Hi gums,
Originally Posted by gums
The AoA traces show a fairly smooth increase, then we have what looks like a lotta noise. Could be electrical noise, could be effects from being on the bottom of the ocean for two years, but I cannot fathom the vanes/cones moving that much...
It is due to the effect of projecting this graph at this resolution.
What one would see, at a better resolution, is a pike [max-zero] each time the value of one probe is invalid (NCD: no computed data). It looks so "noisy" because the value of each probe is not sampled at the same time.
e.g. if the sampling rate of the recorder is 1 per second:
0.33 s - alpha 1
0.66 s - alpha 2
0.99 s - alpha 3
1.33 s - alpha 1
1.66 s - alpha 2
1.99 s - alpha 3
etc.
With a lot of NCDs, it will become unreadable pretty fast.