LTE Module Series
EP06&EG06&EM06 GNSS AT Commands Manual
EP06&EG06&EM06_GNSS_AT_Commands_Manual
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1.2. NMEA Sentences Type
The NMEA sentences are compatible with NMEA-0183 Protocol, and all of the standard NMEA sentences
have four kinds of prefix, as illustrated below.
For GPS sentences
, the prefix is “GP”, as below:
GPGGA - Global positioning system fix data, such as time, position, etc.
GPRMC - Recommended minimum data
GPGSV - Detailed satellite data
GPGSA - Overall satellite data
GPVTG - Vector track and speed over the ground
For GLONASS sentences, the prefixes are "GL" and "GN", as below:
GLGSV - Detailed satellite data
GNGSA - Overall satellite data
GNGNS - Positioning system
For Galileo sentences, the prefixes are "GA" and "GN", as below:
GAGSV - Detailed satellite data
GNGSA - Overall satellite data
GNGNS - Positioning system
For BeiDou sentences, the prefix is "PQ", as below:
PQGSV - Detailed satellite data
PQGSA - Overall satellite data
1.3. Introduction of gpsOneXTRA Assistance
gpsOneXTRA Assistance technology enhances the performance of GNSS, and provides simplified GNSS
assistance delivery, including ephemeris, almanac, ionosphere, UTC, health and coarse time assistance
for GNSS engine. After activating gpsOneXTRA Assistance, the TTFF (Time to First Fix) can be reduced
by 18s~30s (or more in harsh environments with weak signals). The assistance data which is obtained
from one of the gpsOneXTRA Assistance web servers on the network needs to be updated once a day (or
every couple of days).
Before using this function, customers need to ensure that the valid gpsOneXTRA assistance data is
available first. They need to download a new gpsOneXTRA binary file which contains the data from one of
the gpsOneXTRA Assistance web servers via URLs listed below. The files named as
xtra2.bin
are for
GPS+GLONASS and the files named as
xtra3grc.bin
are for GPS+BeiDou. The exact file
