In Forward-Looking Airborne Radar (FLAR), the covariance matrix of the Cell Under Test (CUT) is not accurately estimated which is caused by the range-dependence problem, and it declines the clutter rejection performance of the Space-Time Adaptive Processing (STAP). The space-time interpretation method is one of the interpretation methods which can handle the range-dependence efficiently, however, it requires huge computation load, and brings great challenge to the real-time processing of this method. This paper proposes a space-time separated interpretation method. The proposed method makes the space-time interpretation transform in spatial domain and temporal domain separately. Comparing with space-time interpretation method, the proposed method can reduce the computation load greatly while having a little STAP performance loss. In addition, the proposed method can achieve good performance when the antenna error exists. The computer simulation results show the validity of the proposed method.%在机载前视阵雷达中,由于杂波距离相关性的存在,导致待检测距离单元杂波的协方差矩阵估计存在偏差,致使空时自适应处理(STAP)的杂波抑制性能下降.空时插值法是一种内插变换方法,能够有效降低机载前视阵雷达杂波的杂波距离相关性,然而该方法计算量非常大,给它的实时处理带来困难.该文提出一种空时分离的插值方法,该方法将空时插值方法在空域和时域分别独立实现.与空时插值方法相比,该方法能够在性能损失不大的情况下,极大地降低计算量,并且当存在阵元误差时,该方法也能获得好的处理性能.计算机仿真结果验证了该方法的有效性.
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