On 6/5/12 5:20 PM, Tom Van Baak wrote:
Attached are two snapshots of a NASA live feed -- an interesting reminder about
the difficulty measuring timing signals with great precision.
When you look closely, the leading edge of the sun is rather ill-defined, not
unlike many 1PPS pulses. I suppose with enough photos, modeling, and image
processing one could pinpoint when the transit (zero crossing) really occurs to
great precision. Does anyone know more details how this is done? Is the
state-of-the-art at the millisecond level? microsecond? nanosecond?
Thanks,
/tvb
or do something like compare the "centroid" of venus to "centroid +
radius" of sun (or segment thereof.. )
it's pretty easy to get 0.1 pixel centroid precision, from what the star
tracker, tiny moon finder folks tell me.
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