Abstract: In order to ensure the safety of intelligence in important place, a jamming approach to synthetic aperture radar (SAR) based on inter-pulse subsection random frequency-shift technique is presented. The technique can produce several noise-like jamming swathes in range direction, of which number is determined by the number of inter-pulse subsection. The position and width of the jamming swathe are determined by frequency shift. The proposed technique overcomes the defect of the conventional fixed frequency-shift jamming which can’t protect distributed target, and produces several jamming swathes compared with random frequency-shift technique which can produce only one jamming swathe. Meanwhile, because of the random change in frequency shift, it is difficult for SAR to find the frequency shift rule and take the corresponding countermeasures. An application model is established, and the implementation steps and method of the technique are provided. The availability and advantages of this method are proved through the simulation experiments.

Key words: radar engineering, randomly-shift-frequency, subsection, synthetic aperture radar