Abstract
When the airborne early warning (AEW) radar transmits signal with medium or high pulse repetitive frequency (PRF), range ambiguity occurs at the receiver. For non-side looking airborne radar (non-SLAR), the short-range ambiguous clutter suffers from serious range dependence. As a result, the clutter plus noise covariance matrix cannot be correctly estimated, and the performance of clutter suppression obtained by space-time adaptive processing (STAP) degrades greatly. A robust elevation prefiltering method is proposed. This method can suppress the ambiguous short-range clutter by exploiting multi-elevation angles constraint, resulting in a deep and wide beam notch in the elevation angle corresponding to the short range. Moreover, the method offers potential robustness to combat the platform height with uncertain errors. Simulation results show the validity of the method.
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