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首页> 外文会议>International symposium on photoelectronic detection and imaging;ISPDI 2011 >Simulation of Space-based Visible Surveillance Images for Space Surveillance
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Simulation of Space-based Visible Surveillance Images for Space Surveillance

机译：基于空间可视监视图像的空间监视仿真

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The simulation of space-based visible surveillance images can offer technical support to the index argumentation, scheme design and ground-tests of spatial optical system. Based on the analysis of the space-based visible surveillance principle, this paper establishes the simulation framework of space-based visible surveillance images, as well as its workflow, and simulates the images of the celestial background and space objects respectively with OpenGL. Firstly, concerning its visual features, the celestial background can be divided into point objects and surface objects. The rendering methods based on OpenGL for both objects are given and the basic space background rendering workflow is also established. The 14-magnitude stars are rendered in the simulation of celestial background which can satisfy the need of the space-based visible surveillance. Secondly, this paper calculates the orbital elements of the objects through utilizing TLE data and SGP4/SDP4 model and obtains the positions of them in the CCD through coordinate transformation. Simultaneously, the brightness model is built up in combination with the distribution features of the space objects' surface and the simulation of the space objects' images is realized with the attainment of the brightness in the CCD through greyscale conversion. Finally, the space-based visible surveillance images are generated by overlapping the star background and the objects' images. The fidelity of the simulation images is almost identical to the images which are obtained by the SBV camera, which convincingly proves that the proposed rendering method can effectively simulate the celestial background and the target images when observed with space-based visible camera.
机译：天基可见监视图像的仿真可以为空间光学系统的指标论证，方案设计和地面试验提供技术支持。在分析天基可见监视原理的基础上，建立了天基可见监视图像的仿真框架及其工作流程，并利用OpenGL分别对天体背景图像和空间物体图像进行了仿真。首先，就其视觉特征而言，天体背景可分为点对象和表面对象。给出了基于OpenGL的两个对象的渲染方法，并建立了基本的空间背景渲染工作流程。在模拟天体背景的过程中渲染了14颗恒星，可以满足天基可见监视的需求。其次，利用TLE数据和SGP4 / SDP4模型计算目标的轨道要素，并通过坐标变换获得其在CCD中的位置。同时，结合空间物体表面的分布特征建立了亮度模型，并通过灰度转换获得了CCD中的亮度，从而实现了空间物体图像的仿真。最后，通过重叠恒星背景和物体图像生成天基可见监视图像。仿真图像的保真度几乎与SBV相机获得的图像相同，这令人信服地证明了所提出的渲染方法可以有效地模拟天基背景和目标图像，而这些图像是基于太空的可见光相机观察到的。

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