Which statement best describes Pulse Repetition Interval (PRI)?

• A. Pulse Repetition Infringement
• B. Pulse Repetition Interval (PRI)
• C. Pulse Return Interval
• D. Pulse Ramp Integer

Answer: (B)

PRI is the time between the starts of successive radar pulses. This timing sets how often the transmitter emits pulses. If the PRI is constant, the pulse repetition frequency is the reciprocal: PRF = 1 / PRI. A longer PRI means fewer pulses per second, which increases the maximum unambiguous range because the echo from a target must return before the next pulse is sent. The duty cycle, or how much of the PRI is occupied by the actual pulse, is PW / PRI, linking to average power. The other choices don’t describe the standard meaning of PRI.