Simulation And Realization Of The Ocean Infrared Scene

As an intermediate between scientific theory and real field experiment, the simulation of large-scale Infrared sea, which integrates computer graphics, mathematics, and physics uses CPU and GPU of the computer to calculate and render the dynamic ocean scene that can provide users high sense of reality and high real-time performance. This technology not only to overcome the difficulties in the process of infrared image acquisition, but also to simulate the sea battle scenes and exercise and evaluate weapons delivery, which is an important part of measuring the comprehensive strength of China ’s military. In this paper the structure and simulation process of virtual infrared sea battlefield is major studied. The author’s major contributions are outlined as follows:1. The establishment of the sea wave model have been studied. Firstly, according to the comparison of four kinds of common modeling methods of the waves, we choose to combine wave spectrum with the geometric model to construct the height function of the sea surface. On the option of the wave spectrum, Pierson-Moscowitz is used as the frequency spectrum, ITTC(International Conference on ship model basin) as the direction spectrum. Linear superposition of the Gerstner model is used in the geometric model. What’s more, Perlin noise function is introduced to make disturbance of the large scale sea. Using all these methods, we can get a realization of the random fluctuation of sea surface.2. The infrared radiation characteristics of the sea surface have been studied. Firstly, The radiation energy the detector received can be divided into two aspects, spontaneous emission of the infrared sea and reflection of sea surface to ambient light source. Then, the calculation method of spontaneous emission of the sea surface and emission rate model is established. The environment light source consists of the sky background radiation and strong light source. In the next, the radiation characteristics and light calculation model of environment light source separately introduced. At last, a detailed analysis of the Ross model which is one of the bidirectional reflectance distribution function that suitable for rough surface reflection is carried out. The Ross model is an expression of the relationship between and the light source the detector. Based on this model, the illumination rendering part of the sea scene is designed.3. The strong light weapons in the infrared sea surface have been studied. Infrared decoy is a kind of common interference arms, often appear around the planes and ships, interfering infrared detector on the detection of the target. Firstly, the interference mechanism infrared decoy is proposed. Then according to the characteristics of decoys, a three-dimensional model and effects of decoys is created by particle system and billboard technology, in the next the analysis of infrared radiation feature of decoys is discussed.4. The special effects of the infrared sea battlefield has been studied. According to the shell explosion on the sea surface, the explosive column is analyzed which contain the shape and movement characteristics. Using the particle system,the explosive column can be simulated.5. The system of virtual infrared ocean scene has been studied. Results and analysis of each part of the scene simulation are given out. Firstly, OGRE 3D rendering engine, Cg, a high-level Shading Language based on GPU and texture generation technology which accelerates the scene update are introduced. Then the whole framework and process of the infrared ocean battlefield scene is published. Using the related technology, the contents of this paper are given including sea-level fluctuation state under different wind speeds, sky background radiation texture, atmospheric transmittance texture, atmospheric path radiation texture, solar radiation texture between medium wave, long wave band that pre-calculated by MODTRAN, the ocean scene added a variety of atmospheric effects, a bright band on the surface caused by the reflection of strong light source, explosive water column etc. At last the simulation results are analyzed to verify the feasibility and effective of each method using in the Infrared ocean scene.