Research On 3D Visualization Of Aerodrome Terminal Area Obstacle Assessment

With the rapid development of civil aviation industry, the airport construction is also developed rapidly in China. At the airport siting, construction or reconstruction and expansion, due to some of airspace factors changing, for example artificial buildings are built in the airport terminal region; the factors may have impact on flight safety directly, it is necessary to assess obstacles in the terminal area. In addition, the airport obstacles are likely to block the propagation of electromagnetic waves in some orientations, and to limit the long-range target detection in some level of a large azimuth, thus to affect the aircraft flight safety. To ensure the safety of aircraft flying in the approach and departure, research of airdrome obstacles effects on the navigation signal coverage is necessary.To aim at the obstacle assessment work, four parts of the work has been done. Firstly, for the obstacle assessment links of the flight procedures design, a detailed analysis of obstacle assessment methods and procedures is given, and the obstacle assessment software is designed. Secondly, to compensate the lack of the two-dimensional obstacle assessment methods or building sand table model for the obstacles assessment at present, the three-dimensional model database of the obstacle is established, to prepare the needs of 3D visualization. Thirdly, for the effect that obstacles of the airport terminal area shield the navigation signal on flight safety is analyzed and computed in-depth. Finally, the airport obstacle assessment of 3D visualization simulation is achieved based on World Wind platform.Through simulating and verifying to the obstacle data of Tianjin Binhai airport, the results show that the platform is capable of calculating and analyzing independently and accurately whether obstacles exceed the specified height or not, and it is more convenient and intuitive. Meanwhile, according to the actual obstacle data, the effective coverage of DME is more precisely calculated, and the simulation is accomplished on World Wind platform. The method provides support and experimental platform for the obstacle assessment work.