Glonass-K is a modernized series of navigation satellites intended for the Global Navigation Satellite System GLONASS. As compared to their predecessors – Glonass-M satellites, they have improved technical characteristics and increased mission lifetimes. The most important difference between Glonass-K and the previous-generation series is that Glonass-K satellites are capable of emitting not only FDMA signals in L1 and L2, but also civil CDMA signals in the L3 frequency band. It is expected to boost the system’s accuracy up to several dozens of centimeters.
Glonass-K satellites also carry payloads supporting the International Satellite-Aided Search and Rescue System COSPAS-SARSAT.
The first Glonass-K satellite was successfully placed into orbit in 2011. ISS-Reshetnev Company is currently developing improved second-generation Glonass-K satellites.
Glonass-K satellites are launched from the Plesetsk cosmodrome aboard Soyuz-2-1b / Fregat rockets.