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North American Time Synchronization Sources Time Signal Time Provided Accuracy Source Signal Format Hardware Requirements Linux/Unix Software Windows Software GPS: UTC(USNO) 1575.42 MHz: NMEA 0183 sentences, 1PPS signal. Minimum: GPS receiver that works with one's chosen software; this requires some combination of GPGGA, GPRMC, GPZDA, GPGSA ...
In addition to its use in navigation, the Global Positioning System (GPS) can also be used for clock synchronization. The accuracy of GPS time signals is ±10 nanoseconds. [8] Using GPS (or other satellite navigation systems) for synchronization requires a receiver connected to an antenna with unobstructed view of the sky.
IEEE 1588v2 PTP GPS Smartgrid clocks from Tekron [70] IPITEK MSP-1588 [71] Open Time Server : 1GbE, Rubidium IEEE 1588 PTP, NTP, SyncE, PPS GNSS grandmaster clock from Timebeat.app [72] Open Time Server : 10/25GbE, Rubidium IEEE 1588 PTP, NTP, SyncE, PPS GNSS grandmaster clock from Timebeat.app [73]
More complete synchronization systems, although lacking NTP's data analysis and clock disciplining algorithms, include the Unix daemon timed, which uses an election algorithm to appoint a server for all the clients; [19] and the Digital Time Synchronization Service (DTSS), which uses a hierarchy of servers similar to the NTP stratum model.
PPS signals are used for precise timekeeping and time measurement. One increasingly common use is in computer timekeeping, including NTP.Because GPS is considered a stratum-0 source, a common use for the PPS signal is to connect it to a PC using a low-latency, low-jitter wire connection and allow a program to synchronize to it.
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IRIG standard 212-00 defines a different time-code, based on RS-232-style asynchronous serial communication. The timecode consists of ASCII characters, each transmitted as 10 bits: 1 start bit; 7 data bits; 1 odd parity bit; 1 stop bit; The on-time marker is the leading edge of the first start bit.
Clock synchronization: the accuracy of GPS time signals (±10 ns) [114] is second only to the atomic clocks they are based on, and is used in applications such as GPS disciplined oscillators. Disaster relief / emergency services : many emergency services depend upon GPS for location and timing capabilities.