your position is our focus
•
No GPS:
During
GPS
loss,
only
DR-
(sensor
based)
positions
are
reported.
The
position
is
calculated
based
on
the
signals
of
the
turn
rate
sensor
and
speed
sensor,
with
reference
to
the
last
known
GPS
solution.
•
Poor GPS:
In
urban
canyons
with
fast
changing
sky
visibility
or
during
degraded
GPS
reception,
the
ANTARIS
®
4
DR
Technology
performs
a
calculation
by
blending
the
GPS
and
sensor
based
positioning.
•
Good GPS:
With
good
GPS
performance
and
optimal
sky
view,
the
GPS
position
has
a
higher
weight
than
the
DR/sensor
based
position
on
the
overall
navigation
solution.
In
this
situation,
the
GPS
position
values
are
used
to
calibrate
the
DR
sensors
or
to
perform
sensor
integrity
checks
(to
establish
if
the
sensors
are
well
calibrated).
LEA-4R
/
TIM-4R
-
System
Integration
Manual
/
Reference
Design
Dead
Reckoning
Fundamentals
GPS.G4-MS4-05043
Page 9
