Chapter 3 SMART7 Operation
SMART7 Installation and Operation User Manual v6
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3.5.1 Dual-Frequency GLIDE
NovAtel’s dual-frequency GLIDE technology adds to the superior pass-to-pass performance provided by single-
frequency GLIDE. Dual-frequency GLIDE is ideal for agricultural and machine guidance applications where rel-
ative positioning is critical. Using GLIDE significantly reduces the variation in position errors to less than 1 cm
from one epoch to the next. Dual-frequency GLIDE improves the absolute accuracy of the GLIDE position and
creates a robust solution resistant to the effects of high ionospheric activity. GLIDE works in all code positioning
modes, including single point, DGNSS and SBAS.
Refer to the NovAtel white paper on
for more information on GLIDE and
dorange/Delta-Phase (PDP) and GLIDE Filters
along with other information available from
.
3.5.2 PDP and GLIDE Configurations
Pseudorange/Delta-Phase (PDP) and GLIDE position filters can be used for single-frequency single point,
WAAS or DGNSS positioning. Refer to the
PDPFILTER
command and
PDPMODE
command in the
Commands and Logs Reference Manual
To reset the PDP or GLIDE filter:
pdpfilter reset
To enable the PDP filter:
pdpfilter enable
Ensure the
PDPFILTER
command is used before the
PDPMODE
command. Set the PDP type and kinematic
type according to the application. For most kinematic applications:
pdpmode relative dynamic
or
pdpmode relative auto
The rest of the setup is position type and log dependent according to the application. See the
PSRDIFFSOURCE
,
INTERFACEMODE
,
SERIALCONFIG
and other configuration commands which are out-
lined in the
Agriculture Commands and Logs Reference Manual
. Also refer to the NovAtel application note
038 Pseudorange/Delta-Phase (PDP) and GLIDE
available from our web site at
.
3.6 STEADYLINE
The STEADYLINE
®
functionality helps mitigate the discontinuities that often occur when the receiver changes
GNSS positioning modes. The effect is especially evident when a receiver transitions from an RTK position
mode solution to a lower accuracy “fall back” solution, such as DGPS, WAAS+GLIDE or even autonomous
GLIDE (see
Figure 10: Positioning Change Without STEADYLINE
below). Smooth transitions are particularly
important for agricultural steering applications where sudden jumps are problematic.
Figure 10: Positioning Change Without STEADYLINE
The STEADYLINE feature internally monitors the position offsets between all the GNSS positioning modes
present in the receiver. When the current positioning mode becomes unavailable, the receiver transitions to the
next most accurate positioning mode.
