Russia plans to launch at least five GLONASS navigation satellites this year. According to the Russian News Agency, the country will continue the construction of the GLONASS navigation satellite network this year and launch at least five satellites. According to the plan, Russia will launch two Glonass-K satellites in the second to third quarter of this year, and two Glonass-K2 satellites in the third to fourth quarter. Eventually, at the end of the year, the Glonass-M series of satellites will be launched. Compared with the previous M model, the latest Glonass-K2 model satellite has improved technical indicators and enhanced operational life. In addition to transmitting signals in the L1 and L2 frequency bands, Glonass-K can also transmit differential code navigation signals in the L3 frequency band. IT House learned that as of now, Russia's GLONASS navigation system contains 28 satellites, of which 23 are in operation, two are under maintenance, two are undergoing flight testing, and one is used as a backup