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Question regarding GPS sentence formats


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tmn_pilot
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Hi Skydemon.

I have a question regarding the format of GPS NMEA sentences used in Skydemon.

If I connect my 10 years old GPS receiver to Skydemon thru Wifi "Use PilotAware", it connects instantly.

However if I try to use my new GPS receiver, it will not connect.

I suspect that the issue is related to the "new" NMEA identifiers, like $GPRMC in the new receiver is named $GNRMC etc. Think it is because the receiver support GNSS.

Here is a log of NMEA from the new receiver:
2022-04-28 20:54:47.562 32328-32363/com.example.nmealog D/NMEA: $GNRMC,185448.00,A,5623.354200,N,00953.665973,E,0.0,,280422,0.2,W,A,V*60
2022-04-28 20:54:47.563 32328-32363/com.example.nmealog D/NMEA: $GNGNS,185448.00,5623.354200,N,00953.665973,E,AAANNN,21,0.6,12.9,43.6,,,V*12
2022-04-28 20:54:47.564 32328-32363/com.example.nmealog D/NMEA: $GNGGA,185448.00,5623.354200,N,00953.665973,E,1,12,0.6,12.9,M,43.6,M,,*4D
2022-04-28 20:54:48.523 32328-32363/com.example.nmealog D/NMEA: $GPGSV,3,1,11,01,85,223,21,03,48,239,14,08,14,177,33,14,11,267,22,1*62
2022-04-28 20:54:48.527 32328-32363/com.example.nmealog D/NMEA: $GPGSV,3,2,11,17,33,307,22,19,14,319,25,21,59,130,27,22,47,081,32,1*65
2022-04-28 20:54:48.542 32328-32363/com.example.nmealog D/NMEA: $GPGSV,3,3,11,31,04,105,19,32,35,056,25,04,03,188,,1*5B
2022-04-28 20:54:48.544 32328-32363/com.example.nmealog D/NMEA: $GLGSV,2,1,07,86,16,139,22,79,14,327,15,65,30,208,13,88,47,310,16,1*79
2022-04-28 20:54:48.550 32328-32363/com.example.nmealog D/NMEA: $GLGSV,2,2,07,87,80,158,13,71,40,045,33,72,77,153,16,1*40
2022-04-28 20:54:48.554 32328-32363/com.example.nmealog D/NMEA: $GAGSV,2,1,08,03,50,156,29,05,45,067,29,08,10,194,29,09,05,035,17,7*7B
2022-04-28 20:54:48.559 32328-32363/com.example.nmealog D/NMEA: $GAGSV,2,2,08,13,34,295,24,15,83,206,24,21,12,292,25,01,12,340,,7*70
2022-04-28 20:54:48.565 32328-32363/com.example.nmealog D/NMEA: $GNGSA,A,3,01,08,14,17,19,21,22,31,32,,,,0.8,0.6,0.6,1*3B
2022-04-28 20:54:48.568 32328-32363/com.example.nmealog D/NMEA: $GNGSA,A,3,71,79,86,87,88,,,,,,,,0.8,0.6,0.6,2*33
2022-04-28 20:54:48.569 32328-32363/com.example.nmealog D/NMEA: $GNGSA,A,3,03,05,08,09,13,15,21,,,,,,0.8,0.6,0.6,3*39
2022-04-28 20:54:48.570 32328-32363/com.example.nmealog D/NMEA: $GNVTG,,T,,M,0.0,N,0.0,K,A*3D
2022-04-28 20:54:48.571 32328-32363/com.example.nmealog D/NMEA: $GNDTM,P90,,0000.000024,S,00000.000000,E,0.969,W84*5E
2022-04-28 20:54:48.572 32328-32363/com.example.nmealog D/NMEA: $GNRMC,185449.00,A,5623.354200,N,00953.665970,E,0.0,,280422,0.2,W,A,V*62

All sentences have correct checksum.
Is there a solution to this, or do I have to keep using "old" GPS receivers?

Best regards
Thomas


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tmn_pilot - 4/28/2022 7:21:13 PM
Hi Skydemon.

I have a question regarding the format of GPS NMEA sentences used in Skydemon.

If I connect my 10 years old GPS receiver to Skydemon thru Wifi "Use PilotAware", it connects instantly.

However if I try to use my new GPS receiver, it will not connect.

I suspect that the issue is related to the "new" NMEA identifiers, like $GPRMC in the new receiver is named $GNRMC etc. Think it is because the receiver support GNSS.

Here is a log of NMEA from the new receiver:
2022-04-28 20:54:47.562 32328-32363/com.example.nmealog D/NMEA: $GNRMC,185448.00,A,5623.354200,N,00953.665973,E,0.0,,280422,0.2,W,A,V*60
2022-04-28 20:54:47.563 32328-32363/com.example.nmealog D/NMEA: $GNGNS,185448.00,5623.354200,N,00953.665973,E,AAANNN,21,0.6,12.9,43.6,,,V*12
2022-04-28 20:54:47.564 32328-32363/com.example.nmealog D/NMEA: $GNGGA,185448.00,5623.354200,N,00953.665973,E,1,12,0.6,12.9,M,43.6,M,,*4D
2022-04-28 20:54:48.523 32328-32363/com.example.nmealog D/NMEA: $GPGSV,3,1,11,01,85,223,21,03,48,239,14,08,14,177,33,14,11,267,22,1*62
2022-04-28 20:54:48.527 32328-32363/com.example.nmealog D/NMEA: $GPGSV,3,2,11,17,33,307,22,19,14,319,25,21,59,130,27,22,47,081,32,1*65
2022-04-28 20:54:48.542 32328-32363/com.example.nmealog D/NMEA: $GPGSV,3,3,11,31,04,105,19,32,35,056,25,04,03,188,,1*5B
2022-04-28 20:54:48.544 32328-32363/com.example.nmealog D/NMEA: $GLGSV,2,1,07,86,16,139,22,79,14,327,15,65,30,208,13,88,47,310,16,1*79
2022-04-28 20:54:48.550 32328-32363/com.example.nmealog D/NMEA: $GLGSV,2,2,07,87,80,158,13,71,40,045,33,72,77,153,16,1*40
2022-04-28 20:54:48.554 32328-32363/com.example.nmealog D/NMEA: $GAGSV,2,1,08,03,50,156,29,05,45,067,29,08,10,194,29,09,05,035,17,7*7B
2022-04-28 20:54:48.559 32328-32363/com.example.nmealog D/NMEA: $GAGSV,2,2,08,13,34,295,24,15,83,206,24,21,12,292,25,01,12,340,,7*70
2022-04-28 20:54:48.565 32328-32363/com.example.nmealog D/NMEA: $GNGSA,A,3,01,08,14,17,19,21,22,31,32,,,,0.8,0.6,0.6,1*3B
2022-04-28 20:54:48.568 32328-32363/com.example.nmealog D/NMEA: $GNGSA,A,3,71,79,86,87,88,,,,,,,,0.8,0.6,0.6,2*33
2022-04-28 20:54:48.569 32328-32363/com.example.nmealog D/NMEA: $GNGSA,A,3,03,05,08,09,13,15,21,,,,,,0.8,0.6,0.6,3*39
2022-04-28 20:54:48.570 32328-32363/com.example.nmealog D/NMEA: $GNVTG,,T,,M,0.0,N,0.0,K,A*3D
2022-04-28 20:54:48.571 32328-32363/com.example.nmealog D/NMEA: $GNDTM,P90,,0000.000024,S,00000.000000,E,0.969,W84*5E
2022-04-28 20:54:48.572 32328-32363/com.example.nmealog D/NMEA: $GNRMC,185449.00,A,5623.354200,N,00953.665970,E,0.0,,280422,0.2,W,A,V*62

All sentences have correct checksum.
Is there a solution to this, or do I have to keep using "old" GPS receivers?

Best regards
Thomas


Just a quick thought: some GPS can be configured so that even in case of GNSS $GPRMC is sent. The configuration parameter is called "Talker ID" which needs to be set to "GPS".

Tim Dawson
Tim Dawson
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The GPS sentence decoding in SkyDemon is designed for older (traditional) GPS receivers. Modern phones, tablets etc do this decoding themselves and pass them to SkyDemon through Location Services.
tmn_pilot
t
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Tim Dawson - 5/3/2022 10:17:35 AM
The GPS sentence decoding in SkyDemon is designed for older (traditional) GPS receivers. Modern phones, tablets etc do this decoding themselves and pass them to SkyDemon through Location Services.


Hi Tim

Thx for clarifying.

I'll look for a compatible GPS receiver for now.

Any chance you'll update the GPS decoding in the future?

Best regards

Thomas



Tim Dawson
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I can't foresee a situation where we'd get much demand for it, but if we do, then we would do the work.
GO

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