> Ok, 200km/h is about 50m/s. Assuming the car goes in a straight line
> and just barely misses the receiver when it is closest, we have 30m.
> That is 0.6 second. A targetting device for keeping the beam on the
> receiver is probably impractical at that speed, so you would need a
> wide-angle beam. Anything less than the full 180 degrees is going to
> limit the time window even more. You will need a fairly strong beam.
> Definitely stronger than any infrared device I have seen.
This is well within the limits of say infrared headphones, but it's
certainly not an application for IrDA. IrDA is protocol based and
requires at least part time reliable communication. A better startgey
wuold be to stream out the data continuously from the car and have a
few detectors mounted arround the place or even one on a telescope
so that you could get telementry.
J.
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