Adaptive nulling techniques for look-down radar systems

Strong clutter has been shown to have a significant effect upon the performance of a conventional adaptive nuller. Two methods for resolving this problem have been presented. The first of these uses digital FIR filtering to remove the clutter return signals prior to adaptive nulling. The second method uses displaced phase centre antenna (DPCA) processing to remove the clutter prior to adaptive nulling. Of the two, the method using DPCA processing gives a more elegant solution since it integrates high performance adaptive clutter cancellation with adaptive nulling in a relatively simple architecture