TargetTalk

Just wondering in general how a SCATT system determines the position at which the system is aimed ?
And how can it achieve sub 1mm resolution.
Joe.

4 IR LEDS are positioned on the target at the 12, 3, 6, 9 o'clock positions
about 150mm from the 10m target. A small telescope is fastened on the rifle,
pistol, cross bow, or bow. We'll talk about rifles here. It sits just under
the barrel and points towards the target. The guts of the system is a photo
detector in the telescope that is divided into 4 quadrants, If you look
carefully down into the lens you will see the detector is a circle divided
into quarters 12 to 6 and 3 to 9. By carefully aligning the telescope to the
target and using the Scatt software you can then align the system at the
target. The LEDs are focused onto the detector so that if the telescope was
exactly aimed the LEDS would focus onto the 12, 3, 6 9 positions right over
the edges of the quartered detector. Now if you imagine the rifle being
exactly lined up then moved sideways a fraction, the top and bottom
quadrants would change, say the left top gets less and the right top gets
more, left bottom would get less and the right bottom would get more. If it
was a movement horizontally that is. The electronics can be - (I'm not sure
if they do this - this is my guess and the way I would set it up) - set up
so that two opposing quadrants are fed to one amplifier and the other
opposing sent to another. This will enable software to figure out which way
the rifle has moved. This signal can be read and then displayed on the
screen. Very simple explanation.