面阵是雷达系统的主要形式之一，文中主要研究平面相控阵系统的自适应数字波束形成算法。面阵系统所用阵元数多，数据量大，要实现DBF有很大难度，目前针对面阵DBF技术的研究也较少。文中介绍了基于面阵的SMI自适应DBF算法，该算法有较好的性能，适于大型阵列的处理实现。为了提高实时性，改善SMI算法的副瓣性能，常常采用对角加载（DL）技术。DL加载值的选择非常关键，对此也进行了详细的讨论，并提出对角加载不仅可以改善SMI算法的副瓣性能，还可以在一定程度上抑制阵列通道幅相起伏误差对算法性能的影响。

Planar array radar is one of the most important radar forms in radar systems.An adaptive digital beamforming algorithm for planar phased array system is studied in this paper.The element number and the data quantity of the planar array are quite large,so it is difficult to apply DBF to planar array,and the corresponding study is few.SMI algorithm based on planar array is recommended,for the algorithm can operate in high speed.In order to improve the performance of the sidelobe of the algorithm,diagonal loading(DL) technique could be applied.The selection of the DL value is very important. This issue is discussed in detail in the paper,and it is proposed that the diagonal loading technique can limit the influence of the channel error of the array on the performance of the algorithm.

TN958.92