A NOVEL UNIVERSAL PREPROCESSING APPROACH FOR HIGH-RESOLUTION DIRECTION-OF-ARRIVAL ESTIMATION
一种通用的高分辨率波达方向估计预处理新方法

A new universal preprocessing method is proposed to estimate angles of arrival with high resolution, which is applicable to one- or two-dimensional high resolution processing based on arbitrary center-symmetric arrays (such as uniform linear arrays, equal-spaced rectangular planar arrays and symmetric circular arrays). By mapping the complex signal space into the real one. the new method can effectively off load computational amount needed in the signal subspace high resolution direction finding techniques without any performance degradation. In addition the new preprocessing scheme itself can decorrelate the coherent signals received by the array. For regular array geometry such as uniform linear arrays and equal-spaced rectangular planar arrays, the popular spatial smoothing preprocessing technique can be combined with the novel approach to improve the decorrelating ability. Simulation results confirm the above conclusion.