I have a doubt about the working principle of a simple Radar.
Consider a stationary object, which does not move with respect to our transmitter. We send an electromagnetic wave to it, and it will reflect it with the same frequency (since it is not moving). This wave will return to the transmitter with a certain phase shift from which we can evaluate the distance between the object and the transmitter.
But we know that in general the composition of an incident wave and its reflected wave generates a standing wave. Therefore, why at the transmitter we get the incident and reflected waves (from whose phase shift we evaluate the distance), instead of a unique standing wave?