基于空间聚焦的到达角估计

Estimation of direction-of-arrival with spatial focusing

提出了基于空间聚焦的宽带信号到达角(DoA)估计算法。该算法利用对称阵子和双线性变换将多个宽带信号聚焦至各自的瞬时频率,再通过傅里叶变换,在信号的各自瞬时频率上构造相关矩阵,由此构造MU-SIC空间谱,即可获得信号的DoA。该算法是先频域区分信号,再DoA估计,即采用了分维处理的方法,可实现信号频率-DoA的自动配对,避免了宽带信号DoA估计的(ω,θ)模糊问题。给出了两种实现空间聚焦的对称阵列结构。计算机仿真结果表明算法是正确的。

To estimate the direction-of-arrival （DoA） of wideband signals, a kind of method with spatial focusing is presented. Firstly, the wideband signals are focused onto the instantaneous frequency respectively with symmetric antenna and bi-linear transformation. Secondly, the correlation matrices are constructed on the signals＇ instantaneous frequency, and with MUSIC spatial spectrum, the DoAs can be obtained at last. The algorithm can avoid the （ ω, θ） ambiguity of DoA estimation because of the separable dimension processing. Two kinds of symmetric arrays to spatial focusing are illustrated. The computer simulations demonstrate the correctness of the proposed method.