USING LORAN FOR TERRESTRIAL TIME TRANSFER

摘要

Techniques for allowing a remote receiver (such as a small cell) to derive a precise time reference (such as Coordinated Universal Time (UTC)) when the remote receiver is not able to derive time directly from received GPS signals. The remote receiver receives LORAN signals from a LORAN station and determines the propagation time from the LORAN station to the remote receiver. The remote receiver derives a precise time reference from the received LORAN signals and the propagation time. The remote receiver may receive additional timing information from a reference station.

主权项

1. A method for deriving a precise time reference at a receiver when GNSS signals are not directly available at the receiver, comprising:
determining that GNSS signals are not directly available for acquisition at the receiver; receiving LORAN signals from a LORAN station at the receiver; determining the propagation time for the LORAN signals traveling between the LORAN station and the receiver; and deriving a precise time reference from the received LORAN signals and the propagation time.