Truck & Off-Highway Engineering - June 2021 - 7

TECHNICAL INNOVATIONS
other closed environments for some
time. But in other off-highway fields,
automated systems aid drivers but
don't replace them. In agriculture and
construction, sensing requirements are
often relatively short.
" We expect most of our challenges to
come in close range and involve signalblocking
structures like trees, silos and
storage sheds, " said Nancy Post, Director,
Intelligent Solutions Group at John Deere.
" As a result, our next-generation receivers
will have technology that mitigates most,
if not all, of the scintillation and interference
issues that are common today. "
Driving-related sensors on these vehicles
will often be relegated to secondary
status. Companies like Caterpillar
and Deere have their own satellite positioning
technologies.
" Our primary sensor is the satellite
navigation system, which typically
doesn't have the same issues with inclement
weather, " Post said. " During
short periods where it may be affected,
we can fuse the positioning information
for the additional sensors like inertial
navigation systems, camera and imaging
radar to bridge these gaps. "
On highways, reliability over the long
haul is an essential factor. Commercial
vehicles have demanding environmental
prerequisites that are challenging suppliers'
capabilities. Getting sensors that
can " see " far enough away to safeguard
vehicles that haul heavy cargo payloads
is not easy.
" Sensors' range is quite important for
some applications, and we are always
looking for sensors that are certified for
safety purposes, " said Luca Delgrossi,
head of technology, Volvo Autonomous
Solutions. " Today, there are a few certified
sensors and the distance they can
cover is still relatively short. Lidar's reliability
is one of the factors that determines
how fast we can drive under safe
conditions. Different sensors can handle
Sensors and satellite positioning inputs will
guide ag vehicles.
adverse weather conditions in different
ways. It is important to understand specific
sensors' limitations and avoid running
operations when the system cannot
operate safely. "
Terry Costlow
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Truck & Off-Highway Engineering - June 2021

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