一种非均匀环境中鲁棒的STAP算法

Robust STAP Algorithm in Heterogeneous Environment

针对非均匀环境对STAP性能的影响,提出了一种新的结构化STAP算法:首先根据已知的杂波结构、系统参数直接构造杂噪协方差矩阵,再根据样本对其结构进行自适应调整,并由调整后的矩阵构造最终的空时权矢量。由于协方差矩阵并不由训练样本直接估计构成,此算法在实际处理中受各种非均匀现象的影响极小。三通道机载雷达实测数据处理结果表明,此算法在实际环境中,具有良好的检测性能,是一种非均匀环境中鲁棒的STAP技术。

According to the performance loss of STAP caused by the heterogeneous environments,a new structured STAP algorithm is proposed.In the new algorithm,the clutter-plus-noise covariance matrix is formulated by taking advantage of the known structure of ground clutter and parameters of system.The structure of the so called structured matrix then undergoes several adjustments via taper matrices and is employed to calculate the space-time weight vector.Since the covariance matrix is not estimated directly using the sample vectors,the impact of heterogeneous environments is negligible in this procedure.Experimental results from a three-channel airborne radar are employed to verify the outstanding detection performance and robustness to heterogeneous environment of this algorithm.