Automatic detectors for frequency agile radars

When frequency agility is used in radars, the received sidelobe jamming power can vary by as much as 20 dB even though the transmitted jamming power is constant over the radar bandwidth. Various detectors were compared using simulation techniques; the best detector was the ratio detector, which normalizes the received power on every pulse with the surrounding reference cells and then sums these normalized power ratios. In the presence of short-pulse interference, a low false-alarm rate can be maintained by soft-limiting of the individual power ratios.