On Sep 2, 2009, at 10:28 AM, MEIERLE Mike wrote:
> I didn't say it wouldn't work, your synchronization idea was to use
> GPS,
> Public GPS isn't accurate enough for our application, the military
> purposely vary's the signal to thwart our enemies, you have to have
> the
> correction frequency to get the precision military signal. And It's
> just
> more expensive. Think about when someone hits a timing light on the
> track, now they're hitting a expensive sensor. The SCTA is happy with
> what they have and have it worked out. The discussion is with them.
>
> Mike M.
Ah-HA! No, I surely did NOT mean to suggest GPS system, nor to imply
that it would work. I imagine a timing clock running here at a
central location on the Salt -- say, the timing tower - sending the
clock signal to the various individual sensors. And since the
individual stations are in fixed locations - it should be doable to
correct for delay in receiving the clock signals within a few minutes
of system initialisation. Once that's done -- no changes, no delays
to consider. Each clock/sensor would send a packet saying "I had
something happen (someone broke through the light beam) at such-and-
such a time", and that time would be used with the other event times
to compute time between entrance and departure of the timed stretch.
That's what I meant to say, at least. Thanks for letting me know what
it seems I said, Mike.
Radios are down out here at Bub's by the way -- everything is on
hold. Bub is pre-staged at the south end of the international course,
Sam Wheeler is reported on the way out here with the 999 liner to get
in line. Wind is about 4-7 mph down course -- nobody running right now.
Jon
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