基于空时内插的机载双基地雷达杂波抑制方法

摘要

针对机载双基地雷达下视环境下非均匀地杂波的抑制问题,首先论述了抑制双基地机载雷达非均匀杂波的内插变换类空时自适应处理(space time adaptive processing,STAP)方法.然后在此基础上,提出了一种改进的空时二维内插变换方法(improved space time interpolation transfor mation,ImSTINT).该方法将训练样本的杂波子空间映射到单基地地基雷达的杂波子空间中,减少了变换后杂波子空间的自由度.仿真表明该方法比传统的内插变换类方法的杂波抑制性能好,且具有较强的稳健性和较少的样本量需求.%This paper focuses on the problem of nonhomogeneous clutter suppression of bistatic airborne radar. Firstly, the conventional space time adaptive processing ( STAP) algorithms are discussed for the suppression of the nonhomogeneous clutter in bistatic airborne radar. Secondly, based on the analysis of previous methods, an effective STAP algorithm based on the improved space time interpolation transformation (ImSTINT) is presented. The clutter subspace of training sample in the bistatic airborne radar can be projected to the clutter subspace monostatic radar via the proposed algorithm, and the degrees of freedom of clutter subspace is decreased greatly after the transformation. The performance of the proposed algorithm is more perfect robust than conventional STAP algorithm, and has a lower requirement of training data.