基于双模天线阵列的ESPRIT波达方向估计

考虑阵列信号波达方向(DOA)估计问题,提出了一种基于双模天线阵列的模式域旋转不变参数估计(ESPRIT)算法.与传统空域ESPRIT相比,模式ESPRIT的旋转因子仅与信号DOA有关而与阵列结构无关,因而无需阵元位置信息,也无需阵列存在空间匹配子阵.若阵元位置信息精确已知,还可利用空域稀疏采样获得无模糊多尺度DOA估计.计算机仿真结果验证了算法的有效性.

Mode-ESPRIT for DOA estimation using a dual-mode antenna array

The problem of direction-of-arrival(DOA) estimation using an array of multiple identically oriented dual-mode antennas is addressed.A new mode-estimation of signal parameters via rotational invariance techniques(ESPRIT) algorithm is presented,it uses rotational invariances between two subarrays of different modes in which the rotational factors depend only on the DOA of signal.This method requires no information about the element positions and removes the constraint of the traditional spatial-ESPRIT on the array spatial geometry.A multi-scale mode-ESPRIT variant for sparse arrays is further given for the case of known element positions,to produce high quality but unambiguous DOA solutions by fusing two sets of DOA estimates.Numerical results are given to illustrate the performance of the proposed algorithms.