RCB-F9T - Integration manual
3.1.7.5 Freezing the course over ground
If the low-speed course over ground filter is deactivated or inactive (see section
), the receiver derives the course over ground from the GNSS velocity information.
If the velocity cannot be calculated with sufficient accuracy (e.g., with bad signals) or if the absolute
speed value is very low (under 0.1 m/s) then the course over ground value becomes inaccurate too.
In this case the course over ground value is frozen, i.e. the previous value is kept and its accuracy
is degraded over time. These frozen values will not be output in the NMEA messages NMEA-RMC
and NMEA-VTG unless the NMEA protocol is explicitly configured to do so (see NMEA protocol
configuration in the RCB-F9T Interface description [
]).
Figure 4: Flowchart of the course over ground freezing
3.2 Geofencing
3.2.1 Introduction
Figure 5: Geofence
UBX-19003747 - R04
3 Receiver functionality
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Early production information
