your position is our focus
3.6 Layout
GPS
signals
at
the
surface
of
the
Earth
are
about
15dB
below
the
thermal
noise
floor.
Signal
loss
at
the
antenna
and
the
RF
connection
must
be
minimized
as
much
as
possible.
When
defining
a
GPS
receiver
layout,
the
placement
of
the
antenna
with
respect
to
the
receiver,
as
well
as
grounding,
shielding
and
jamming
from
other
digital
devices
are
crucial
issues
and
need
to
be
considered
very
carefully.
3.6.1 Footprint
This
section
provides
important
information
enabling
the
design
of
a
reliable
and
sensitive
GPS
system.
TIM modules
LEA modules
25.4
±
0.1
mm
[1000
±
4
mil]
25
.4
±
0.
1
mm
[1
0
0
0
±
4
mil
]
1.9
mm
[75
mil]
2.8
mm
[110
mil]
1.277
mm
[50.27
mil]
1.5
mm
[59
mil]
0.8
mm
[32
mil]
1.0mm
[39
mil]
0.8
mm
[32
mil]
1.0mm
[39
mil]
0.8
mm
[32
mil]
17.0
mm
[669
mil]
22.
4
mm
[8
81.
9
mi
l]
1.0
mm
[39mil]
0.8
mm
[32mil]
2.45
mm
[95.6mil]
1.1
mm
[43mil]
3.0
mm
[117mil]
2.15
mm
[83.2
mil]
0.8
mm
[32mil]
NEO modules
12.2
mm
[480.3
mil]
1
6
.0
m
m
[6
3
0
m
il]
0.9
mm
[35
mil]
0.8
mm[32
mil]
0.8
mm
[32
mil]
3.0
mm
[117
mil]
1.0
mm
[39
mil]
1.1
mm
[42.9
mil]
Figure 40: Recomm
d footprint
ende
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Design-In
GPS.G4-MS4-05007-A1
Page 52
