全视差全息体视战场沙盘的全息单元调控特性及打印方法研究

The holographic element (Hogel) based full-parallax holographic-stereo (HS) sandbox has very important prospect in military field. However, there are some difficulties existed in the researches. For example, there are not effective fusion and sampling method for the large scale complex multi-source heterogeneous battlefield scene yet, and the studies of regulation model for Hogel is mainly focused on geometrical optics, and the Hogel based HS suffers from some disadvantages, such as convergence-accommodation conflict, relatively low resolution, and so on. The investigations on the regulating characteristics and mechanism of Hogel is imperfect, and there is still no effective theory and method for the design and printing of Hogel. This project will study the fusion and sampling method for large scale multi-source heterogeneous battlefield scene, and use the angular-frequency analysis to establish the transfer-function model of Hogel and reveal the mechanism of angular-frequency regulation. The phase regulating characteristics of Hogel will also be studied, and the Hogel with regulating-matched angular-frequency and distance will be invented to eliminate the convergence-accommodation conflict effect. According to the established regulation model, some new approaches, such as novel pupil function and soft-tilted method for Hogel, are proposed to enhance the resolution of HS and eliminate the border-diffraction effect of Hogel. The optimized design method of Hogel will be built up, and the composite-sampling of Hogel will be investigated to print the HS in one-step exposure. The experimental verification will also be implemented. Thereby, with the regulating model and optimization design method of Hogel constructed in this project, theoretical and experimental supports will be provided for the analysis, design, optimization and construction of HS based battlefield sandbox.

利用全息单元方法构建的全视差战场全息体视沙盘在军事领域具有重要应用前景。但是目前对用于构建全息体视沙盘的大规模复杂多源异构光场的融合与采样尚无有效方法，全息单元的调控模型分析仅限于几何光学，且存在会聚-调节矛盾、显示分辨率不够高等显著问题，对于全息单元的调控特性和机理研究尚不完善，对全息单元的优化设计与高效激光写入尚无有效方法。本项目主要研究大规模多源异构光场的融合采样方法，建立全息单元的角谱分析和传递函数模型，研究其角谱调控和相位调控特性，建立具有角谱-距离匹配调控能力的全息单元，消除会聚-调节矛盾；提出异型光瞳及软交叠的全息单元来消除边界衍射效应，给出全息单元优化设计方法，利用全息单元复合采样实现一步全息体视图写入，并进行相关实验验证。本项目研究的全息单元调控理论和优化设计及写入方法，对战场全息体视沙盘系统的分析、优化和构建提供理论与实验支撑。

三维的立体全息体视地图在信息化战争的决策、指挥、控制和作战中具有重要军事应用。但目前尚无有效的战场全息体视地图构建方法，而且对全息体视地图的光场调控理论和特性研究也不深入和全面。本项目针对全息体视图的构建方法和光场调控特性，研究非同源异构光场采样和融合，实现光场像素的映射变换与分割重组，为全息体视图提供所需光场信息；建立全息体视的有像差衍射受限广义全息成像模型，揭示其光场调控机理，并通过视角跳变平滑和视分辨率改善提高全息再现性能；通过优化全息单元构型、采用多参考面、利用全息单元空间复用等方法实现全息体视图再现性能的改善。项目研究的全息体图的EPISM写入方法及其光场调控理论，可指导全息体视战场地图的设计构建和性能优化。