一种用于频率可重构超宽带天线的改进的nABD测向算法

测向系统对于频带宽度、测角精度及测向范围等方面有着较高的要求。针对这一问题，对于接收天线的频率响应、阻抗带宽特性进行了可重构设计，以达到测向系统对宽频带的要求。同时，在所设计天线元方向特性的基础上，对传统的比幅测向算法nABD进行研究，给出相应的天线元加权系数调整方法，以获得较优的测角精度和测向范围。由仿真结果可知，所设计天线具有较好的工作频率范围与可重构阻带特性，所提测向算法可以获得较高的角度分辨率和较大的测向范围。

An Improved nABD Direction Finding Algorithm for Frequency Reconfigurable UWB Antenna

Direction finding system has strict requirement for the band width, angle measurement accuracy and direction finding range. To solve this problem, the frequency response and impedance bandwidth characteristic of receiving antenna are designed based on a reconfigurable technique, and the demand of wideband for the direction finding system is satisfied. And in this paper, the traditional n amplitude comparison bearing discriminator (nABD) comparing amplitude direction finding algorithm is studied on the basis of the designed antenna pattern, and a dynamic adjustment method of antenna weighting coefficient is proposed to get the better accuracy and range of direction finding. The simulation results show that the designed antenna has wide frequency range and appropriate reconfigurable notched band, and the proposed algorithm can obtain better resolution and greater direction finding range.