How are Pulse Repetition Interval (PRI) and Pulse Repetition Frequency (PRF) related?

Pulse Repetition Interval (PRI) and Pulse Repetition Frequency (PRF) are fundamentally related through an inverse relationship. PRI is the time duration between consecutive pulses of a radar signal, typically measured in seconds, while PRF refers to the number of pulses transmitted per second, measured in hertz (Hz). The mathematical relationship between these two concepts can be summarized as follows:

PRF is equal to the reciprocal of PRI. This means that as the PRI increases (more time between pulses), the PRF decreases (fewer pulses transmitted per second), and conversely, as the PRI decreases (less time between pulses), the PRF increases (more pulses transmitted per second). Hence, the relationship is inversely proportional, meaning that they vary in opposite directions.

This principle is critical in electronic warfare and radar systems, as understanding the relationship between PRI and PRF can influence radar performance, detection ranges, and the ability to effectively jam or avoid detection.