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GPS and sometimes Magnetometer message timestamps reported 71 minutes ahead of system time. #52

@drk944

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@drk944

On my Ellipse-D I found that not all of the topics have the same timestep in the message header, differing by 4294 seconds. I compared timestamps of all the messages in a bag and the magnetometer and gps messages are recording their time 4294 seconds in the future ahead of every other SBG topic. This offset seems to be consistent across multiple bags I recorded from different days. The system device time is gps disciplined and accurate.

Here's the results showing the time difference of first and last imu messages compared to the timestamps of the mag and gps topics in a bag. Across all bags the time offset is pretty close to 4294.95 second difference.

Time offset between first mag and imu times:  4294.98229598999
Time offset between last mag and imu times:  4294.927295923233
Time offset between first gps and imu times:  4294.91729593277
Time offset between last gps and imu times:  4294.7822959423065

I've analyzed 5 bags so far and they all have this offset, except in two of the bags only the GPS topic is offset by 4294 seconds, the magnetometer timestamps line up with the rest of the data.

Do you have any idea what might be causing this? What information can I provide to aid in debugging? I'm hoping all my data isn't useless and I can update the timestamps with this calculated offset.

Thank you

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