Gnss; Antenna Interface And Frequency Bands - Quectel EC21 Series Hardware Design

4.2. GNSS

4.2.1. Antenna Interface and Frequency Bands

EC21 series includes a fully integrated global navigation satellite system solution that supports GPS,
GLONASS, BeiDou (COMPASS), Galileo and QZSS.
EC21 series supports standard NMEA-0183 protocol, and outputs NMEA sentences at 1 Hz data update
rate via USB interface by default.
By default, EC21 series GNSS engine is switched off. It has to be switched on via AT command. For
more details about GNSS engine technology and configurations, see document [5].
The following tables show the pin definition and frequency specification of GNSS antenna interface.
Table 38: Pin Definition of GNSS Antenna Interface
Pin Name Pin No.
ANT_GNSS 47
Table 39: GNSS Frequency
Type
GPS
GLONASS
Galileo
BeiDou (COMPASS)
QZSS
EC21_Series_Hardware_Design
I/O Description
AI GNSS antenna
Frequency
1575.42 ±1.023
1597.5–1605.8
1575.42 ±2.046
1561.098 ±2.046
1575.42
LTE Standard Module Series
Comment
50 Ω impedance.
If unused, keep it open.
Unit
MHz
MHz
MHz
MHz
MHz
78 / 118