利用预投影变换提高分布式目标波达方向估计性能

Improving the DOA estimation performance of distributed sources via projection pretransformation

在有限次快拍和存在系统误差时,分布式目标波达方向高分辨方法性能变差.预投影技术可以在一定程度上降低子空间方法对系统误差的敏感度,减少非期望信号方向上的能量,可以根据信号方向的粗略估计和阵列流形知识预先计算得到投影算子.预处理技术具有有效性和稳健性.

System errors and small samples result in bad performance of high-resolution DOA estimation of distributed sources. A novel projection transformation method is presented in this paper, which can, to some extent, decrease the signal subspace sensitivity. The projection operator can be obtained by both preliminary direction estimation and array manifold. Thus the performance of DOA estimation is improved by means of projection techniques, which is confirmed by both theoretical analysis and computer simulations.