Chapter 3 SMART7 Operation
SMART7 Installation and Operation User Manual v6
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The SMART Antenna is shipped from the factory with the height set to 0.0 meters.
For more information, refer to the
$PMDT
command.
Changes in tire pressure over time can potentially cause errors in Terrain Compensation. This is
because the height of vehicle can vary with tire pressure.
Leveling the Terrain Compensation Sensor
The vehicle must be parked on flat ground when the level command is sent to the SMART Antenna.
To level the Terrain Compensation sensor, enter the following command:
$PMDT,l*4D
For more information, refer to the
$PMDT
command.
Saving the Terrain Compensation Configuration
After the height has been set or the Terrain Compensation sensor has leveled, the Terrain Compensation con-
figuration must be saved. This is done so the height data and level setting are saved between power cycles. To
save Terrain Compensation configuration, enter the following command:
$PMDT,x*59
For more information, refer to the
$PMDT
command.
3.11 SMART Antenna Emulated Radar
3.11.1 Emulated Radar (ER)
A typical radar sensor emits radio beams that bounce off the ground and computes ground speed based on the
speed at which objects are passing in front of the sensor. The output of the sensor is a digital pulse, the fre-
quency of which is proportional to the vehicle’s ground speed. This is often used in agricultural applications such
as planting and spraying. The SMART Antenna eliminates the need for separate ground-sensing radar equipment
by converting the GPS-derived velocity to a proportional frequency output. The following emulated radar signal
parameters can be configured by the customer:
l
Frequency Step: Specifies how the frequency output relates to the vehicle speed.
l
Signal Update Rate: Specifies how often the frequency output is updated to match the vehicle speed.
l
Response Mode: Specifies how quickly changes in velocity are reflected in the frequency output. Setting a
slower response mode reduces spikes (noise) in the velocity but increases latency. Setting a higher
response mode reduces latency, but may result in noisier frequency output.
Refer to
RADARCONFIG
command for detailed information.
After it is configured using the
RADARCONFIG
command, Emulated Radar (ER) pulses are output through the
SMART Antenna interface cable and the
RADARSTATUS
log.
3.12 Logging Using NovAtel Connect
NovAtel Connect is a computer program used to configure and monitor NovAtel receivers.
The Logging Control Window in NovAtel Connect provides an interface to configure logging and to collect logs
from the receiver. The collected logs can be output to one of the receiver communication ports or stored on the
computer running NovAtel Connect.