Opengl-based Virtual Simulation Of The Flight Environment

Aircraft-environment simulation is an important part of UAV system. It simulates the outside landscape and pose of UAV, which uses graphics technology and provides vivid picture for ground controller. It also could be applied to training simulators or engineering simulators.This paper is one part of the "973" project-"human-machine interface and real-time visualization of UAV", which mainly studies the key technologies of displaying aircraft in high altitude. The design and implementation of the software system model for the aircraft-environment simulation are fulfilled. Overall, four important parts of the paper are as follows:Firstly, some fundamental theory is described, including the virtual simulation technology and some concept of UAV system. In addition, the purpose and the task of this research are mentioned.Secondly, the development tool, OpenGL, is introduced, focusing on some of its key technologies.Thirdly, two important problems, 3D modeling and the relation of aircraft pose with visual angle, are specifically anglicized. As for the 3D modeling, the respondent modeling method is anglicized according to the characteristics of various sceneries. The simplicity of drawing method is proposed by combine the method of displaying list, terrain segmentation and vertex removing, which fulfilled the real-time display of a great scale terrain. As to the second problem, the quantitative relationship of view body and visual angle is deducted based on the theory of mathematics, which resolves the problem of aircraft pose display with better visual effect in simulation.These display the author's creative works.Finally, the integrated procedure of designing the 3D aircraft-environment virtual simulation system is introduced. The realization of software and the concrete flowdiagram are provided. And conclusions about various optimized measurements are drawn. Meanwhile, a kind of fast simple aircraft-environment simulation system, an aircraft-environment simulation system based on 2D terrain, is put forward, considering the condition that the direction of viewpoint is vertical to the ground.The study is done based on the platform of Visual C++ 6.0 and the usage of OpenGL library. In order to improve the performance of the system, diverse measures are taken when it is put into realization, which increases frame rate by more than 4 times under the same condition, and it ultimately could reach to 60 fps. The results of the study shows tha this thesis is somewhat advanced.