A monostatic pulse radar can not transmit a pulse at
the same time as it receives pulses reflected from targets.
Consequently, whenever the radar system is transmitting a pulse, it
is blind to any returned pulses that are arriving at
the radar site.
Pulses that have been received this quickly (during
the transmission of the pulse) would necessarily come from targets
that were either very close to the radar system or
very distant from the radar. The pulse width of a
radar system therefore determines its blind range or
minimum range. Targets falling within this range from the radar
system are not detected.