructed in Russia and 8 more in neighbouring countries' territories. The additional number to be built in China has not been revealed.
GLONASS, launched in 1993, comprises 27 satellites, of which 24 are operational. The system gives worldwide cover. BeiDou, with 20+ satellites, currently provides navigation services only within China and neighbouring regions; it will ultimately have 35 satellites and provide worldwide cover. Both systems currently give an accuracy of ~10 m.
In May 2016, China and Russia signed a BeiDou-GLONASS system compatibility and interoperability cooperation agreement, marking a new stage of navigation cooperation between the countries.
Details from the link below . .