Bombs in WWII used swept frequency transceivers to determine distance to gr=
ound.
The idea is that the return is time delayed, so the delta in frequency is p=
roportional to distance.

If they did it in 1940 with tubes and relays, I think we can do it now. :)


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 alan.b.pearce@stfc.ac.uk
Sent: Sunday, May 8, 2016 8:58 AM
To: piclist@mit.edu
Subject: RE: [EE] 24Ghz Doppler Gunnplexer Adjustment Screw?

> You only need a homodyne for speed.  If you can ramp the voltage=20
> quickly enough then you can get distance.  You cant have speed and=20
> distance at the same time.

To get distance I thought you needed pulsed transmissions and timed the del=
ay of the return pulse, but the gunnplexor modules only provided continuous=
 carrier - which is ideal for burglar alarms and the like.

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