The Russian GLObal NAvigation Satellite System (GLONASS), navigation satellite system is based on a constellation of active satellites which continuously transmit coded signals in two frequency bands that can be received by users anywhere on the Earth's surface to identify their position and velocity in real time based on ranging measurements. In the future a third frequency for GLONASS signal transmission will be introduced. In some areas of application, the use of combined GPS, GLONASS and GALILEO constellation appears to be preferable option.
The System of Differential Correction and Monitoring (SDCM) is intended for development and real-time transfer of the adjusting information for GLONASS, GPS and GALILEO systems (integrity data, wide-area and local correction data) to civilian customers. It is expected that SDCM based on GLONAS/SGPS signals will provide increased (in comparison with basic level) accuracy of position determination in real time at any point in the Russian Federation.
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