Oxford Technical Solutions
56
Figure 30.
NAVconfig CAN signal properties window
Heading lock
When stationary for extended periods of time, the heading of systems using only one GNSS
antenna can drift. The heading lock option solves this by locking the heading to a fixed value
while the system is stationary. Using both antennas with a dual antenna system will also keep
the heading stable in which case heading lock is not necessary.
Heading lock cannot be used with host vehicles that can turn on the spot (i.e. without
longitudinal velocity). Note that simply turning the steering wheel while stationary is often
enough to change the heading on most road vehicles.
Select an option from the drop-down list. Table 17 gives a description on each of the heading
lock options.
Table 17.
NAVconfig heading lock options
Heading Lock
Description
Disabled
Disables heading lock. Should be used if the vehicle can turn on the spot
Normal
Best for most applications. Assumes that the heading of the vehicle does not
change by more than 2° while the vehicle is stationary. The heading accuracy
recovers quickly when the vehicle moves
Tight
Assumes that the heading of the vehicle does not change by more than 0.5° while
the vehicle is stationary. The recovery is fast if the heading of the vehicle does not
change but will be slow if the vehicle turns before it moves