Successful GLONASS launch
Russia launched a replenishment satellite for its navigation system on 22 September.
A Soyuz-2.1b rocket launched the Global Navigation Satellite System (GLONASS) M-52 spacecraft into orbit from the Plesetsk Cosmodrome at 0003 UTC on 22 September. The launch had been re-scheduled from 6 September.
The rocket’s Fregat-M upper stage injected the satellite into its targeted circular orbit at an altitude of 11,900 miles (~19,150 km), inclined at 64.8º, giving an orbital period of ~11h 15m.
The constellation comprises 24 satellites in 3 circular orbital planes; each satellite has 3 caesium clocks and a planned life of 7 years. The current system uses 4 FDMA signals in L1 and L2 bands. Claimed accuracy is 100 m publically, with a military capability of 10-20 m.
M-52 will replace a failed satellite in Slot 14. Until it is set to 'operational', there are 23 usable satellites, plus 3 (including M-52) in testing/commissioning.
Further details from the links below . .