your position is our focus
4.6.7 Navigation Input Filters
T
ers
m
t
d
navigation
engine.
These
settings
are
optimized
already.
It
is
comm
ha
to
any
pa
rs
be
made
unless
advised
by
u-blox
support
engineers.
he
navigation
input
filt
ask
the
inpu
ata
of
the
not
re
ended
that
c
nges
ramete
Parameter
Description
Fix Mode
By
defaul
position
fix
if
possible
but
reverts
to
a
2D
positio
le
to
force
the
receiver
t
tly
calculate
2D
(
2D-only
)
or
3D
(
3D-only
)
positions.
t,
the
receiver
calculates
a
3D
n
if
necessary
(
Automatic 2D/3D
).
It’s
possib
o
permanen
Fix Altitude
Initial
alti
navigation
output
The
fix
altitude
is
used
if
Fix
Mode
is
s
in
case
of
a
2D
fix
after
a
Coldstart.
tude
used
for
2D
et
to
2D-only
or
Min SVs
Restricts
the
navigation
solution
to
be
calculated
with
at
least
n
satellites.
This
could
be
used
to
inhibit
a
solution
with
only
3
satellites.
Set
this
value
to
1
single
satellite
for
timing
applications
(LEA-4T
only).
Max SVs
Uses
at
most
‘n’
satellites
for
a
navigation
solution.
Initial Min SV
Minimum
number
of
satellites,
which
must
be
available
before
the
first
position
fix
will
be
calculated.
Min C/No
A
satellite
with
a
C/N0
below
this
limit
is
not
used
for
navigation.
Initial Min C/No
Minimum
C/N0
for
the
initial
fix.
Only
satellites
exceed
this
threshold
will
be
arameter
may
be
set
to
eve
a
higher
th
of
the
first
position
fix.
used
for
the
calculation
of
the
first
position
fix.
This
p
a
higher
value
than
"Min
C/No
(Nav)"
in
order
to
achi
confidence
in
e
accuracy
Min SV Elev
Minimum
eleva
e
horizon
in
order
to
be
used
in
the
navigation
solution.
Low
elevation
satellites
may
provide
degraded
accuracy,
ause
of
the
gh
the
atmosphere.
ation
tion
of
a
satellite
above
th
bec
long
signal
path
throu
DR (Dead Re
The
time
during
which
the
receiver
provides
an
extrapolated
solution.
After
the
DR
timeout
provided
at
all.
ckoning)
Timeout
has
expired
no
GPS
solution
is
Table 30: Naviga
n Input Filter parameters (UBX-CFG-N
4.6.8 Navigation Output Filters
tio
AV2)
Parameter
Description
PDOP Mask
P Accuracy Mask
The
PDOP
and
P
re
used
to
determine,
if
a
position
solution
is
marked
v d
EA
sentences
or
the
UBX
PosLimit
Flag
is
set.
A
solution
is
consider
lie
below
the
respective
limits.
osition
Accuracy
Mask
a
ali in
the
NM
ed
and
Accuracy
valid,
when
both
PDOP
TDOP Mask
y M
The
TDOP
and
Time
determine,
when
a
Time
e
should
be
e
TIMEPULSE
TDOP
or
the
time
accuracy
exceeds
its
pective
limit.
T Accurac
ask
Accuracy
Mask
are
used
to
Puls
allowed.
Th
is
disabled
if
either
res
Table 31: Navigation Output Filter parameter
10
Does
not
apply
to
DR
enabled
receivers
(like
TIM-LR)
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Receiver
Description
GPS.G4-MS4-05007-A1
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