一种新型自适应天线的波达方向估计特性分析

ANALYSIS ON THE ESTIMATION OF DIRECTION OF ARRIVAL OF A NOVEL ADAPTIVE ANTENNA

针对杜惠平(1999)提出的一种基于菲涅尔相位修正聚焦结构的多波束自适应天线,利用最大似然估计算法实现了这种自适应天线的空间来波方向估计,考虑了信躁比、快拍次数和阵元间距等参数对估计结果的影响,分析了估计的统计性能及其克拉美-罗界,所做工作适用于透射型和反射型菲涅尔区板天线。仿真计算与有关文献理论分析结果吻合较好,表明本文建立的菲涅尔区天线波达方向估计模型的有效性。

The problem of estimating the Direction-Of-Arrival(DOA) of multiple source signals far from the sensors using a novel adaptive antenna suggested by Du Huiping(1999) in the presence of spatially white Gaussian noise is addressed based on the Maximum Likelihood(ML) function approach. The effects of the Signal to Noise Ratio(SNR), snapshots and space of sensors are investigated. The statistical performance of ML estimators as well as the Cramer-Rao Bound(CRB) are analyzed. Comparison of the simulation results with the other articles shows the validity of the theoretical analysis.