What is "glonass-m"

GLONASS-M , also known as Uragan-M ( GRAU Index 11F654M and manufacturing code 14F113) are the second generation of Uragan satellite design used as part of the Russian GLONASS radio-based satellite navigation system. Developed by ISS Reshetnev (Reshetnev Information Satellite Systems), it had its debut launch in 2003, and is in the process of being phased out. Its production is expected to finish in 2015 and as of July, 2015, its last launch is expected in late 2017. It is an evolution of the previous Uragan ( GRAU Index 11F654) second-generation satellites, improving accuracy, increasing power, extending the design life and adding the FDMA L2OF open signal.