导航设备服务中断对信号覆盖影响的量化评估

Quantitative Evaluation for the Influence of Service Interruption of Navigation Equipment on Signal Coverage

为预判民航导航设备在特定位置或时间达不到运行要求时,对信号覆盖造成的影响,以航路、扇区覆盖为例,设计并实现一套导航台站查询与信号覆盖评估系统。首先综合考虑视距传播、基站天线辐射距离、视线截止距离等因素得到信号覆盖范围;然后基于射线法和二分法等建立设备信号覆盖范围变化的量化评估算法,包括距离量算和面积量算;最后,对设备失效前后航路、扇区的信号覆盖变化情况包括覆盖距离和面积变化等进行量化评估,并基于三维地理信息系统实现场景仿真,将覆盖变化情况三维可视化,生成评估报告,为设备故障应急处置和运行安全提供必要的数据支撑。

In order to predict the influence of signal coverage when the civil aviation navigation equipment failed to meet the operation requirements at a specific location or time,a system of station query and signal coverage evaluation was designed and implemented by taking route and sector coverage as an example.Firstly,the signal coverage was obtained by considering the factors of the distance of sight propagation,the radiation distance of the base station antenna and the line of sight cut-off distance.Then,based on ray method and dichotomy method,the quantitative evaluation algorithm of equipment signal coverage change was established,including distance measurement and area measurement.Finally,the signal coverage changes of the route and sector before and after the equipment failure,including coverage distance or area change,were evaluated quantitatively.Meanwhile,the scene simulation was realized based on the 3D geographic information system,and the coverage changes were visualized in three dimensions,then the evaluation report was generated,which provides necessary data support for emergency disposal and operation safety of equipment failure.