Comments on 'IEEE 1588 Clock Synchronization using Dual Slave Clocks in a Slave'

摘要

In the above letter, Chin and Chen proposed an IEEE 1588 clocksynchronization method based on dual slave clocks, where they claim thatmultiple unknown parameters --- i.e., clock offset, clock skew, andmaster-to-slave delay --- can be estimated with only one-way time transfersusing more equations than usual. This comment investigates Chin and Chen's dualclock scheme with detailed models for a master and dual slave clocks and showsthat the formulation of multi-parameter estimation is invalid, which affirmsthat it is impossible to distinguish the effect of delay from that of clockoffset at a slave even with dual slave clocks.