Noncooperative radar target identification using fourth-order correlations

In this communication, a new method for radar target identification using only radar returns or scattered responses of conducting targets is proposed. Our scheme includes, before filtering with a constructed discriminant filter and named extinction filter (EF), a new stage in which the fourth-order correlation (FOC) sequence of the unknown-target impulse-response is estimated. The subsequent stage uses these natural resonances to identify the target. Simulation results clearly show that significant improvements are achieved by using the fourth-order moments sequence of x(n) as the unknown-target signature instead of the original signal x(n) in the discrimination scheme