They are also referred to as pulsed time-of-flight systems. Their working principle is very much like ultrasonic level transmitters. “Pulsed Wave systems emit a microwave burst towards the process material.
This burst is reflected by the surface of the material and detected by the same sensor which now acts as a receiver. Level is inferred from the time of flight (transmission to reception) of the microwave signal.”
The power range of pulse radar systems is very less as compared to FMCW systems. Hence, their performance gets largely influenced by tank obstructions and materials having low dielectric constants and foams.