Specifications

Cinterion
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PLSx3 Hardware Interface Description
2.3 GNSS Antenna Interface
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2.3 GNSS Antenna Interface
2.3.1 GNSS Receiver
PLSx3 integrates a GNSS receiver that offers the full performance of GPS/GLONASS/BeiDou/
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. NMEA is a combined electrical
and data specification for communication between various (marine) electronic devices includ-
ing GNSS receivers. It has been defined and controlled by the US based National Marine Elec-
tronics 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. For more information see Section 2.3.4. 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 PLSx3 also has a GNSS antenna interface. See Section
2.1.1 to find out where the GNSS antenna pad is located. The GNSS pad’s shape is the same
as for the RF antenna interface (see Section 2.2.2).
It is possible to connect active or passive GNSS antennas. In either case they must have 50
Ω
impedance. The simultaneous operation of GSM/UMTS/LTE and GNSS is implemented. For
electrical characteristics see Section 2.2.