GLONASS (Global Navigation Satellite System) is the Russian satellite navigation system, the counterpart to Galileo and the Global Positioning System (GPS). The installation of the first three MEO satellites
in space took place as early as 1982. The installation of the other satellites took many years and was only completed in 2011. The constellation of Glonass consists of 24 satellites, which are MEO satellites orbiting the Earth
inthree orbital paths at an altitude of 19,100 km, the inclination angle to the equator is 64.8°, and the orbital period is 11 hours and 15.8 minutes. 21 of the 24 satellites are operational, the remaining three serve as spares.resolution and C/A code, but also a high-resolution service with Precision Encrypted Code
(P/Y code). Theresolution itself is slightly lower than that of the GPS system.
Glonass, together with the GPS system, can improve positioning accuracy. For this purpose, there are dual navigation devices that can receive both navigation systems.