进场着陆系统多径效应激光模拟的可行性分析

为了研究机场进场着陆系统存在的多径效应问题,利用激光波束赋形容易实现的特点,以电磁系统缩比理论为基础,利用可控的激光发射装置发射强方向性并具有特殊要求宽度和范围的激光扫描信号模拟着陆导航系统角度制导天线的功能,对该方法的可行性从波源相似性、反射点坐标相似性、信号到达时间在时间轴上相似性、障碍物模型对激光的散射特性、相位的非精确相似等5个方面进行了深入分析,并进行实验,实验结果表明缩比环境下激光波束可以模拟出实际机场的多径效应现象,为研究进场着陆导航系统的多径效应问题探索了一条新的途径。

Feasibility analysis of laser simulation of multi-path effect of approaching landing system

To study the multi-path effect of airport approaching landing system, according to the theory of electromagnetic system in scale model, a controllable laser transmitting equipment is used to simulate the function of the angle navigation antenna of airport approaching landing system based on the feature of the laser beam, which emits well directional laser scanning signal. The feasibility of this method were analyzed in wave similarity, reflex point coordinates similarity, signal arrival time similarity in time axis, model of laser obstacles, scattering characteristics, and phase accuracy similarity. Experimental results show that the laser beam can simulate the multipath effect of real airport in scaled environment, which provides a new way for studying the multipath effect of landing navigation system.