Russia: Users of satellite navigation systems around the world were experiencing problems this week after Russia’s Glonass satellite positioning system was hit by a major disruption. The reason for the disruption still needs authentically explanation.
According to other reports, the outage was due to false ephemeris upload to the satellites. This resulted in an 11-hour snag which was solved when the satellite reached the next ground station. Most of the 24 satellites that make up the Glonass constellation began broadcasting erroneous data about their locations. The ability of satellite positioning receivers to provide an accurate fix is tied to the accuracy of the signal from space, so the problem immediately affected users.
Source: IT World