相干多径环境下的波束形成技术研究

Research on Beamforming Technology in Coherent Multipath Environment

自适应阵列的性能在相干环境下会急剧下降。常用空间平滑技术对接收信号进行预处理。然而,均匀空间平滑不能完全去除信号间的相干性,对相干信号的抑制并不理想。该文根据线性约束最小方差(LCMV)准则,分析了空间平滑基础上的信号子空间投影、正交投影和斜投影三种投影方式的性能效果。仿真结果表明,斜投影有着比信号子空间投影更高的性能,同时比正交投影更易于实现。

Performance of adaptive array will decline dramatically in coherent enrivonment,and the general solution is spatial smoothing.However,uniform spatial smoothing can＇t completely remove the correlativity between the signals.Thus the suppression of coherent signals is unsatisfactory.In this paper,according to the criterion of linear-constrained minimum variance（LCMV）,we analysis the performance of three projections which are the subspace projection based on space smoothing,orthogonal projection and oblique projecion.The computer simulation shows that the oblique projection has a better performance than the subspace projection,while easier to implement than orthogonal projetion.