一种利用旋转结构的分布式信号DOA估计方法

某些领域中由于多径影响信号往往具有分布特性,此时传统波达方向(DOA)参数估计算法往往失效.针对此类问题提出了一种无需搜索的分布式信号DOA估计算法,该方法利用已知信号有用信息逐一估计分布信号在相邻阵元间产生的旋转因子,利用DOA旋转不变结构估计分布目标DOA参数.与点目标ESPRIT方法相比该方法能够有效克服多径扩展影响,不敏感于多径分布的具体形式,并在一定程度上抑制相位误差影响.仿真实验证明了其有效性.

A approach to DOA estimation of distributed signals using rotational invariance structure

In some fields, the performance of traditional DOA parameter estimation algorithms descend badly because of the influence of multipath signals with distribution character. By using the known signal information and estimating the rotational factors induced by distributed signals between adjacent array elements, this paper presents a DOA estimation algorithm without search process. The DOA parameters can be estimated by rotational invariance structure between the adiacent array elements. Comparing with traditional point-based ESPRIT algorithms, the method proposed can restrain multipath distribution and is not sensitive to different distribution forms, and can restrain some phase errors as well. Finally simulations show its correctness.