Specifications

Cinterion
®
EXS82-W Hardware Interface Overview
2.3 GNSS Interface
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 EXS82-W_HIO_v00.038 2019-12-27
Public / Preliminary
Page 23 of 44
2.3 GNSS Interface
2.3.1 GNSS Receiver
EXS82-W integrates a GNSS receiver that offers the full performance of GPS/GLONASS/Bei-
Dou/Galileo technology. The GNSS receiver is able to continuously track all satellites in view,
thus providing accurate satellite position data.
The integrated GNSS receiver supports the NMEA protocol via ASC0 interface. NMEA is a
combined electrical and data specification for communication between various (marine) elec-
tronic devices including GNSS receivers. It has been defined and controlled by the US based
National Marine Electronics Association. For more information on the NMEA Standard please
refer to http://www.nmea.org.
Depending on the receiver’s knowledge of last position, current time and ephemeris data, the
receiver’s startup time (i.e., TTFF = Time-To-First-Fix) may vary: If the receiver has no knowl-
edge of its last position or time, a startup takes considerably longer than if the receiver still has
knowledge of its last position, time and almanac or has still access to valid ephemeris data and
the precise time. Often, 2D measurements will be used over 3D depending on space vehicle
(SV) locations as this will be just as accurate and faster.
By default, the GNSS receiver is switched off. It has to be switched on and configured using
AT commands (AT^SGPSC; see [1]).
2.3.2 GNSS Antenna
In addition to the RF antenna interface EXS82-W also has a GNSS antenna interface. See Sec-
tion 2.1.1 to find out where the GNSS antenna pad is located. The GNSS installation is the
same as for the RF antenna interface - see Section 2.2.1.
It is possible to connect active or passive GNSS antennas. In either case the antennas must
have 50Ω impedance. The simultaneous operation of GSM/LTE and GNSS has been imple-
mented. Please note that the voltage for an active antenna has to be supplied by the external
application as shown in Figure 12.
Figure 12: Sample supply voltage circuit for active GNSS antenna
Active GNSS
Antenna
DC
GNSS
Receiver
Antenna
Matching
RF
DC
Active GNSS antenna power supply
(Voltage depends on antenna type )
GNSS_ANT
Module
Application
LNA
47p
10n