An intermittent sampling and forwarding interference suppression method based on intra-pulse frequency-time-delay agile waveform

Intermittent sampling repeater jamming can rapidly and accurately sample and forward radar signals, and make use of the matching filtering characteristics of pulse pressure radar to form a false target group, which seriously affects the detection and tracking of the performance of radar targets. To improve the interference suppression effect under the condition of a high dry-signal ratio, an anti-intermittent sampling and forwarding interference method based on an iterative threshold segmentation algorithm was proposed based on the frequency-time-delay flexible waveform within the pulse. Firstly, the interfered and uninterfered echo signal segments are determined based on the iterative threshold algorithm, and the target position is determined. Then according to the location of the target and the random time delay information judge whether the interference and the target overlap in the time domain. Finally, according to the overlapping condition, the intermittent sampling and forwarding interference are suppressed by combining subpulse filtering and time domain filtering. The simulation results show that the proposed method has good anti-intermittent sampling and forwarding jamming performance under different SNR, JSR, and asynchronous sampling conditions.