A novel ECCM scheme against interrupted-sampling repeater jamming using intra-pulse dual-parameter agile waveform

The interrupted-sampling repeater jamming (ISRJ) can generate a train of false targets after pulse compression, which seriously degrades the performance of the radar system. In this paper, a novel electronic counter-countermeasures (ECCM) method against the ISRJ is studied. First, according to the discontinuous and periodic characteristics of the ISRJ, a new radar waveform called the intra-pulse dual-parameter agile waveform is presented, which not only brings excellent anti-jamming performance, but also increases the differences between the radar signal and the ISRJ signal. Then, a parallel interference suppression method based on fractional Fourier transform (FrFT) is proposed to counter the ISRJ. In the proposed method, the interfered signals are transformed into the fractional Fourier domain. And filters are utilized to suppress the interference components as well as reserve the radar signal components. Finally, several numerical simulations are provided to verify the effectiveness of the proposed anti-jamming scheme in typical scenarios. Simulation results show that the proposed ECCM scheme can effectively suppress the typical ISRJ without loss of target echo energy. • The intra-pulse dual-parameter agile waveform is proposed to counter the ISRJ. • Using the proposed waveform, a novel FrFT-based ISRJ suppression scheme is studied. • The proposed ECCM scheme can suppress the ISRJ without loss of target echo energy.