Technique to counter active echo cancellation of self‐protection ISRJ

In the active echo cancellation (AEC), the jammer can suppress the true target by superimposing on it a false target with the same amplitude and inverted phase. Under certain conditions, the interrupted‐sampling repeater jammer (ISRJ) performs a kind of partial AEC against chirp radars. A novel technique that not only eliminates the effect of a self‐protection ISRJ is proposed, but also the jamming signal power to augment the power of the true target is exploited. The theoretical analysis of this technique is presented and its effectiveness is verified by simulation.