Simulation Of Celestial Scene In Shiphandling Simulator Based On Platform Of OpenGL

The simulation of celestial scene has been the key problem of flight simulator and automation of astronavigation. The modeling of celestial scene has great value in aeronautics, aviation, remote sensing, and navigation. The use of celestial scene in Shiphandling Simulator can greatly improve the fidelity of 3D scene.Therefore, the key task of the research is to compute the position of the celestial bodies and the real-time rendering of the celestial scene. The primary research contents and contributions of this dissertation summarized here are:Based on FK5 ephemeris, the paper presented an approach for modeling and simulating the celestial scene in the Shiphandling Simulator. The basic idea of the method is that the coordinates of the celestial bodies in the 2nd Coordinates of Equinoctial System was calculated by the mathematics model which took the system time and the position of observer as the parameter that was obtained dynamically. Then, with a series of coordinates conversion, the star position is converted into the observation coordinate.The celestial scene is rendered by the OpenGL function, which is based upon the observation coordinate. It is determined the phase of moon that the relative position between sun and moon. Consequently the celestial scene can be rendered dynamically by using the modeling result. Finally a real-time program of celestial bodies in navigation visual simulation system was built which adopted OpenGVS codes.Based on the above technologies, the observation of celestial bodies altitude by sextant is simulated. Then the position of observer can be computed by the altitude.It is proved that the method can meet the real-time requirement in the Shiphandling Simulator.