Performance of LC86L GNSS module

daniecreox · February 29, 2024, 6:34pm

Good day.

We have been using the LC86LICMD GPS module in a project since 2020. The project is to track a person’s movement.

We have recently purchased 550 units for a production run where we use these units.

We observed some strange behaviour on some of these 550 units – and would like to understand the issue. This is the first time that we experienced this issue…

The units return the following firmware codes:

$PMTK705,MT3333_AXN5.1.9_MODULE_STD_F9_P1,000B,Quectel-LC86LIC,1.033
$PMTK705,MT3333_AXN5.1.9_MODULE_STD_F1_P2,000B,Quectel-LC86LIC,1.038

Can you confirm whether this firmware is indeed the latest firmware, and if not, please supply the release notes for these 2 types of firmware?

Do you know of any issues with the above mentioned firmware?

Some of the issues that we observe is much longer than usual GPS fix times (up to 2 hours in some cases); inaccurate positioning data - data drifts; and also losing its GPS fix quite easily.

We think that the problem is firmware related, but it could be something else too.

Will appreciate your help and support!

carlitos18 · March 1, 2024, 1:39pm

Hello daniecreox,

maybe we can try to help by community, but are all of those 550 units showing the same exact issue?
Do you have any NMEA log file?

Regards
C

daniecreox · March 2, 2024, 6:32pm

Yes, all the units shows similar issue:

Would get a GPS fix one day, and then the next day in the same position it would not get a GPS fix. (We suspect that ephemeris data are not stored correctly in the RAM?)
Would eventually get a GPS fix, but could take up to 2 hours to get a fix.

Configuration:
Hardware - V_Bckp always powered. We remove Voltage from VCC to put units into Backup mode. And then use WAKE / FORCEON pin to switch unit back on when VCC reconnected.
UART - using 115200 baudrate, and set GPS to update rate of 10Hz
All other settings are at defaults - so should be using EASY by default, etc.

I do have plenty of log files that I can send - but when trying to upload I get a message saying that new users cannot upload attachments to this forum. Please confirm a method I can use to upload / send you the log files

daniecreox · March 5, 2024, 7:05am

Hello. Any updates on this please!

See below a sample log file indicating the long time it takes to obtain a GPS fix. I cannot upload attachments, so I am just pasting parts of the log as text into this message:

$PMTK705,MT3333_AXN5.1.9_MODULE_STD_F9_P1,000B,Quectel-LC86LIC,1.033
$GNRMC,213017.294,V,1.51,327.27,260224,N,V26
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,23,09,21,16,21,16D
$GLGSV,1,1,01,85,27,171
.
.
$GNRMC,213104.299,V,0.85,342.70,260224,N,V21
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,21,09,22,16,21,16C
$GLGSV,1,1,01,85,27,171
.
.
$GNRMC,213248.889,V,1.65,16.49,260224,N,V16
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,23,09,23,16,20,16E
$GLGSV,1,1,01,85,26,170
.
.
$GNRMC,213509.185,V,1.66,14.12,260224,N,V1E
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,23,09,22,16,22,16D
$GLGSV,1,1,01,85,24,172
.
.
$GNRMC,213708.791,V,2.20,22.73,260224,N,V1D
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213708.891,V,2.11,24.53,260224,N,V14
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213708.991,V,2.05,23.53,260224,N,V17
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.091,V,1.97,24.14,260224,N,V13
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.191,V,1.90,25.95,260224,N,V1D
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.291,V,1.86,12.90,260224,N,V18
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.391,V,1.84,8.19,260224,N,V21
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.491,V,1.83,5.11,260224,N,V24
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.591,V,1.79,5.42,260224,N,V26
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,22,16,20,168
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.691,V,1.76,14.57,260224,N,V1E
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,23,16,20,169
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.791,V,1.69,4.92,260224,N,V29
$GNGSA,A,1,11D
$GNGSA,A,1,21E
$GPGSV,1,1,03,27,24,09,23,16,20,169
$GLGSV,1,1,02,85,23,75,24,172
$GNRMC,213709.891,A,2552.810736,S,02809.404914,E,0.69,340.90,260224,A,V1C
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,24,177
$GNRMC,213710.000,A,2552.810709,S,02809.404856,E,0.60,308.77,260224,A,V13
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,24,177
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.100,A,2552.810677,S,02809.404816,E,0.52,296.64,260224,A,V1B
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,24,177
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.200,A,2552.810640,S,02809.404811,E,0.51,294.64,260224,A,V1A
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,24,177
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.300,A,2552.810601,S,02809.404806,E,0.49,290.89,260224,A,V16
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.400,A,2552.810562,S,02809.404797,E,0.48,285.99,260224,A,V14
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.500,A,2552.810526,S,02809.404819,E,0.45,284.30,260224,A,V13
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.600,A,2552.810497,S,02809.404835,E,0.44,285.68,260224,A,V18
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.700,A,2552.810464,S,02809.404849,E,0.43,286.08,260224,A,V1C
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.800,A,2552.810441,S,02809.404849,E,0.40,282.50,260224,A,V1E
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213710.900,A,2552.810444,S,02809.404837,E,0.38,277.69,260224,A,V1C
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.000,A,2552.810458,S,02809.404834,E,0.34,270.35,260224,A,V18
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.100,A,2552.810464,S,02809.404833,E,0.32,265.00,260224,A,V15
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,23,31,25,056,161
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.200,A,2552.810481,S,02809.404824,E,0.31,259.06,260224,A,V11
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,22,31,25,056,160
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,23,170
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.300,A,2552.810501,S,02809.404818,E,0.31,254.92,260224,A,V16
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,22,31,25,056,160
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,22,171
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.400,A,2552.810518,S,02809.404815,E,0.29,253.26,260224,A,V15
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,22,31,25,056,160
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,22,171
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.500,A,2552.810543,S,02809.404817,E,0.26,249.85,260224,A,V15
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,22,31,25,056,160
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,22,171
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.600,A,2552.810561,S,02809.404822,E,0.23,245.31,260224,A,V16
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,22,31,25,056,160
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,22,171
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.700,A,2552.810572,S,02809.404825,E,0.21,243.76,260224,A,V15
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,22,31,25,056,160
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,22,171
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.800,A,2552.810582,S,02809.404821,E,0.19,241.65,260224,A,V1A
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,20,09,35,254,22,31,25,056,160
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,22,171
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213711.900,A,2552.810594,S,02809.404818,E,0.17,236.62,260224,A,V1F
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,19,09,35,254,22,31,25,056,16A
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,22,171
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213712.000,A,2552.810605,S,02809.404812,E,0.15,232.82,260224,A,V1C
$GNGSA,A,3,27,09,16,1.74,1.44,0.98,108
$GNGSA,A,3,85,75,1.74,1.44,0.98,20F
$GPGSV,2,1,08,27,67,151,24,16,42,144,19,09,35,254,22,31,25,056,16A
$GPGSV,2,2,08,26,24,113,21,22,007,07,16,222,02,11,356,169
$GLGSV,2,1,07,85,52,028,23,84,44,127,74,40,132,75,33,203,22,171
$GLGSV,2,2,07,72,20,311,73,14,091,86,10,354,14F
$GNRMC,213712.100,A,2552.810616,S,02809.404806,E,0.14,227.29,260224,A,V1E
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