阵元指向未知条件下的信号波达方向估计

Direction finding with unknown antenna orientation

提出了一种适用于阵元指向未知情形的极化敏感阵列信号波达方向(DOA)估计方法。该方法利用降秩准则将信号方向、极化和阵元指向信息进行解耦,通过唯角度参数搜索完成信号DOA估计,避免了复杂的多维寻优。讨论了新方法实现无模糊DOA估计的必要条件,并将其与利用错误指向信息的DOA估计方法进行了性能比较。结果表明:对于阵元指向未知或存在一定误差的场合,该算法的估计性能更优。

A new DOA estimation method is proposed for polarization sensitive array with unknown or uncalibrated antenna orientation.Signal direction,polarization and sensor orientation information are uncoupled by exploiting the rank-reduction criterion,enabling direction finding with angle-only searching.Necessary condition for unambiguous DOA estimation is studied,and its performance is compared with the method which exploits the error sensor orientation information.The result shows that the performance of the porposed method is better when the antenna orientation information is unknown or with error.