The NTP GPS Server is a dedicated device that uses the Global Positioning System (GPS) network time signal. GPS is now a common tool for drivers who have satellite navigation devices on most new cars. But the GPS is far more than just supporting positioning, the GPS network is the atomic clock that is within each GPS satellite.
The GPS system works by transmitting the duration of hours with satellite position and speed. The satellite navigation receiver will work when it receives this time, how long will it take to arrive and thus the signal path. Using three or more of the signals, the satellite navigation device can accurately determine where it is.
GPS can only do this by atomic clocks used to transmit timestamps. These time signals, like all radio signals, are moving at speeds of light, so the inaccuracy of just 1 millisecond (1/1000 second) makes satellite navigation approximately 300 kilometers away.
Since these watches have to be so accurate, they provide the ideal time for the NTP time server. NTP (Network Time Protocol) is the software that allocates time from the time server to the network. GPS time and UTC (Coordinated Universal Time) civilian timing is not exactly the same, but the basis for the same deadline is that NTP has no problem with converting. Using a dedicated NTP GPS server, the network can truly synchronize within milliseconds of UTC
GPS clock is another term often given to a GPS time server. The GPS network includes 21 active satellites (and some backups) that span 10,000 miles above the Earth, and each satellite is circling the Earth twice a day. Designed for satellite navigation, GPS receiver requires at least three satellites to maintain position. At the same time, only one satellite is required for the GPS clock, so it is much easier to get a reliable signal.
Each satellite continuously transmits its position and time. The time code is generated on the onboard atomic clock and is very accurate as this information triangles the situation through the GPS receiver and only half a second on Sat Nav. unit would be inaccurate for thousands of miles.