Time-space two-dimensional dense false targets jamming and countermeasures

Based on digital radio frequency memory (DRFM) technology, radar jammer can copy the radar signal multiple times with different time delay and frequency shift to form dense false targets jamming in the time domain. For non-self-protection type jamming, a two dimensional dense false targets can be formed by multiple jammers which has a great influence on radar angle and range measurement. In order to antagonize the time-space two-dimensional dense false target, this paper analyses the formation mechanism of dense false target jamming in the time and spatial domain, and then proposes pulse repetition period (PRT) agility and inter-frame multiplicative non-coherent accumulation method in the time domain and angle clustering and spatial filtering in the space domain. Finally, the effectiveness of the method is verified by MATLAB simulation.