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针对机场起伏地形对仪表着陆系统性能的影响,提出了一种应用地形多劈模型的系统下滑道仿真评估方法.该方法应用一致性几何绕射理论建立仪表着陆系统下滑信标传播的基本模型,采用一种扫描搜索算法对地形多劈模型进行射线寻迹并得到受非理想地形影响所形成的空间复合场,所使用的扫描搜索算法能根据所考虑阶数射线的贡献来分析和评估起伏地形对仪表着陆系统影响的可接受程度.应用该方法对实际环境中的仪表着陆系统下滑道进行评估,结果表明该方法能准确、有效地预测起伏地形对仪表着陆系统下滑道造成的影响,而在考虑更高阶数射线的影响时,预测结果更为接近飞行检验结果.
Aiming at the influence of undulating terrain on the performance of instrument landing system, a method of system downgrade simulation evaluation based on multi-split terrain model is proposed. The method uses the consistent geometry diffraction theory to establish the basic model of gliding beacon propagation in the landing system of instrument, A scanning search algorithm is used to ray tracing terrain multi-split models and to obtain spatial composite fields that are affected by non-ideal terrains. The scanning search algorithm used can be used to analyze and evaluate the relief topography based on the contribution of rays of order considered This method is used to evaluate the glide path of instrument landing system in real environment. The results show that this method can accurately and effectively predict the impact of undulating terrain on glide slope of instrument landing system, When considering the effect of higher order rays, the prediction results are closer to the flight test results.