lonewolf :
Also a big thank you to PJ2 for the analogy in re data sampling, although I did cringe at the memory of strobe lights and the disco era. (At least you didn't meantion leisure suits and polyester shirts!
)
For syseng68:
Quote:
Although messages may not be written in real time, or perhaps even in strict sequence of arrival is irrelevant, since each message will have it's own timestamp.
Good point.
I strongly suspect (but don't have doc's to qoute) that the data arrives at the black box at a much higher rate than it is recorded and that the recorded sampling rate is set by the black box.
What could be done to help with correlation is to snap-shot all the data at relevant frame boundries, to use PJ2's analogy synchronize the strobes. The data could then be saved over the frame time.
This would avoid artifacts such as phantom splits in control surfaces due to "sampling lag"
On the other hand there may actually be more value in sampling the data as it is recorded, helping to fill in gaps using semi-related parameters.
To put it in engineering terms "no matter how hard you try Nyquist wins". (And wagon wheels will continue to go backwards in movies)