Interrupted-sampling repeater jamming suppression based on STFrFT
Jammers can rapidly slice and forward radar pulse to form interrupted-sampling repeater jamming.If it enters from the main lobe of radar,it will pose a serious threat to radar target detection.Starting from waveform design and time-frequency analysis,a main lobe interrupted-sampling repeater jamming suppression method is proposed based on short-time fractional Fourier transform(STFrFT).Firstly,an intra-pulse frequency agility signal is harnessed to improve the distinguishability between jamming and target signal.Moreover,the STFrFT is applied to time-frequency analysis,which significantly improves the time-frequency analysis accuracy compared with traditional short-time Fourier transform methods and removes the restrictions on signal parameters compared with fractional Fourier transform methods.Finally,through eliminating jamming by using image processing methods,the interference of high jamming-to-signal ratio from the main lobe of radar is suppressed effectively.The simulation results indicate that the proposed method can effectively suppress interrupted-sampling repeater jamming in various environments.
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