| 摘要 |
Aspects of the present disclosure are directed to communications between devices. As consistent with one or more embodiments, a local device has a first clock, a low-frequency (LF) transmitter and a high-frequency (HF) transceiver. A remote device includes a second clock, a LF receiver and a HF transceiver. An LF signal is transmitted from the local device to the remote device and used to synchronize the second clock. The first clock is synchronized based on an HF signal transmitted to the local device using the synchronized second clock and a first predetermined time delay relative to receipt of the LF signal. The second clock is resynchronized based on a second HF signal transmitted to the remote device using the first clock and a second predetermined time delay relative to receipt of the first HF signal, while accounting for a trip time for communicating one or both of the HF signals. |
