Timing & Synchronization CN

1 Pulse Per Second Monitoring (1PPS)

1 pulse per second monitoring is used to keep clocks aligned and to check timing stability when devices are separated by distance. A 1PPS signal marks the start of each UTC second and is commonly produced by GNSS, including GPS timing receivers or GPS-disciplined oscillators. This page describes where 1PPS is used in practice, including telecommunications, navigation, finance, metrology, and distributed scientific experiments.

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Illustration showing a GNSS satellite in orbit, labeled with onboard atomic clocks, transmitting timing signals to a GNSS receiver on the ground. The receiver determines the UTC second boundary and generates a one-pulse-per-second (1 PPS) output. A single 1 PPS signal line is shown connecting directly to a Swabian Instruments Time Tagger, which uses the pulse to perform precise timestamping, measure timing offset and jitter, and analyze clock stability.

Frequency Stability Analysis

Role of timing electronics in Frequency Stability Analysis

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Frequency Stability Analysis

Phase Noise Analysis

Role of timing electronics in Frequency Stability Analysis

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Illustration of the Time Tagger setup for phase analysis, where four oscillators are connected to the time tagger through input channels, three to be analyzed and one as a reference signal. The Time Tagger collects and timestamps the signals from the oscillators, and then streams the time tags to the PC, a plot of the Single-sidebanded (SSB) phase noise L(f) and the Frequency offset, created by Swabian Instruments’ software.
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