Pulse repetition frequency, Beam width, Relationship between PRF and range
Pulse repetition frequency PRF
PRF – pulse repetition frequency
Or, PRR – pulse recurrence rate.
Number of pulses sent out per second.
Radar scanner sent out radar pulse.
Normally 500 to 4000 pulses per second.
PRF varies with range scale.
Width of a transmitted radar beam.
Two types: HBW, VBW
Horizontal beam width: Horizontal angle at the scanner between the leading edge and trailing edge.
Vertical beam width: Vertical angle at the scanner between the upper edge and lower edge.
Relationship between PRF and range
Picture resolution of a RADAR set is governed by RPM-PRF relationship.
In short range, at a constant RPM, PRF – 2000.
In long range, at a constant RPM, PRF – 1000.
Because in long range, it’s not possible a greater interval between pulses to go and come back, results in low PRF.
Therefore, long range have a low PRF and short range have a high PRF.
Due to this,
In short range, picture quality will be good.
In long range, picture quality will not be good.