一种旋转可控式二元AIS 八木天线阵列

为改善自动识别系统(AIS)数据丢失问题、增大AIS 基站通信距离、解决通信覆盖区域单一的问题, 针对传统AIS 全向天线和定向天线的不足,研究出旋转可控式二元八木天线阵,每个阵元都由八木天线组成,通过电控可以使两个阵元同步旋转,也可以分别旋转。当两八木天线平行时,天线阵增益最大,经测试可达近17 dBi。做了AIS 信息接收实验,天线可以接收距长江口50 海里以内水域的AIS 信息。通过各自旋转并改变天线阵元的角度,可以实现方向图的快速切换。对八木天线进行理论分析,利用基于有限元算法的HFSS 进行仿真,仿真结果与实验结果相近。该天线阵既确保了天线增益,又能通过电控来实现波束快速转换,较一般天线通信距离更长,且能灵活控制通信覆盖范围,对AIS 可靠的数据交换及海事监管具有一定的参考价值。

A Rotary Controllable Binary AIS Yagi Antenna Array

In order to reduce the loss of AIS data, increase the communication distance of AIS base station, and solve the problem of single communication coverage area, a rotating controllable binary Yagi antenna array is designed for the deficiency of traditional AIS omnidirectional antenna and directional antenna. Each array element is composed of Yagi antenna array, and the two array elements can be rotated synchronously or separately. When the two Yagi antennas are parallel, the antenna array has the maximum gain and can be tested up to nearly 17 dBi. Through the AIS information receiving experiment, the antenna can receive AIS information from the waters within the range of 50 n mile from the Yangtze River estuary . The fast switching of the pattern can be achieved by rotating and changing the angle of the antenna elements. The HFSS based on finite element algorithm is used for simulation, and the simulation results are similar to the experimental results. The antenna array not only ensures the communication distance, but also enables the beam to be quickly converted, so that the communication distance is longer and the flexibility is better than that of the general antenna. It has certain reference value for AIS reliable data exchange and maritime supervision.