Logged GPS time not corresponding to Arducopter documentation

🧪 Flight Testing & Log Analysis
1

Hello,

I am working on data logs to extract date and time from GPS. As detailled in documentation.

log file sample :

GPS, 38636931, 3, 317964000, 1935, 6, 1.50, ##.9243595, ##.3516939, 8.01, 33.84158, 170.6295, -14.91, 1

GPS, 38836972, 3, 317964200, 1935, 6, 1.50, ##.9242253, ##.351733, 4.56, 39.93457, 171.8374, -16.09, 1

GPS, 39037111, 3, 317964400, 1935, 6, 1.50, ##.9241255, ##.3517583, 2.19, 37.05077, 169.7546, -9.95, 1

Corresponding headers should be (regarding doc) :

GPS, logID (?), Status, Time, (?), Nsats, HDop, Lat, Lng, RelAlt, Alt, (?), (?), GCrs (?)

317964000 → Tuesday, January 29, 1980 3:20:00 AM
Although log file has been written 2 weeks ago. Could someone know what epoch has been choosen for Time ?

Matt

2

I have found that line in the begining of logfile explaining GPS headers

FMT, 130, 46, GPS, QBIHBcLLefffB, TimeUS,Status,GMS,GWk,NSats,HDop,Lat,Lng,Alt,Spd,GCrs,VZ,U

But I still don’t understand the meaning of TimeUS nor GMS (which are not corresponding to epoch time) and how to get readable date time.

3

This Forum deals with the PX4 FlightStack (Firmware) whereas you refer to Arducopter Specifics, which is another Flightstack.