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GPMF STMP semantics #189
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I'm trying to add "as good as reasonably practical" TAI time stamping - eventually per frame, but for now on each (declared) sync sample. I'm using
GPS9
to derive millisecond precision time from day number and millis, adjusting for TAI offset, and then for the difference betweenCORI
andGPS9
values forSTMP
. So absolute accuracy is never greater than 1ms, but the frame-to-frame timing might be.Both
CORI
andGPS9
will repeat, and sinceGPS9
is not frame synchronous, they might not have the same number of entries in each GPMF chunk - the difference inSTMP
could potentially be positive or negative, depending on when the sampling happened.Questions:
Should
STMP
always be for the first item in the array?Is the
CORI
timestamp intended to represent "start of frame", "end of frame" or "sometime during the frame"? I'd like to represent start of frame, so potentially I can adjust using theSHUT
value, if needed.The text was updated successfully, but these errors were encountered: