复合式均匀圆阵提高相关信号DOA估计性能

为使均匀圆阵能进行相关信号的全方位DOA估计及提高系统性能,论文利用基于自适应天线 理论方向图综合技术的子圆阵构成复合式测向均匀圆阵,再运用混合DOA估计方法进行DOA估计。仿 真结果证明复合式测向均匀圆阵在一定程度上使分布区域较广的相关信号的DOA估计成为可能;增加了 可检测的信源数目;提高了系统抗干扰能力及分辨率、使系统判模糊能力增强,稳健性能增加。

A Compound Circular Array for Performance Improvement of DOA Estimation for Coherent Signals

In order to achieve circular array estimate for the DOA of coherent signals in all orientation and to improve the performances, a new estimation method is proposed in this paper. The method combines the hybrid DOA estimation algorithm and the compound circular array formed by sub-arrays that use the pattern synthesis technique based on adaptive array theory. Simulation results indicate that the new method makes the DOA estimation possible for coherent signals in all orientation in some degree. It also increases the number of estimated coherent signals, and improves the ability of resisting interference and resolution. Therefore the ambiguity is reduced and the robust is enhanced accordingly.