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A pulse per second (PPS or 1PPS) is an electrical signal that has a width of less than one second and a sharply rising or abruptly falling edge that accurately repeats once per second. PPS signals are output by radio beacons, frequency standards, other types of precision oscillators and some GPS receivers.[1][2] Precision clocks are sometimes manufactured by interfacing a PPS signal generator to processing equipment that aligns the PPS signal to the UTC second and converts it to a useful display. Atomic clocks usually have an external PPS output, although internally they may operate at 9,192,631,770 Hz.[3] PPS signals have an accuracy ranging from 12 picoseconds to a few microseconds per second, or 2.0 nanoseconds to a few milliseconds per day based on the resolution and accuracy of the device generating the signal.
- ^ [1] Archived 2015-09-23 at the Wayback Machine M. Siccardi, About time measurements, EFTF 2012
- ^ [2]ICD-GPS-060B: GPS User Equipment (Phase III) Interface Control Document for the Pecise Time and Time Interval (PTTI) Interface, Global Positioning System Joint Program Office, 2002
- ^ BIPM (September 4, 2019). "SI Units 2019 Brochure" (PDF) (9th ed.). Retrieved September 13, 2019.