[s-cars] ?? for List Physicists

[Joseph Pizzimenti]

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--- Kirby Smith <kirby.a.smith at verizon.net> wrote:
> Without making any statement about whether a
> particular device is great
> or a scam, let me answer the question posed.  To
> look slower than the
> actual case, the deceptive return pulses have to be
> delayed from the
> real pulse returns.  Further, the laser gun has to
> work on last pulse
> logic or else the real return will be preferred.  It
> is not difficult to
> generate repeater pulses with a calculated time
> delay using laser
> diodes.  Keep in mind that at 20 m/s, the rate of
> decreasing pulse
> return times is about 60 ns per second.  The device
> need only delay by a
> fraction of that to make the host vehicle look
> slower.  If such fast
> triggering were difficult (and the laser gun wasn't
> running
> pseudo-random pulsing), the device could pick up two
> pulses and
> calculate when to next respond.  Ideally, if the
> device knew one's
> speed, and the speed limit, it could make the
> vehicle look like it was
> going whatever speed one wanted relative to the
> speed limit.  This would
> be more difficult if the laser ping were from
> another moving car.
>
> The above applies to ladar operated as a ranging
> device, and not to
> coherent ladar operating from doppler directly.
>
> kirby
>

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