Study On The Multi-Spectral Simulation System For Flying Targets

Virtual simulation has been a hotspot in Computer Graphics. It simulates all kinds of mutative scenes using the latest computer graphics technologies and plays a decisive role in the military and aerospace fields of training and simulation or in the design and test of weapon system. And the imaging simulation of multi-spectral wave band (including visible and infrared and so on) can make up the weak imaging quality in bad weather conditions such as at night and in the cloud or fog for visible imaging simulation. That will supply a new intuitionistic and efficient method for the design and drilling of composite homing guidance system. We will focus on the research of a multi-spectral simulation system for flying targets.In Chapter One, we first introduce virtual simulation and the significance of multi-spectral imaging simulation. Then we present the research works of virtual simulation in the country or on the board now. The main research works of this paper are presented at last.In Chapter Two, we discuss the multi-spectral modeling and real-time rendering technologies for aerial targets. We first introduce the visible geometry modeling. Then we discuss the infrared modeling and rendering for targets in detail. Because the complexity of the existing model of radiation from inner heat source and aerodynamic heating effect on the outside surfaces is very high so that we can't render the targets quickly, we present a novel method similar with key-frame animation of real-time rendering by pre-computation to implement the real-time rendering of infrared dynamic effect for inner heat source and aerodynamic heating effect. We last implement the visible and infrared modeling and real-time rendering of trail flame using particle system.The quick creation of realistic multi-spectral background is an important part in real-time creation of multi-spectral scenes. In Chapter Three, we first discuss the method of creating multi-spectral star and space scenes based on the chronometer star table and cloud scenes based on Vega modules. Then we introduce the method ofcreating multi-resolution terrain texture scenes using texture quad-tree. Last we present a new method of creating infrared terrain scenes in which we first adopt a region segmentation algorithm for visible images based on classifying the heat database, and then we adopt an intelligent scissors algorithm to take the segmentation and mixing of regions easily for which users select difficultly such as glass, trees , bricks, roads and so on, and we last create the terrain scenes under infrared wave band using the material temperature computing method of infrared heat modules.In Chapter Four we introduce the building of the whole simulation system. First we discuss the modeling and rendering of multi-spectral decoy projectile. Second we introduce the building of air targets database. Third we introduce the scheduling of background data and implementation of real-time rendering. The function of taking video and playing back for multi-viewpoint dynamic courses is presented at last, it can facilitate the simulation analysis for users.At the end of the dissertation, the author sums up research works in this paper, and give the direction of following research.