水面无人艇搭载鞭天线最佳工作频率分析

Analysis of the best working frequency of whip antenna on surface unmanned vehicle

为了保证水面无人艇与接收目标实现近距离通信,结合采用3~50 MHz频段的鞭天线辐射与电磁波传播特性,确定处于最佳工作频率时在不同距离能接收最大场强,计算海面鞭天线在多个状态下的辐射效率并得到仿真结果;采用地波传播衰减因子模型进行定量分析且进行仿真实验,最终获得鞭天线在海面工作时多种状态下不同距离的最佳工作频率。理论分析与仿真结果均表明:随着距离增加,处于各种状态的鞭天线相应接收场强减小;随着倾斜角度增大,最佳工作频率呈增长趋势,接收场强不断减小。

In order to ensure that the surface unmanned vehicle and the receiving target achieve close-range communication, the whip antenna radiation and electromagnetic wave propagation characteristics are combined in the 3~50 MHz frequency band to determine the maximum field strength that can be received at different distances. The radiation efficiency of the whip antenna on the sea surface under multiple conditions is calculated and the simulation results are obtained;the ground wave propagation attenuation factor model is used for quantitative analysis and simulation experiments, and finally the best working frequency of the whip antenna at different distances under various conditions when working on the sea surface is obtained. Theoretical analysis and simulation results show that as the distance increases, the corresponding reception field strength of the whip antenna in various states decreases, with the increase of the tilt angle, the optimal operating frequency shows an increasing trend, and the reception field strength continues to decrease.