地形对仪表着陆系统下滑道影响的仿真评估  

A Fast Terrain Evaluation Method for Instrument Landing System

作　　者：吴华新[1] 赵修斌[1] 陈校平[1] 刘勇[2] 

机构地区：[1]空军工程大学电讯工程学院 [2]中国人民解放军95168部队

出　　处：《计算机测量与控制》2012年第6期1610-1612,1621,共4页Computer Measurement &Control

基　　金：陕西省自然科学基金资助项目(SJ08F06);空军工程大学研究生科技创新专项计划(Dx2010303)

摘　　要：通过飞行检验对仪表着陆系统下滑道进行评估的方法历时较长,且耗资巨大;为实现经济、快速的仪表着陆系统下滑道评估,提出一种应用计算机仿真分析非理想地形对仪表着陆系统下滑道影响的方法。建立了非理想地形的数学模型,结合仪表着陆系统下滑道形成原理,基于一致性几何绕射理论(UTD),建立了非理想地形所造成的多径效应模型,通过对下滑信号的多径射线寻迹和计算,并结合接收误差模型,实现对仪表着陆系统地形的仿真评估;应用该方法对某实际机场地形情况下,飞机在300米的高度沿跑道中线等高飞行进行仿真评估,结果表明,使用仿真评估方法可以得到与飞行检验一致的结果,从而实现地形对仪表着陆系统下滑道影响的快速评估。Flight inspections for Instrument Landing Systems （ILS） to evaluate airport terrain is a time consuming and costly project. A faster and more economic method for evaluating ILS performance under nonideal terrain condition, which utilizes computer simulation to analyze the site effect, is proposed. Math model for nonideal terrain is established. Multipath effect, which is caused by nonideal terrain, is mod- eled based on the principle of ILS glide slope and the Uniform Theory of Diffraction （UTD）. Simulation evaluation for terrain effect, which incorporates receiving error model, is realized by raytracing the glide slope signal and field computation. Application of the simulation evaluation method is performed on in airport site, when the flight path is set 300 meters above the runway centerline. Results show that using the simulation evaluation method can get result which is in accord with flight inspection, thus fast terrain evaluation for ILS glide slope is achieved.

关 键 词：仪表着陆系统 下滑道 多径效应 评估方法 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]