Time synchronization via SYMPHONIE High Accuracy Low Cost (HALO)

The High Accuracy-Low cost (HALO) sidetone method, a modulation emitter, and a demodulation receiver were developed to meet accuracy and narrow band width requirements. The functional principle of HALO is described. Field measurements were performed with one modem and time comparative measurements with the two HALO modems. Compact arrangement, simple control of the station periods, and optimization of time signals regarding emission efficiency and band width are required. The HALO is an interface between comparative normal and link signals and produces an HF transfer signal from the comparative normal signals. The accuracy of 1 ns for time synchronization can be improved. The components developed for HALO can be applied to phase-sensitive systems.