your position is our focus
Example
Use on/off time
Enabled
T_on [s]
0
(=
one
valid
fix)
T_off [s]
86’400
(=24
hours)
Absolute align
Enabled
Base TOW [s]
43’200
(=12
hours)
T_acq [s]
60
(=1
minute)
T_acq_off [s]
120
(=2
minutes)
T_reacq [s]
5
T_reacq_off [s]
60
Operation
The
receiver
will
wake
up
once
a
day
at
12:00
GPS
and
perform
one
position
fix.
Table 17: Example settings FXN With On/Off Time and absolute Alignment
Note
If
T_on
is
set
to
0s,
the
receiver
will
enter
Off
State
as
soon
as
the
Position
Accuracy
is
below
the
P Accuracy Mask
(see
also
Section
4.6.8.1
).
For
an
improved
accuracy,
increase
T_on
by
a
few
seconds.
The
FixNOW™
(FXN)
screen
in
u-center
AE
software
holds
three
templates
(example
parameter
sets)
based
on
the
FixNOW™
Mode
(FXN),
providing
an
insight
to
the
capability
of
this
feature.
1.
Mobile Device Set
:
Setting
with
continuous
GPS
fixes
as
long
as
there
is
good
sky view,
but
low
power
settings therwise
(using
FXN without On/Off Time
).
2.
Asset Tracking Unit Set
:
Sleeping
unit
but
allows
position
information
on
request
(using
FXN with
rnally Controlled Power Management
Real
Time
Clock
Status
in
UBX
–
MON
(Status)
–
d
whether
the
internal
RTC
is
calibrated
or
not.
A
ANTARIS
®
4
GPS
Receivers
get
the
L1
band
signals
from
GPS
satellites
at
a
nominal
frequency
of
1575.42
MHz.
The
RF
signal
is
connected
to
the
RF_IN
pin.
ANTARIS
®
4
GPS
modules
can
be
connected
to
passive
or
active
antennas.
Note
For
ANTARIS
®
4
GPS
receivers
,
the
total
preamplifier
gain
(minus
cable
and
interconnect
losses)
must
not
exceed
50
dB.
Total
noise
figure
should
be
below
3
dB.
The
ANTARIS
®
4
Technology
supports
either
a
short
circuit
protection
of
the
active
antenna
or
an
active
antenna
supervisor
circuit
(open
and
short
circuit
detection).
For
further
information
refer
to
Section 4.3.2).
4.3.1 Passive
Antenna
nna
is
located
near
electronic
components;
therefore
care
should
be
taken
to
reduce
electrical
o
On/Off Time
).
3.
Schedule Fix Set
:
As
Asset
Tracking
Unit
but
with
position
information
aligned
to
a
fix
time
(using
FXN with On/Off Time and absolute Alignment
).
4.
User Set
:
Is
selected
as
soon
as
any
of
the
predefined
settings
are
changed
4.2.8 Exte
In
case
of
external
power
control,
it’s
necessary
to
monitor
the
HW
(Har ware
Status).
The
Real
Time
Clock
Status
indicates
calibrated
RTC
is
required
to
achieve
minimal
startup
time
(hot
start).
If
the
RTC
is
not
calibrated
the
receiver
would
typically
start
up
only
within
20-30
s
even
if
ephemeris
data
is
available.
4.3 Antenna and Antenna Supervisor
A
design
using
a
passive
antenna
requires
more
attention
regarding
the
layout
of
the
RF
section.
Typically
a
passive
ante
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Receiver
Description
GPS.G4-MS4-05007-A1
Page 72
