BG96 GGA/RMC sentences

IoT Modules LPWA Module
1

Hi all,

I’m using BG96 module and I’m trying to understand if it supports GNGGA and GNRMC sentences in case GPS/GLONASS/GALILEO are contemporarily used.
I’m following “Quectel_BG96_GNSS_AT_Commands_Manual_V1.1.pdf” to configure NMEA type. What I see from NMEA output is that only GPGGA and GPRMC (i.e. GGA and RMC coming from GPS) are received.

FW version: BG96MAR02A07M1G_01.016.01.016

Thanks in advance,
Sabino

2

pls attached your at log ,

we need to know the all configure of you GNSS

image

3

Hi Stephen,

Our settings below:

  • “gpsnmeatype” --> 3, i.e. GGA+RMC
  • “glonassnmeatype” --> no setting, so default 0 (disabled)
  • “galileonmeatype” --> no setting, so default 0 (disabled)
  • “beidounmeatype” --> no setting, so default 0 (disabled)
  • “gsvextnmeatype” --> no setting, so default 0 (disabled)
  • “gnssconfig” --> no setting, so default 1 (GLONASS ON/BeiDou ON/Galileo ON)

Thanks,
Sabino

4

Thanks for your feedback 。

if you need to other satellites join to location ， pls enable the coresponding it also ， thanks.

5

Hi Stephen,

What I see from documentation is that, for example:

  • Galileo just supports GSV
  • Glonass just supports GSV, GSA, GNS

but none supports GGA and RMC, so I will never get combined GNGGA and GNRMC sentences from multiple constellations, isn’t it? I can receive GGA and RMC only from GPS satellites, right?

Regards,
Sabino

6

NO
for example ， if you want get combine GNGGA+GNRMC+GNVTG ， you can set as below

  1. AT+QGPSCFG=“gnssconfig”，4 // enable gps + g’lonass system

  2. AT+QGPSCFG=“gpsnmeatype”，20 //16+2=1 // 10011

7

Hi,

We added GNS Glonass sentence (AT+QGPSCFG=“glonassnmeatype”,4) and we now get GPGGA from GPS and GNGNS from Glonass. The former contains 9 satellites (from GPS constellation), the latter 14 satellites (from Glonass constellation), and both return the same position.
My question is: is there any configuration that allows to have one single NMEA sentence (e.g. GNGGA) that can combine info from GPS and Glonass satellites in order to increase the accuracy? Or should I do it by myself by parsing different sentences coming from separate satellites?

Thanks

8

pls print your result here .

The result you get is already the result of joint positioning. The module has its own unified algorithm to use the data of the two systems together

9

Here below an extract:

$GPGGA,122039.00,4018.049160,N,01808.483051,E,1,09,0.8,52.1,M,38.0,M,,*56
$GNGNS,122039.00,4018.049160,N,01808.483051,E,AAN,14,0.8,52.1,38.0,,*20

Moreover, here is also an extract of GSV sentences:

$GLGSV,3,1,09,66,23,233,33,86,48,104,29,77,33,305,21,76,57,022,50*62
$GLGSV,3,2,09,75,,,39,87,09,170,21,85,28,039,43,67,29,292,34*58
$GLGSV,3,3,09,68,07,338,22*5D
$GPGSV,3,1,12,02,15,132,29,06,18,094,38,12,62,286,50,13,08,164,19*73
$GPGSV,3,2,12,19,39,052,37,24,83,074,50,32,12,319,25,10,01,281,*74
$GPGSV,3,3,12,15,29,196,,17,20,040,,25,21,262,,39,,,35*45
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10

for BG96 module ， there is some print bug in NEMA output

this GPGGA is GNGGA actually

pls use this result directly , sorry for inconvenience .

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