Time

Boreas has been designed to provide a highly accurate time reference. It contains a temperature compensated disciplined oscillator that corrects itself very precisely using GNSS time. When a GNSS fix is available, the Boreas time is accurate to within 20 nanoseconds.

If greater accuracy is required for your application, Advanced Navigation may be able to offer Boreas with a temperature compensated disciplined oscillator that has greater time accuracy than 20 nanoseconds and less than 3 μs/hr of drift. Contact Advanced Navigation's sales department at sales@advancednavigation.com for more information.

When Boreas hot-starts the time accuracy is typically within 1-2 seconds immediately on startup and corrected to within 50 nanoseconds as soon as a GNSS fix is achieved.

The time can be accessed via the following means:

• A 1PPS output over GPIO or the Auxiliary port, see 1PPS Output of the Dynamic Pin Functions.

• A built-in Precision Time Protocol (PTP) version 2 server for synchronisation with network-connected devices which require high accuracy time. The PTP server broadcasts PTP messages (Sync, Follow Up, Announce) to multicast IP address 224.0.1.129. The PTP broadcasts are sent whenever an Ethernet connection is established and cannot be disabled.