LTE-A Module Series
EG18 Hardware Design
EG18_Hardware_Design 70 / 104
4
GNSS Receiver
4.1. General Description
EG18 includes a fully integrated global navigation satellite system solution that supports Gen9HT-Lite of
Qualcomm (GPS, GLONASS, BeiDou, Galileo and QZSS).
EG18 supports standard NMEA-0183 protocol, and outputs NMEA sentences at 1Hz data update rate via
USB interface by default.
By default, EG18 GNSS engine is switched off. It has to be switched on via AT command. For more
details about GNSS engine technology and configurations, please refer to
document [4]
.
4.2. GNSS Performance
The following table shows GNSS performance of EG18.
Table 31: GNSS Performance
Parameter
Description
Conditions
Typ.
Unit
Sensitivity
(GNSS)
Cold start
Autonomous
-147
dBm
Reacquisition
Autonomous
-159
dBm
Tracking
Autonomous
-159
dBm
TTFF
(GNSS)
Cold start
@open sky
Autonomous
35
s
XTRA enabled
18
s
Warm start
@open sky
Autonomous
30
s
XTRA enabled
2.5
s