The GB8007 BeiDou/GLONASS/GPS/Galileo time server synchronization system provides accurate synchronization time signals to various power system automation devices by using the second synchronization signals and time information messages sent by BeiDou Navigation System, GLONASS (global navigation satellite system) and GPS (Global Positioning System) satellites. A GNSS time server utilizes the GNSS receiver as a reference time source and distributes the received absolute time throughout the network. By using a time server with NTP the GNSS signal looses its timing accuracy, it is therefore rather reasonable to use an IEEE1588 time server in combination with a GNSS receiver, since PTP is able to distribute the highly accurate GNSS time signal...