Abstract:

Interruptedsampling repeater jamming (ISRJ) is a new kind of coherent jamming to the large time bandwidth linear frequency modulation (LFM) signal. Many jamming modes, such as lifelike multiple false targets and dense false targets, can be made by setting up different parameters. According to the characteristics of the ISRJ “storagerepeaterstoragerepeater”, the energy function is defined and a method is proposed to extract the target echo data not disturbed by the jamming signal based on the difference between the target echo signal and jamming signal energy functions. Then, the extracted data is treated as the compressed data, which has linear relationship with the sparse frequency domain of the target echo signal, and a compressed sensing minimization model is established. Finally, the orthogonal matching pursuit algorithm is utilized to recover the target echo signal, which means the ISRJ is suppressed simultaneously. The Monte Carlo simulations show that good jamming suppression performance and high antijamming probability can be achieved under appropriate threshold, and what’s more, the proposed method is applicable to both mediumband LFM radar using the matched filtering and wideband LFM radar using dechirping.