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Previous Page: Pulse Repetition Frequency
Maximum Unambiguous Range (R_{max}) and PRFThe primary reason for sending out discrete pulses of E-M energy at given time intervals is that this allows for target ranging. The listening period is the time from when the radar finishes transmitting the first pulse to when it begins transmitting the second pulse. This period allows the first pulse to travel a certain round trip distance. This distance when divided by 2 yields the maximum unambiguous range (R_{max}) of a radar. R_{max} can be expressed mathematically as where c = speed of light (~ 3 x 10^{8} ms^{-1})
and PRT = pulse repetition time (s) = 1/PRF |