1ナノ秒の無線時刻同期「Wi-Wi」
NABで展示されたWi-Wi STAMPは、NICT（情報通信研究機構）が開発した900MHz帯を利用する無線時刻同期プロトコル。現在の試作機では30nsの時刻同期を実現し、次世代では実環境で5ns以下を達成予定。小型スマートフォンサイズの筐体でピコ秒レベルの位相同期とミリメートル級の距離測定も可能。
関連記事
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.