On 1 Nov 2003 at 14:46, Dave Tweed wrote:

> Hopkins <rdhopkins@IHUG.CO.NZ> wrote:
> > Once read an article in Electronics Australia mag that showed how a guy
> > stopped ghosting on his TV by calculating the delay measured on his TV
> > screen between the true picture and the ghost picture and then converting
> > this delay into speed/distance he then put a circle around his location to
> > find the likely source of reflection - in his case a bridge.
>
> Either he got lucky, or you're misremembering. He should have drawn an
> ellipse, with the foci at the transmitter and receiver locations. A
> reflection from any point on the ellipse will have the same amount of
> extra path delay relative to the direct signal.
>
> This celldar idea is fascinating. Obviously, you can do quite a bit with
> a nondirectional receiving antenna and sufficient amounts of signal
> processing, but what if you also throw a directional (phased array?)
> antenna into the mix? Things could get very interesting...
>
> -- Dave Tweed

        I have read somewhere about a similar radar based on several
computers linked via Internet and comparing reflected radio waves
from FM stations.

        Mark

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