Problems BerryGPS-IMU V3

[Rainer]

I read the GPS NMEA data directly from /dev/serial0 from our first IMU-3 device I get
$GNGGA instead of $GPGGA
and
$GNRMC instaed of $GPRMC
and
$GNGSA instaed of $GPGSA
the values are O.K.
I’m working only with this 3 records, but there are many other $GNxxx Records.

[Mark Williams]

Sorry for the late reply.

GP, means that you are only receiving GPS only

GN, means that you are receiving data from GPS and one other system (Beidou, Galileo or GLONASS)

 

If the output is GN*, this is better than GP*

 

Mark --OzzMaker.com --

[Rainer]

Thank you Mark,
Are these the only changes in the IMU V3 version?

[Mark Williams]

the IMU is the same between V2 and V3.

The GPS has changed.

In V2, the GPS didn’t support concurrent  GPS systems.  And the NMEA sentences started with GP

In v3, the GPS is much more advanced and it does support concurrent GPS systems, for a more accurate result.  NMEA sentences started with GN

In the NMEA sentences, everything after GP or GN is the same

I hope that clears it up

Mark --OzzMaker.com --

[Rainer]

Hello Mark,
will the new GPS receiver receive from all 4 satellite systems, if so, do I correctly read the Glonass statistics from $GLGSV ? And GPS + Galileo output their statistics together in $GPGSV? While the localization data from all systems is sent in $GNGGA and $GNRMC?
But no matter if my assignment is correct, with your ‘old’ receiver I get 10-12 satellites and now with the new 24-26. Congratulations !!!!
Best regards from Munich (first day after Oktober-Fest)

[Author]

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