用菲涅尔平板天线实现相干来波方向的估计

ESTIMATION OF DIRECTION-OF-ARRIVAL OF COHERENT SIGNALS USING FRESNEL ZONE PLATE ANTENNA

菲涅尔平板天线由于其具有宽频带、重量轻、馈电简单和易于共形等优点,可替代透镜天线用于毫米波成像或用作微波移动通信中的接收天线单元等。同时,其作为聚焦器件,通过与馈源阵列组合,可以构成一种新型的自适应天线应用于蜂窝移动通信的基站智能天线等领域。基于其良好的工程应用前景,本文在对有关研究工作简要回顾的基础上,深入分析其去相关机理,应用极大似然估计算法实现了相干信号源在大角度入射的情形下,菲涅尔平板天线对来波方向的有效估计,避免了应用MUSIC算法进行来波方向估计时所遇到的观察区域的限制问题。仿真计算和有关文献数值分析结果的比较表明,菲涅尔平板天线具有良好的空间谱估计性能。

Fresnel Zone Plate(FZP) antenna with high performance on wideband, lightweight, simple feed system and easy conformability , have been regarded as a replacement of the lens antenna in the millimeterwave imaging or used as the receiving element in microwave mobile communications. Using FZP as a focusing component, a novel adaptive antenna can be formed and can be used as a smart antenna in the base station. In consideration of the engineeringoriented prospect, we make a thorough investigation of the eliminating correlation mechanism of FZP antenna, on the basis of the overview of the previous work, and realize efficient estimation of the directionof arrival (DOA) under wideangle multiple coherent signals incident using maximum likelihood approach, avoiding the problems of the field of view inherent in FZP antenna invoking MUSIC algorithm for estimation of the DOA. Simulations have been carried out to show the good spatial spectrum estimation performance of the FZP antenna, comparing with the other previous studies.