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Opened 6 months ago

#21007 new enhancement

Import more data from NMEA GNSS tracks

Reported by: pyrog Owned by: team
Priority: normal Milestone:
Component: Core Version:
Keywords: Cc:

Description

With Real Time Kinematic (RTK) more NMEA fields could be stored for each nodes, and used e.g. for colorise the track.

  • The age in GGA message
  • The full satellite count (for all constellations) in GSA message
  • The standard deviation of horizontal error in GST message
  • The differential reference station ID in GGA

Currently JOSM display the satellite count for the GPS constellation only.

To obtain it, count the non empty SVID in the GSA sentence.
21 in the following example (SVID 12,25,29,31,32 76,84 02,24,12,36,07,08,11,25 30,36,26,29,13,35)

$GNGGA,070832.25,4634.4821410,N,00545.0846823,E,4,12,0.59,548.778,M,47.205,M,1.3,0000*60
$GNGSA,A,3,12,25,29,31,32,,,,,,,,1.09,0.59,0.92,1*02
$GNGSA,A,3,76,84,,,,,,,,,,,1.09,0.59,0.92,2*00
$GNGSA,A,3,02,24,12,36,07,08,11,25,,,,,1.09,0.59,0.92,3*06
$GNGSA,A,3,30,36,26,29,13,35,,,,,,,1.09,0.59,0.92,4*06

The standard deviation horizontal error is the maximum of the standard deviation of latitude error or standard deviation or longitude error.
In this exemple, the standard deviation horizontal error is 0.019 meter (1.9 cm)

$GNGST,070832.50,32,0.053,0.037,48,0.018,0.019,0.035*4A

Attachments (1)

SFE_Surveyor_210616_070432.nmea (62.5 KB) - added by pyrog 6 months ago.
Sample NMEA track in RTK

Download all attachments as: .zip

Change History (1)

Changed 6 months ago by pyrog

Sample NMEA track in RTK

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