摘要
传统基于可视域分析方法获得的地面站信号覆盖常常无法准确反映系统的实际监视性能。提出一种针对不规则地形的广播式自动相关监视(ADS-B)地面站信号覆盖分析方法。首先针对不规则地形信道特点,推导了Longley-Rice模型的具体仿真算法,提出利用该模型模拟航空无线信道;仿真符合ADS-B规范标准的天线,计算信号在自由空间的辐射距离;然后结合由地物遮挡引起的视线截止距离,进行综合比较得出最终覆盖范围;最后选取某地为例进行研究和分析,与其他算法比较,用实际数据对预测范围进行验证。实验结果表明,不规则地形是影响地面站覆盖的关键因素,Longley-Rice模型可以准确模拟信号衰减。本文方法为地面站选址提供理论支持。
The coverage of ground station obtained via the traditional method based on the visual domain analysis can not accurately describe the practical performance of the system coverage.An irregular topography ADS-B ground station signal coverage analysis method is proposed in this paper.First,according to the characteristics of the irregular topography channel,specific simulation algorithm of Longley-Rice model is derived,and the model is used to simulate the ground-to-air communications channel.Second,the antenna that meets the requirements of ADS-B standard is simulated,and the radiation range of signal in free space is calculated out.Then,analysis is made to the sightline range cut-off caused by terrain shading.Finally,taking a certain area as an example,comparison is made with other algorithms by verifying the forecast range with the actual data.Experimental results show that： 1） The irregular topography is the key factor influencing the ground station signal coverage; and 2） Longley-Rice model can accurately simulate signal attenuation.The method in this paper provides a theoretical support for the location selecting of ground station.
出处
《电光与控制》
北大核心
2016年第6期84-89,共6页
Electronics Optics & Control
基金
天津市应用基础与前沿技术研究计划(14JCYBJC16000)
