飞机进近着陆系统多径效应仿真研究

Research on Simulation of the Multipath Effect of the Approaching Landing System for an Airplane

在分析某型飞机进近着陆系统多径效应问题产生机理的基础上,提出了一种基于散射体模型库设计和射线追踪理论的飞机进近着陆系统多径效应仿真方法,建立了天线、散射体、信道和接收机仿真模型,给出了着陆系统多径效应仿真方法、实施步骤和具体算法流程。并以停靠在跑道附近的飞机造成的多径干扰为例,运用该方法进行了数值仿真。结果表明:仿真方法能够较准确的给出多路径散射对系统的干扰程度,并具有提前预测计划配置物体对系统干扰程度的能力。采用飞机进近着陆系统的多径效应仿真大大提高了机场解决多径效应影响的效率,扩大了该型飞机的活动范围。

Based on analyzing the principle of the multipath effect of the approaching landing system, a simulation method of the multipath effect was proposed by the scatter model-database design and ray tracing theory. The subsystem models of antenna, scatters, receiver and channel were established. The method of multipath simulation, the steps of implementation and the detailed algorithm process were given. Moreover, the computer simulation was made for the practical problem caused by an airplane close to the centerline. The simulated results show that the simulated method can evaluate the disturbance of multipath scattering to the system accurately and predict the disturbance of the planned building. The solving efficiency of the multipath effect is improved greatly because of the system simulation, and then the flight range is extended largely.