Pulse-Pair Method

1) The transmitter produces a pulse with frequency f₀ and duration of t.

2) Some power with frequency f₀ is mixed with a signal from STALO and is passed to COHO

3) COHO maintains f₀ of transmitted wave

4) Receiver/mixer mixes signal from STALO and received signal

5) Mixed signal is then amplified

6) Phases of original and received signals are differenced, i.e., compute f₁ = f₀ - f. This is the phase of pulse #1.

7) Repeat 1-6 above for successive pulses. This gives you df/dt.

Example of Doppler Velocities