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nmea sentences

Posted by Napoleon on July 22, 2014 at 1:02pm

Hello,

I am planning to use a novatel oemv receiver as the GPS for my plane. I am using arduplane 2.78 and APM 2.5 

I know that ardupilot is happy even with nmea. The question is which $gp... Sentences are enough to be activated in order to do the job.

Thank you

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Tags: gps, nmea, sentences
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Replies

  • Napoleon November 22, 2014 at 12:03pm

    I am back i am also trying to pass the nmea data to apmplane 3.1 with no success. I have a novatel oemv2 l12 receiver. I configured the correct baud rate etc but no luck. I also enabled all the available nmea sentences through the great and very helpfull lefebure conf utility. It is strange as i configured an old lea-4t receiver to output nmea and it worked with the apmplane.....

    I will test again the next days and i will report.

    • Jason Spall > Napoleon November 24, 2014 at 4:48am
      Napoleon, can you post some of the NMEA strings of the LEA-4T?
      • Napoleon > Jason Spall November 25, 2014 at 12:15am

        08:11:10 $GPDTM,W84,,0.0,N,0.0,E,0.0,W84*6F
        08:11:10 $GPRMC,081110.00,A,3716.04386,N,02309.32730,E,0.020,251.41,251114,,,A*63
        08:11:10 $GPVTG,251.41,T,,M,0.020,N,0.037,K,A*38
        08:11:10 $GPGGA,081110.00,3716.04386,N,02309.32730,E,1,08,1.62,21.2,M,34.3,M,,*6A
        08:11:10 $GPGSA,A,3,29,15,22,16,18,19,21,27,,,,,2.73,1.62,2.21*0F
        08:11:10 $GPGSV,3,1,09,29,05,119,28,15,13,058,44,22,64,179,34,14,03,155,25*7E
        08:11:10 $GPGSV,3,2,09,16,57,248,39,18,62,072,46,19,23,308,37,21,44,055,42*79
        08:11:10 $GPGSV,3,3,09,27,52,318,35*4E
        08:11:10 $GPGLL,3716.04386,N,02309.32730,E,081110.00,A,A*67
        08:11:10 $GPGRS,081110.00,1,-2.3,-0.9,1.4,0.1,1.0,1.8,-0.3,,,,*6F
        08:11:10 $GPGST,081110.00,1.7,,,,2.0,1.5,3.0*73
        08:11:10 $GPZDA,081110.00,25,11,2014,00,00*6F

        samble of nmea output from my lea-4t

        • Orlando Tovar > Napoleon June 8, 2015 at 6:18am

          Hi Jason, All,

          I am writing because I've been experiencing similar issues. In particular, I am using the APM2.5 with GPS NMEA and it does not work with the latest version of the flight  controller firmware, it says “NO GPS”. However, the same GPS works fine with older versions of the firmware, e.g., before May 2014, it say “GPS: 3D Fix”.

          Jason or anyone else, have you solved the problems about the GPS with NMEA strings?

  • Jason Spall November 10, 2014 at 6:16pm

    I am now trying with a Novatel FlexPak6 (Leica GNSS have Novatel boards so it is the same messages anyway). 

    I have tried with GGA, RMC & VTG. I have read numerous different posts stating different message types so if anyone can give me a definitive answer would be appreciated.

    Baud set to 38400,N,8,1,N

    Wiring

    APM2.6 (Pins Right to Left) -> GNSS DB9 Male (Pin assignments from User Manual)

    Pin 1 (Red Wire) VCC - Not connected

    Pin 2 TX -> Pin 2 RX

    Pin 3 RX -> Pin 3 TX

    Pin 4 - Not connected

    Pin 5 GND -> DB9 Pin 5 GND

    Sample of the NMEA output


    $GPGGA,013115.00,2726.4607,S,15302.8319,E,4,18,0.6,14.01,M,41.20,M,01,4051*4C
    $GPRMC,013115.00,A,2726.4607171,S,15302.8318612,E,0.006,163.4,111114,0.0,E,D*28
    $GPVTG,163.425,T,163.425,M,0.006,N,0.012,K,D*23
    $GPGGA,013116.00,2726.4607,S,15302.8319,E,4,18,0.6,14.01,M,41.20,M,01,4051*4F
    $GPRMC,013116.00,A,2726.4607179,S,15302.8318612,E,0.004,134.5,111114,0.0,E,D*22
    $GPVTG,134.454,T,134.454,M,0.004,N,0.007,K,D*25
    $GPGGA,013117.00,2726.4607,S,15302.8319,E,4,18,0.6,14.01,M,41.20,M,01,4051*4E
    $GPRMC,013117.00,A,2726.4607183,S,15302.8318621,E,0.006,120.7,111114,0.0,E,D*23
    $GPVTG,120.705,T,120.705,M,0.006,N,0.012,K,D*23
    $GPGGA,013118.00,2726.4607,S,15302.8319,E,4,18,0.6,14.01,M,41.20,M,01,4051*41
    $GPRMC,013118.00,A,2726.4607191,S,15302.8318625,E,0.007,144.8,111114,0.0,E,D*27
    $GPVTG,144.832,T,144.832,M,0.007,N,0.014,K,D*24

    • Jason Spall > Jason Spall November 11, 2014 at 12:02am

      Could the precision of the data be the issue?

      I was looking at the output in the CLI and all I was getting was "............"

      I accidentally touched the RX/TX pins and then I got "NMEA Lat: 0, Lon 0, Alt: 0m, #sats: 0"  Whilst the pins touch, I get this repeatedly but as soon as they are not touching it goes back to dots across the screen.

      I tried it again with GGA, RMC, GSV, & GSA, same result.  I tested it with NMEAParser and all the data is there.3702531808?profile=original

       

  • Jason Spall November 8, 2014 at 3:21am
    John,

    ArduRover v2.46

    I have tried GP & GN. I can easily define this in my GNSS unit. I have also set my GNSS to GPS only. I will save some sample data and post it on Monday.

    Is there anyone in the Brisbane, Australia, region that would like to come around and give me a hand? I pay in Beer or Bourbon! :-)
  • Jason Spall November 6, 2014 at 2:17am
    I am keen to find out how to get this working. I am using a Leica GNSS receiver in a large rover project but I can't get it to read the nmea. I have it at 38400, sending GGA, GSV & GSA @ 5hz. I have checked the output with Putty and it all appears correctly but APM2.6 will not use it. I have set the GPS type to "5".
    • John Hutchison > Jason Spall November 6, 2014 at 7:38am

      Jason,

      What is the talker id in the messages? GP, GN, GL?

    • Matt Elias > Jason Spall November 6, 2014 at 6:22am

      Which version of firmware are you trying with? I know on Arducopter 3.2rc11 I can't use NMEA anymore.

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