AMY-5M
-
Hardware
Integration
Manual
Objective
Specification
Product
Testing
GPS.G5-MS5-08207
u-blox
proprietary
Page 41
your position is our focus
4 Product Testing
4.1 Test Parameters for OEM Manufacturer
Because
of
the
testing
done
by
u-blox
(with
100%
coverage),
it
is
obvious
that
an
OEM
manufacturer
doesn’t
need
to
repeat
firmware
tests
or
measurements
of
the
GPS
parameters/characteristics
(e.g.
TTFF)
in
their
production
test.
An
OEM
Manufacturer
should
focus
on
•
Overall
sensitivity
of
the
device
(including
antenna,
if
applicable)
•
Communication
to
a
host
controller
4.2 System Sensitivity Test
The
best
way
to
test
the
sensitivity
of
a
GPS
device
is
with
the
use
of
a
1-channel
GPS
simulator.
It
assures
reliable
and
constant
signals
at
every
measurement.
Figure 25: 1-channel GPS simulator
u-blox
recommends
the
following
Single-Channel
GPS
Simulator:
•
Spirent
GSS6100
Spirent
Communications
Positioning
Technology
(previously
GSS
Global
Simulation
Systems)
1
www.positioningtechnology.co.uk
4.2.1 Guidelines for Sensitivity Tests
1.
Connect
a
1-channel
GPS
simulator
to
the
OEM
product
2.
Choose
the
power
level
in
a
way
that
the
“Golden
Device”
would
report
a
C/No
ratio
of
38-40
dBHz
3.
Power
up
the
DUT
(Device
Under
Test)
and
allow
enough
time
for
the
acquisition
4.
Read
the
C/No
value
from
the
NMEA
GSV
or
the
UBX-NAV-SVINFO
message
(e.g.
with
u-center
AE)
5.
Compare
the
results
to
a
“Golden
Device”
or
a
u-blox
5
Evaluation
Kit.
