Abstract
The unambiguous range of a pulse-radar is related to the pulse repetition interval (PRI). Most magnetron-based marine radars adjust the PRI according to the maximum displayed range. They correspondingly adjust the pulse-width (PW) to keep the ratio PW/PRI nearly constant. The extreme settings can be described as ‘short pulse, short PRI’ (SPSP) for short distances and ‘long pulse, long PRI’ (LPLP) for long distances. Such settings keep the transmitter's duty cycle and the energy-on-target, relatively constant. Penalties of long PW are large clutter area illumination and poor range resolution. Maintaining a short pulse is important in magnetron-based radar, because a magnetron does not lend itself to pulse compression. The study presents a method that allows operating in the SPSP mode for long distances as well. Both theory and experimental results are presented.
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