Understanding the pulse repetition interval. I - Pulsed time-domain receivers

It is noted that conventional radar signals are distinguished mainly by five parameters: carrier frequency, pulse repetition interval, pulse shape (sometimes simplified as pulse width), the angle of arrival, and the amplitude scan pattern. These parameters are independent and form an independent set for the purposes of admitting or receiving a particular emitter's signal. A receiver may use any of the five to select signals, each having its own strengths and weaknesses. Attention is called to a system that is quite effective, even in situations which require de-interleaving of multiple signals and where the input data are extremely contaminated with signal dropouts and noise pulses. This system is the human ear. As an auditory processing system, the ear operates 'wide open' over the audible rangae and is able to detect weak signals even in the presence of strong signals.