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分析了天基双基地雷达的地杂波距离模糊引起的杂波多普勒展宽特性。针对天基双基地雷达距离模糊杂波的抑制问题,提出了一种基于俯仰维信息的正交投影(OP)空时自适应处理(STAP)算法。该算法利用杂波空间导向矢量中的俯仰信息来构造正交投影矩阵,然后对投影后的空时数据进行空时自适应处理。结果表明,基于俯仰维信息的正交投影变换实现了对待检测距离单元数据的有效提取,降低了距离模糊杂波对STAP性能的影响。
The clutter Doppler broadening characteristics caused by the ambiguity of ground clutter in space-based bistatic radar are analyzed. Aiming at the suppression of ambiguous clutter in space-based and bistatic radar, an Orthogonal Projection (OP) space-time adaptive processing (STAP) algorithm based on pitch information is proposed. The algorithm uses the pitch information in the clutter-space steering vector to construct the orthogonal projection matrix, and then performs the space-time adaptive processing on the projected space-time data. The results show that the orthogonal projective transform based on pitch information can effectively extract the data of the distance unit to be detected and reduce the influence of distance fuzzy clutter on the performance of STAP.