Virtual Simulation Technology On Missiles Homing Phase

The virtual simulation technology on missiles homing phase is to simulated thescene of the missile terminal guidance stage. The simulation system can beconsiderded a tracking System or a detection system, and it can simulate somespecific simulation scenes for that never used to be combat simulation,like cities. Inthe field of virtual simulation, there are two important indicators to decidesimulation results of the virtual scene.One is the generation rate of virtual image,theother is the simulation results of simulation scenes.We can meet both ruquests for asimulation system with a small amount of data, but with regard to a simulationsystem with a large amount of data,things can be handled by another way. The morerealistic scenario, the slower the rendering speed. Thus, two factors should beweighed.The paper expands the research on these two indicators, and includes thesesevels aspects.In order to simulate realistic terrain in the simulation system, we generate terrainmodel by reading the DEM elevation data. At different phases of Missiles flight, weuse different terrain textures with different resolutions of real images. To avoid thephenomenon of visual jumps between adjacent resolution terrain, we use transitiontextures made by corresponding fusion strategy. This method is a realisticsimulation of missile gradual process. For satellite blind terrain, a simulation algorithm of adaptive realistic terrain generation method based on ROAM algorithmwas introduced. The terrain generated by ROAM is to be a base grid. Then wecomputer the integrated parameter Y of the lower grids. By comparison with a giventhreshold value to the Y parameters, determine whether to split or not. Extract thesharp features of the vertex that satisfy the conditions and split these vertexes withLoop algorithm. It generates a video stream by rotation mapping algorithm inreal-time roaming process and sends to the injection simulation system to the DVI.Experimental results show that: the average of roaming frame rate of proposedalgorithm is45.1303and the peak frame rate close to50. The frame rate is higherthan the average frame rate of the original algorithm. The proposed algorithmsatisfies the requirements of the injection simulation system and the average ofroaming frame rate is45.In order to improve the effectiveness of texture mapping, I propose a constrainttexture mapping method based on the evaluation value to determine which objectfunction to select. This algorithm computes evaluation value of internal vertices ofevery triangular block after the feature point’s triangulation in the parameter plane.For the triangle both the objective functions are not suitable, we conduct atriangulation iteratively and calculate the evaluation value of triangles next level.Experiments show that this algorithm is dropped an average more than75%of thetime than the classical algorithm.The model of this algorithm is loaded into thereal-time rendering system with high frame frequency. Experiments show that thealgorithm has good robustness; repeated experiments show that the proposedalgorithm can maintain good texture validity.In our virtual simulation system, the missiles fly at different positionscorresponding to different simulation scenarios.It can adjust the parameters of themissiles when the user change input data. Meanwhile, the virtual simulation scenechanges like translation, rotation or scaling.In this way, we can control the virtualsimulation scene at any time. For example, we can add some special renderingresults in any frame images. We use VC++and OPENGL finished the simulation of virtual scene. I realized the simulation of virtual scene about the missile terminalguidance stage.In order to achieve injection simulation on virtual image, I built a simulationplatform for injection.The platform includes PC、and FPGA. PC used to generate thevirtual scene, and in this process PC computer will save the virtual scene as BMPpictures by rotation mapping technology. Then, the virtual image will be sent toFPGA through PCIe. And then,the visual image will be sent to the image processingplatform of the missile. Experimental results show that the injection simulation testbased on virtual images is successful.