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From: Archimedes Plutonium on 4 Jun 2010 01:26


Enrico wrote:

>
> http://www.copradar.com/preview/chapt2/ch2d1.html
>
> Police traffic radar emits an unmodulated continuous wave (CW) and
> measures' reflections (echoes). Reflections are frequency shifted
> (Doppler shift) if the target is moving; the faster the target is
> traveling, the more the frequency shifts. A target traveling toward
> the radar shifts the frequency higher while a target traveling away
> from the radar shifts the frequency lower (compared to transmit
> frequency). The radar, by design, simultaneously transmits a
> continuous signal while receiving continuous signal echoes.
>
>
> Enrico

Enrico, it is an unfortunate use of the words "Doppler shift" because
the
radar is not measuring a doppler shift. The radar is giving you back
"echoes"
of distance 1 and time 1 then it gives you distance 2 and time 2, all
at the
speed of light. The calculation is then, making use of d_1, t_1 and
d_2, t_2.

Somehow, somewhere, novices are throwing in the words "Doppler shift"
when
they never should be throwing in such.

And I see that Wikipedia on some of its Doppler pages is erroneous on
this
physics also.

So this is what happens when you have a culture of fake physics of a
Doppler
shift.

Enrico, do you actually believe that the radar is "picking up a
Doppler shift of the
radar wave?"

When I was in the Navy, we routinely did Maneuvering Boards or Mo
Boards of radar
on distant ships to tell their speed and direction of motion. Enrico,
do you actually
believe that we were doing a Doppler shift on a distant ship?

This is what happens when fakeness enters physics, in that it seems to
spread
into other corridors and avenues and pollutes the minds of students of
physics.

Archimedes Plutonium
http://www.iw.net/~a_plutonium/
whole entire Universe is just one big atom
where dots of the electron-dot-cloud are galaxies
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