L
hard
to
control
impedance
of
ms
cable.
This
effect
is
indeed
beneficial
if
the
antenna
cable
between
the
antenna
and
case,
there’s
no
need
f
10-15
dB.
In
this
en
e
imped
amplification.
1.5.9 Antenna
Placement
Where
the
antenna
is
mounted
is
crucial
for
optimal
performance
of
the
GPS
receiver.
When
using
patch
antennas,
the
antenna
plane
should
be
parallel
to
the
geographic
horizon.
The
antenna
must
have
full
view
of
the
sky
ensuring
a
direct
line-of-sight
with
as
many
visible
satellites
as
possible.
NA
can
help
to
match
the
the
antenna
to
a
50
Oh
the
receiver
is
only
short.
In
this
or
the
gain
of
the
LNA
to
exceed
ance
matching
and
not
signal
vironment
the
sole
purpose
of
the
LNA
is
to
provid
1
st
Choice Placement
2
nd
Choice Placement
Recommended
Antenna
positions
Perform
raded!
If
recommended
placements
are
not
available,
these
may
also
viable.
ance
may
be
deg
Note:
Window
and
roof
reduce
GPS
signal
and
obstruct
sky
view
Note:
There
may
be
multipath
signals
and
a
obstructed
sky
view
Note:
Fiberglass
airfoil
attenuates
the
GPS
signal
Table 1: Optimal antenna placement
1
Some
cars
have
a
metallic
coating
on
the
windscreens.
GPS
reception
may
not
be
possible
in
such
a
car
without
the
use
of
SuperSense
®
Technology.
There
is
usually
a
small
section,
typically
behind
the
rear
view
mirror,
reserved
for
mobile
phone
and
GPS
antennas.
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
GPS
Fundamentals
GPS.G4-MS4-05007-A1
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