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Subject: Re: Radar basics?
Date: Wed, 16 Oct 2002 23:21:39 +0100
References: <3DAC82FB.F7066DE6@imit.kth.se> <email@example.com>
NNTP-Posting-Date: Wed, 16 Oct 2002 21:23:55 +0000 (UTC)
User-Agent: tin/1.4.2-20000205 ("Possession") (UNIX) (Linux/2.4.19 (i686))
Ken Taylor wrote:
> You could certainly receive the radar signal being directed toward you, but
> it would not mean anything - you wouldn't receive the signal of a target
> which happened to be illuminated at the time, and you certainly wouldn't
> receive such signals from any other direction (with any certainty about what
> was illuminating them, or when). Unless you got *really* clever and
> identified the RF signature of each transmitter.....(mind starts to boggle
> at the garage full of home-brew equipment at this stage!).
I am not sure about this, but it seems to me that as long as you are
reasonably close to the airport it may be doable...
The scheme would go something like this.
You use a recever with its aerial pointed at the airport to listen for the
beam scanning over your location, this gives you a reference for rotation
speed and also (as many pulses will be receved (at varying signal strength))
a timing reference for the transmitter. Lock one PLL onto the airport radars
scan speed and another onto its pulse rate (may need some kind of gating
Now you have information about where the airport transmitter is pointing
at any given time, you point your main aerial in the same direction, and
use the timebase derived from the pulse rate PLL to allow a display to be
Another interesting variation would be to try the same trick with marine
radar. This would allow a radar image to be generated without needing to
radiate from your ship.
Sounds like a nice little project to play with to me!
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