Wi-Wi STAMP is a wireless time synchronization protocol developed by Japan's NICT, using the 900 MHz band for picosecond-level time sync and millimeter-level distance accuracy. Current prototypes achieve 20ps phase jitter and 30ns time sync, with next-gen targeting 5ns in real-world use. The system is housed in a smartphone-sized box.
Jeff Geerling tests a prototype wireless time synchronization system called Wi-Wi, which can achieve sub-5 nanosecond accuracy using off-the-shelf components. The system works by measuring round-trip signal delays over WiFi-like radio links to precisely synchronize clocks.
The ertm15-llrf-wr project on GitLab provides a high-performance White Rabbit timing receiver designed for achieving femtosecond-level jitter accuracy. It is part of the Open Hardware Repository (OHWR) and focuses on precise time synchronization for applications requiring extremely low timing errors.
White Rabbit is an open-source project providing sub-nanosecond synchronization for large distributed systems, developed at CERN. It extends Ethernet with precise time transfer for deterministic data delivery across thousands of nodes.