Chapter 3 SMART7 Operation
SMART7 Installation and Operation User Manual v6
45
Refer to the
Agriculture Commands and Logs Reference Manual
for log and command details.
3.6.1 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 position offset calculated to limit a potential real position jump.
When the position mode is changing from a less accurate mode to a more accurate mode (e.g., GLIDE to RTK),
the receiver slowly transitions to the new reference position type over the time period specified by the Transition
time parameter.
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 pos-
itions at a default rate of 0.005 m/s or the time specified in the
STEADYLINE
command.
Figure 11: STEADYLINE Prefer Accuracy
3.7 Enabling SBAS Positioning
OEM7 receivers are capable of SBAS positioning. This positioning mode is enabled using the
SBASCONTROL
command:
sbascontrol enable auto
When the command is entered, the OEM7 receiver automatically tracks the SBAS that is operating in the region
(e.g., WAAS or EGNOS) and applies the corrections from the service. On a simulator, leave the test mode para-
meter off or specify NONE explicitly. For more on SBAS, refer to application note
(additional Application Notes available at
).
3.8 Enabling PPP
L-Band equipped receivers can achieve sub-meter position accuracy using correction data received from geo-
stationary satellites. To use the L-Band corrections, an L-Band-capable receiver model is required (refer to our
web site
www.novatel.com/products/gnss-antennas
for information on NovAtel L-Band-capable antennas).
For more information on L-Band positioning, refer to:
l
NovAtel Application Notes:
APN-061: NovAtel CORRECT with PPP using TerraStar Corrections
available
from
www.novatel.com/support/search/items/Application%20Note
l
the
Agriculture Commands and Logs Reference Manual
for log/command details
and/or
