"John Larkin" wrote in
message

No. The oscillator runs at constant frequency and amplitude. Weak RF
reflections from the target are mixed with the transmit signal. Since
the echoes are a different frequency from the transmitted signal, a
doppler beat frequency results; it can be amplified and used to fire
the thyratron.

Isn't it more accurate to say that the echo has a different phase? The
frequency isn't that different because the speed is a small fraction of c.

If that's so then it isn't exactly the Doppler effect at all, but an
interference pattern - a different phenomenon.


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