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NOTES
1.
Keep the characteristic impedance for the trace of GNSS antenna
π-type
2.
Place the
matching components as close to the antenna as possible.
3.
Keep the digital circuits, such as that of (U)SIM card, USB interface, camera module, display
connector and SD card, away from the antenna traces.
4.
Keep 75 dB isolation between each antenna trace.
5.
Keep 15 dB isolation between each antenna to improve the receiving sensitivity. and 20 dB isolation
between 5G NR UL MIMO
5.2.3. GNSS Performance
The following table shows GNSS performance of RM502Q-GL series module.
Table 36: GNSS Performance
Parameter
Description
Cold start
Sensitivity
Reacquisition
(GNSS)
Tracking
Cold start
@ open sky
TTFF
Warm start
(GNSS)
@ open sky
Hot start
@ open sky
Accuracy
CEP-50
(GNSS)
NOTES
1.
Tracking sensitivity: the minimum GNSS signal power at which the module can maintain locked (keep
positioning for at least 3 minutes continuously).
2.
Reacquisition sensitivity: the minimum GNSS signal power required for the module to maintain
RM502Q-GL_Hardware_Design
TRX0 and TRX1
antennas.
Conditions
Autonomous
Autonomous
Autonomous
Autonomous
XTRA enabled
Autonomous
XTRA enabled
Autonomous
XTRA enabled
Autonomous
@ open sky
5G Module Series
RM502Q-GL Hardware Design
to 50 Ω.
(ANT2_GNSSL1)
Typ.
-145
-157
-157
177
14
140
2
50
1.5
2.6
Unit
dBm
dBm
dBm
s
s
s
s
s
s
m
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