Complex sentence: Pulse-Doppler radars use a medium to high PRF (on the order of 3 to 30 kHz), which allows for the detection of either high-speed targets or high-resolution velocity measurements.
Split into simpler sentences: Pulse-Doppler radars use a medium to high PRF (on the order of 3 to 30 kHz). This medium PRF allows for the detection of either high speed targets or high resolution velocity measurements.