Robust space-time adaptive processing for airborne radar in nonhornogeneous clutter environments
Robust space-time adaptive processing for airborne radar in nonhornogeneous clutter environments
复制标题
DOI：
10.1109/taes.2003.1188894
复制
发表时间：
2003-03
影响因子：
4.4
通讯作者：
Yongliang Wang;Jianwen Chen;Z. Bao;Yingning Peng
中科院分区：
文献类型：
--
作者：
Yongliang Wang;Jianwen Chen;Z. Bao;Yingning Peng
空时自适应处理（STAP）在采用相控阵天线和脉冲多普勒处理方式的新一代机载侦察雷达中具有巨大的应用潜力。针对机载相控阵雷达，提出了一种基于多波束多多普勒通道的空时自适应方法。空时多波束（STMB）结构的方法是强大的阵列误差，并具有非常低的系统自由度（DOFs）。因此，该方法对样本支持要求低，非常适合于非均匀杂波环境下的实际平面相控阵雷达。同时，本文还提出了一种新的基于关联维数的非均匀检测器（NHD），作为在检测处理前筛选跟踪数据的有效方法。它可以进一步提高STAP方法在严重非均匀杂波环境中的性能。因此，建议将关联维数非均匀性检测器（CD-NHD）与STMB相结合的方案，我们称之为CD-NHD-STMB。仿真结果表明：STMB处理器对阵元误差具有较强的鲁棒性，在非均匀杂波环境下具有较高的性能; CD-NHD处理器对非均匀杂波也有较好的处理效果。因此，CD-NHD-STMB方案对阵元误差和非均匀杂波具有鲁棒性，因此可用于机载相控阵雷达应用。
Space-time adaptive processing (STAP) holds tremendous potential for the new generation airborne surveillance radar, in which the phased array antennas and pulse Doppler processing mode are adopted. A new STAP approach using the multiple-beam and multiple Doppler channels is presented here for airborne phased array radar. The approach with space-time multiple-beam (STMB) architecture is robust to array errors and has very low system degrees of freedom (DOFs). Hence, it has low sample support requirement and it is very suitable for the practical planar phased array radar under nonhomogeneous clutter environments. Meanwhile, a new nonhomogeneous detector (NHD) based on the correlation dimension (CD) is also proposed here, which is used as an effective method to screen tracing data prior to detection processing. It can further improve the performance of the STAP approach in the severely nonhomogeneous clutter environments. Therefore, a scheme that incorporates the correlation dimension nonhomogeneity detector (CD-NHD) with the STMB is recommended, which we term CD-NHD-STMB. The experimental simulation results indicate that: 1) the STMB processor is robust to array element error and has high performance under nonhomogeneous clutter environments; 2) the CD-NHD is also effective on the nonhomogeneous clutter. As a result, the CD-NHD-STMB scheme is robust to array element error and nonhomogeneous clutter, and therefore available for airborne phased array radar applications.