Operation OEM6 Cards and Enclosures
Chapter 4
OEM6 Family Installation and Operation User Manual Rev 12
62
4.4.3
Prefer Accuracy
The positioning mode change depends on the accuracy level of the positioning modes.
When the position mode is changing from a more accurate mode to a less accurate mode (e.g., changing
from RTK to GLIDE), the receiver uses the Maintain option.
When the position mode is changing from a less accurate mode to a more accurate mode (e.g., GLIDE to
RTK), the receiver uses the Transition option.
For example, a receiver is configured to do both RTK and GLIDE. If this receiver has a fixed RTK position
and experiences a loss of correction data causing the loss of the RTK solution it will immediately apply the
offset between the two position modes and uses the GLIDE position stability to maintain the previous
trajectory. Over time the GLIDE (or non-RTK) position will experience some drift. Once the RTK position is
achieved again the receiver will start using the RTK positions for position stability and will slowly transition
back to the RTK positions at a default rate of 0.005 m/s or the time specified in the
STEADYLINE
command.
Figure 27: STEADYLINE Prefer Accuracy
4.4.4
UAL
The STEADYLINE mode used depends on the BESTPOS and GPGGA solution types.
When the solution type is OPERATIONAL, the receiver uses the Maintain option.
When the solution type is WARNING, the receiver uses the Prefer Accuracy option. When the receiver
changes from WARNING to OPERATIONAL, it will continue to use the Prefer Accuracy option until any
existing offset is gone.
When the solution type is OUT_OF_BOUNDS, the STEADYLINE feature is disabled.
The thresholds used to determine the solution type (OPERATIONAL, WARNING or OUT_OF_BOUNDS),
can be specified using the UALCONTROL command. Refer to the
OEM6 Family Firmware Reference
(OM-20000129) for more information.
Figure 28, STEADYLINE UAL- Warning Limit Example
on page 63 and
Figure 29, STEADYLINE UAL - Out
on page 63 show an examples of STEADYLINE using the UAL mode.
Position
Intended Path
change to
lower accuracy
solution
change to
higher accuracy
solution
UAL mode will not function unless UALCONTROL is enabled using the
UALCONTROL
command. For more information about the UALCONTROL command, refer to the
(OM-20000129).
