LPWA Module Series
BG96 GNSS Application Note
BG96_GNSS_Application_Note 7 / 42
1.2. NMEA Sentences Type
The NMEA sentences are compliant with NMEA 0183 standard, and the standard NMEA sentences have
five kinds of prefix, as illustrated below.
For GPS sentences, the prefix is "GP", as below:
GPGGA
– Global positioning system fix data, such as time and position
GPRMC
– Recommended minimum specific GNSS data
GPGSV
– GNSS satellites in view, such as number of satellites in view and satellite ID numbers
GPGSA
– GNSS DOP and active satellites
GPVTG
– Course over ground and ground speed
For GLONASS sentences, the prefixes are "GL" and "GN", as below:
GLGSV
– GNSS satellites in view, such as number of satellites in view and satellite ID numbers
GNGSA
– GNSS DOP and active satellites
GNGNS
– GNSS fix data
For Galileo sentences, the prefixes are "GA" and "GN", as below:
GAGSV
– GNSS satellites in view, such as number of satellites in view and satellite ID numbers
GNGSA
– GNSS DOP and active satellites
GNGNS
– GNSS fix data
For BeiDou sentences, the prefix is "PQ", as below:
PQGSV
– GNSS satellites in view, such as number of satellites in view and satellite ID numbers
PQGSA
– GNSS DOP and active satellites
For QZSS sentences, the prefix is "PQ", as below:
PQGSA
– GNSS DOP and active satellites
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 18
–30 s (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).
