中文摘要：

考虑到机场周围障碍物对飞行安全的影响,文章提出一种基于World Wind的障碍物评估方法。该方法根据机场环境和飞行程序设计要求建立OAS面数学模型,对给定的数据进行分析计算;对World Wind进行二次开发,实现障碍物与OAS面关系的三维可视化,结合客观数据分析和三维仿真结果给出评估报告;并分析障碍物对导航信号遮蔽影响,完成对障碍物的进一步评估。通过对天津机场障碍物验证分析表明,该方法对障碍物评估计算结果与ICAO使用的专业软件结果一致,并且更便捷直观,同时通过研究障碍物对某DME台信号的遮挡影响,结果证明能够准确地计算DME信号近距有效覆盖范围。

英文摘要：

Considering the effect of obstacles on flight safety,a method of obstacles assessment based on World Wind（WW）was proposed in the paper.Firstly,according to the requirements of the airport environment and flight procedure design,the mathematical model of the Obstacle Assessment Surface（OAS）was established,and the given obstacle data was analyzed and calculated.Secondly,by developing the secondary development functions of WW,the three-dimensional visualization of the relationship between obstacles and the OAS was presented,combining with objective data analysis and three-dimensional simulation results,an assessment report was given.Finally,the effect of obstacles shielding on specified navigation station signal coverage was analyzed,and assessing to obstacles was finished further.Taking the airport of Tianjin as a case study,it was proved that the results of obstacles evaluation were consistent with the results of ICAO professional software,but were more convenient and intuitive.Moreover,through researching the influence of obstacles on DME station signal,the effective coverage could be given accurately.